Platinum-based ceramic filter tube catalysts, methods of making and using the same

Abstract

This invention relates to the field of synergistic treatment of industrial flue gas dust and multiple pollutants, specifically to platinum-based ceramic filter catalysts, their preparation methods, and applications. A platinum-based ceramic filter catalyst is characterized by comprising: a ceramic filter substrate; and a catalytic coating located on at least a portion of the surface of the ceramic filter substrate. The raw material for the catalytic coating includes a platinum-based catalytic slurry, comprising nano-titanium dioxide, soluble Pt salt, sol, dispersant, and water. By combining the catalytic slurry with the ceramic filter substrate, a reaction interface integrating dust removal and CO / VOC oxidation is constructed, avoiding the poisoning of downstream catalysts by dust in traditional processes, thus improving catalyst stability and reducing pressure drop. Simultaneously, it provides sufficient residence time and contact area for the catalytic reaction, significantly improving catalytic efficiency.

Description

Technical Field

[0001] This invention relates to the field of synergistic treatment of industrial flue gas dust and multiple pollutants, specifically to platinum (Pt)-based ceramic filter catalysts, their preparation methods, and applications. Background Technology

[0002] GB 31571-2015, GB 13223-2011, and their 2023 draft revision have included particulate matter, SO2, and NO. x The special emission limits for CO and non-methane hydrocarbons (NMHC) have been tightened to ≤10 mg / m³, ≤35 mg / m³, ≤50 mg / m³, ≤100 mg / m³, and ≤20 mg / m³, respectively. Meanwhile, the CO concentration in the exhaust gases from petrochemical, steel, coking, and waste incineration plants is typically 200–3000 mg / m³, while VOCs, mainly toluene, xylene, and low-carbon alkanes and olefins, are typically 50–1500 mg / m³.

[0003] The traditional segmented process of "SCR denitrification + CO oxidation + VOCs catalytic combustion" is not only long and occupies a large area, but also requires a flue gas reheater because each unit has different requirements for temperature, space velocity, oxygen content and other conditions. This results in high system pressure drop, high energy consumption, large carbon emissions and significantly increased costs.

[0004] Currently, coal-fired power plants generally employ either a process of dust removal followed by desulfurization and denitrification, or pollutant removal followed by dust removal. The former, lacking low-temperature, high-efficiency catalysts, requires reheating the flue gas to 300-400°C for reaction, resulting in high energy consumption; the latter easily leads to dust clogging of catalyst pores and active sites, causing a rapid increase in pressure drop and a decrease in purification efficiency. Although there have been attempts at multifunctional integrated catalysts, they generally struggle to simultaneously achieve efficient oxidation of SCR, CO, and VOCs.

[0005] For example, the V2O5-WO3 / TiO2 denitration catalyst performs excellently at 300~400℃, but has low activity for VOCs oxidation; conventional Pt / Al2O3 and Pd / Al2O3 catalysts have low ignition temperatures for CO and VOCs (T2). 50 While catalysts have an activity range of approximately 180–220 °C, they lack SCR activity, requiring additional catalytic units to achieve efficient synergistic catalytic oxidation of SCR, CO, and VOCs. Transition metal oxides (Co3O4-CeO2, MnOx-FeOx, etc.) can simultaneously oxidize CO and some VOCs at 200–350 °C, but they suffer from narrow activity temperature windows, poor resistance to sulfur and water poisoning, easy deactivation to chlorine- and sulfur-containing VOCs (such as dichloromethane and thiophene), the ability to oxidize only some VOCs, and difficulty in removing more difficult-to-oxidize VOCs such as toluene. Furthermore, the catalyst powder has low mechanical strength, making it difficult to directly coat the honeycomb carrier, and the manufacturing process is complex, hindering industrial scale-up. Summary of the Invention

[0006] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention provides a platinum-based ceramic filter catalyst, its preparation method, and its application. The preparation process is simple, and it can achieve highly efficient synergistic catalytic removal of CO and toluene at 180–350 °C, while exhibiting good water and sulfur resistance.

[0007] A first aspect of the present invention provides a platinum-based ceramic filter catalyst, comprising:

[0008] Ceramic filter tube substrate; A catalytic coating, said catalytic coating being located on at least a portion of the surface of the ceramic filter substrate; The raw materials for the catalytic coating include a platinum-based catalytic slurry, which comprises nano-titanium dioxide (nano-TiO2), soluble Pt salt, sol, dispersant, and water.

[0009] By adopting the above technical solution, a reaction interface integrating physical interception (dust removal) and chemical conversion (CO / VOCs oxidation) can be constructed by combining the catalytic slurry with the ceramic filter tube matrix. This avoids the poisoning of downstream catalysts by dust in traditional processes and is conducive to improving the stability of the catalyst. At the same time, the structural advantages of the filter tube itself can be utilized to provide sufficient residence time and contact area for the catalytic reaction, significantly improving catalytic efficiency and reducing pressure drop.

[0010] It should be noted that the platinum-based catalytic slurry with nano-TiO2 as the support and soluble Pt salt as the active component must contain sol and dispersant to ensure high adhesion, high dispersion, crack resistance, and non-detachment of the catalytic coating on the ceramic filter substrate surface. This effectively improves the catalyst's resistance to sulfur and water poisoning, mechanical strength, and qualitative properties; lowers the catalyst's activity temperature, increases the activity temperature window range, and significantly reduces energy consumption; and synergistically removes VOCs such as CO and toluene, which is beneficial for achieving long-term stable operation of the platinum-based ceramic filter catalyst.

[0011] According to an embodiment of the present invention, the content of soluble Pt salt in the platinum-based catalytic slurry is 0.5~1.5 wt% of nano-TiO2.

[0012] According to an embodiment of the present invention, the solid content in the platinum-based catalytic slurry is 10~30 wt%.

[0013] According to an embodiment of the present invention, the soluble Pt salt includes one or more of platinum nitrate (Pt(NO3)4), chloroplatinic acid (H2PtCl6), ammonium chloroplatinate ((NH4)2PtCl6), sodium chloroplatinate (Na2PtCl6), platinum acetate (Pt(CH3COO)4), dichlorodiammineplatinum (Pt(NH3)2Cl2), tetraammineplatinum nitrate (Pt(NH3)4(NO3)2), and tetraammineplatinum chloride (Pt(NH3)4Cl2), preferably platinum nitrate.

[0014] According to an embodiment of the present invention, the particle size of the nano-titanium dioxide is 30~150nm.

[0015] According to an embodiment of the present invention, the crystal phase of the nano-titanium dioxide is anatase.

[0016] According to an embodiment of the present invention, the sol includes at least one of silica sol and aluminum sol.

[0017] According to an embodiment of the present invention, the dispersant includes one or more of polyethylene glycol, polypropylene glycol, and polyether block copolymers.

[0018] According to an embodiment of the present invention, the polyether block copolymer includes at least one of F127 and P123.

[0019] According to an embodiment of the present invention, the weight-average molecular weight of the dispersant is 200-600.

[0020] According to an embodiment of the present invention, the platinum-based catalytic slurry further includes an additive; further, the additive includes at least one of a nitrate or ammonium salt of a 3d transition metal.

[0021] According to an embodiment of the present invention, the 3d transition metal includes one or more of Mo, Cu, and Co.

[0022] According to an embodiment of the present invention, the content of the additive in the platinum-based catalytic slurry is 3-5 wt% of nano-TiO2.

[0023] According to an embodiment of the present invention, the loading amount of the catalytic coating on the ceramic filter substrate is 10~20 wt%.

[0024] According to an embodiment of the present invention, the specific surface area of ​​the ceramic filter tube substrate is 10~15 m². 2 / g.

[0025] A second aspect of the present invention provides a method for preparing the aforementioned platinum-based ceramic filter catalyst, comprising: Nano-titanium dioxide, soluble Pt salt, sol, dispersant and water are mixed to obtain a platinum-based catalytic slurry; The platinum-based catalytic slurry was coated onto the surface of a ceramic filter substrate, dried, and calcined to obtain a platinum-based ceramic filter catalyst.

[0026] By adopting the above technical solution, a reaction interface integrating physical interception (dust removal) and chemical conversion (CO / VOCs oxidation) can be constructed by combining the catalytic slurry with the ceramic filter substrate. This avoids the poisoning of downstream catalysts by dust in traditional processes and is beneficial to improving catalyst stability. Simultaneously, the structural advantages of the filter itself provide sufficient residence time and contact area for the catalytic reaction, significantly improving catalytic efficiency. The process is simple and easy to promote and apply. Furthermore, it ensures high adhesion, high dispersion, crack resistance, and non-detachment of the catalytic coating on the ceramic filter substrate surface, effectively improving the catalyst's resistance to sulfur and water poisoning, mechanical strength, and stability, lowering the catalyst's activity temperature, increasing the activity temperature window range, and significantly reducing energy consumption. It also synergistically removes VOCs such as CO and toluene, facilitating the long-term stable operation of platinum-based ceramic filter catalysts. The preparation process is simple and conducive to large-scale application.

[0027] According to an embodiment of the present invention, the coating rate is 0.05~0.1 m / s.

[0028] According to an embodiment of the present invention, the coating is applied 2 to 4 times.

[0029] According to an embodiment of the present invention, the drying temperature is 100~120 ℃ and the drying time is 2~4 h.

[0030] According to an embodiment of the present invention, the calcination temperature is 300~500 ℃ and the calcination time is 2~4 h.

[0031] According to an embodiment of the present invention, the heating rate of the calcination is 2~10 °C / min.

[0032] In some embodiments, the preparation method of the platinum-based ceramic filter catalyst further includes drying the ceramic filter substrate before coating.

[0033] A third aspect of the present invention provides the application of the aforementioned platinum-based ceramic filter catalyst in the synergistic removal of CO and VOCs.

[0034] By adopting the above technical solution, two pollutants can be simultaneously oxidized in the same catalytic system, simplifying the process flow, eliminating multiple independent reactors and connecting pipelines, and significantly reducing costs. CO oxidation is a strongly exothermic reaction, and the released heat can raise the temperature of the catalytic bed in situ, promoting the catalytic combustion of VOCs, reducing external heating energy consumption, and achieving energy coupling utilization. A single catalyst acts on two reactants simultaneously, reducing the types and amounts of catalysts used, improving the utilization efficiency of the precious metal Pt, and making operation and maintenance more convenient. In addition, synergistic removal avoids the problem of temperature window mismatch between units in segmented treatment, achieving efficient conversion of both pollutants in the low-temperature range of 180~250℃ without the need for flue gas reheating, further reducing system energy consumption and carbon emissions, and meeting the environmental protection requirements for pollution reduction and carbon reduction.

[0035] According to an embodiment of the present invention, the VOCs include at least one of benzene, toluene, xylene, formaldehyde, trichloroethylene, and tetrachloroethylene, preferably toluene.

[0036] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0037] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a SEM image of the platinum-based catalyst slurry after drying in Example 1 of the present invention, wherein... Figure 1 (a) and Figure 1 (b) is its SEM image at the 50nm scale. Figure 1 (c) is its SEM image at the 20nm scale. Figure 1 (d) is its SEM image at the 20nm scale; Figure 2 This is an EDS distribution diagram of catalyst A of the present invention, wherein, Figure 2 (a) is the EDS superposition distribution diagram of O, Ti, and Pt elements in catalyst A. Figure 2 (b) is the EDS distribution diagram of O element in catalyst A. Figure 2 (c) is the EDS distribution diagram of Ti element in catalyst A. Figure 2 (d) is the EDS distribution diagram of Pt element in catalyst A; Figure 3 These are the XPS spectra of catalysts A to D of the present invention, wherein... Figure 3 (a) is the XPS spectrum of O 1s in catalysts A~D. Figure 3 (b) shows the XPS spectra of Ti 2p in catalysts A~D. Figure 3(c) shows the XPS spectra of Pt 4f in catalysts A~D; Figure 4 The curves showing the CO conversion rate as a function of temperature in the co-catalytic oxidation test of CO and toluene using catalysts A~G of the present invention are shown. Figure 5 The curves showing the toluene conversion rate as a function of temperature in the co-catalytic oxidation test of CO and toluene using catalysts A~G of the present invention are shown. Figure 6 The curves showing the CO conversion rate over time in the water and sulfur resistance performance test of catalysts A and F of the present invention are shown. Detailed Implementation

[0038] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0039] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0040] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0041] In this document, the terms “comprising” or “including” are open-ended expressions, meaning that they include the contents specified in this invention, but do not exclude other aspects.

[0042] In this document, the terms “optionally,” “optionally,” or “optionally” generally refer to an event or condition that may, but may not, occur, and the description includes both cases in which the event or condition occurs and cases in which the event or condition does not occur.

[0043] A first aspect of the present invention provides a platinum-based ceramic filter catalyst, comprising: Ceramic filter tube substrate; A catalytic coating, said catalytic coating being located on at least a portion of the surface of the ceramic filter substrate; The raw materials for the catalytic coating include a platinum-based catalytic slurry, which comprises nano-titanium dioxide (nano-TiO2), soluble Pt salt, sol, dispersant, and water.

[0044] By adopting the above technical solution, a reaction interface integrating physical interception (dust removal) and chemical conversion (CO / VOCs oxidation) can be constructed by combining the catalytic slurry with the ceramic filter tube matrix. This avoids the poisoning of downstream catalysts by dust in traditional processes and is conducive to improving the stability of the catalyst. At the same time, the structural advantages of the filter tube itself can be utilized to provide sufficient residence time and contact area for the catalytic reaction, significantly improving catalytic efficiency and reducing pressure drop.

[0045] It should be noted that the platinum-based catalytic slurry with nano-TiO2 as the support and soluble Pt salt as the active component must contain sol and dispersant to ensure high adhesion, high dispersion, crack resistance, and non-detachment of the catalytic coating on the ceramic filter substrate surface. This effectively improves the catalyst's resistance to sulfur and water poisoning, mechanical strength, and qualitative properties; lowers the catalyst's activity temperature, increases the activity temperature window range, and significantly reduces energy consumption; and synergistically removes VOCs such as CO and toluene, which is beneficial for achieving long-term stable operation of the platinum-based ceramic filter catalyst.

[0046] According to an embodiment of the present invention, the content of soluble Pt salt in the platinum-based catalytic slurry is 0.5~1.5wt% of nano-TiO2, specifically such as 0.5wt%, 0.7wt%, 1.0wt%, 1.2wt%, 1.5wt%, etc.

[0047] This approach enables high dispersion of Pt and maximizes atom utilization, thereby improving catalytic activity and increasing the conversion rates of CO and toluene. However, if the content is too low, insufficient Pt active sites may result in decreased CO and toluene conversion rates, making it difficult to meet emission standards. Simultaneously, the interaction between the catalyst layer and the support is weak, leading to poor thermal stability. Conversely, if the content is too high, the interparticle spacing of Pt may decrease, causing easy agglomeration during high-temperature calcination, reducing dispersion and specific activity, and drastically increasing costs. Excessive Pt may also over-catalyze side reactions, increasing CO2 selectivity and hindering the synergistic removal of CO and VOCs.

[0048] According to an embodiment of the present invention, the solid content in the platinum-based catalyst slurry is 10~30 wt%, specifically 10wt%, 15wt%, 20wt%, 25wt%, and 30wt%.

[0049] This allows the slurry to be in a shear-thinned state, possessing both good coating leveling properties and the ability to achieve the target thickness in a single coating, resulting in a dense, uniform, and defect-free catalyst layer after drying. If the solid content is too low, the slurry viscosity may be low and the fluidity may be too strong, easily causing sagging and uneven thickness during coating, requiring multiple coatings to achieve the target load, resulting in low production efficiency. If the solid content is too high, the slurry viscosity may be too high, resulting in poor fluidity, difficulty in uniform spreading, and easy formation of defects such as bubbles and cracks. Furthermore, the increased drying shrinkage stress can lead to cracking and peeling of the catalyst layer.

[0050] It should be noted that the solid content refers to the percentage of the sum of the masses of all solid raw materials in the platinum-based catalytic slurry relative to the total mass of the platinum-based catalytic slurry; for example, the solid raw materials include nano-titanium dioxide, soluble Pt salts, sols, etc.

[0051] According to an embodiment of the present invention, the soluble Pt salt includes one or more of platinum nitrate (Pt(NO3)4), chloroplatinic acid (H2PtCl6), ammonium chloroplatinate ((NH4)2PtCl6), sodium chloroplatinate (Na2PtCl6), platinum acetate (Pt(CH3COO)4), dichlorodiammineplatinum (Pt(NH3)2Cl2), tetraammineplatinum nitrate (Pt(NH3)4(NO3)2), and tetraammineplatinum chloride (Pt(NH3)4Cl2), preferably platinum nitrate.

[0052] According to an embodiment of the present invention, the particle size of the nano-titanium dioxide is 30~150nm, specifically 30nm, 40nm, 50nm, 60nm, 80nm, 100nm, 120nm, 150nm, etc. Therefore, the smaller particle size can significantly increase the specific surface area, providing more surface active sites for loading Pt nanoparticles, thereby improving the dispersion and atom utilization of the noble metal, reducing catalyst costs; and shortening the reactant diffusion path, reducing internal diffusion resistance, making it easier for CO and VOCs molecules to contact the Pt active sites, increasing the reaction rate; and ensuring that the catalytic slurry has good suspension stability and rheological properties, facilitating uniform coating on the surface of the ceramic filter substrate to form a dense and crack-free catalytic layer, improving the coating bonding strength and long-term stability of the catalyst.

[0053] According to an embodiment of the present invention, the crystal phase of the nano-titanium dioxide is anatase.

[0054] By adopting the above technical solution, its crystal structure is tetragonal, with many defects and oxygen vacancies in the lattice, which is conducive to the high dispersion of the active component Pt and inhibits the sintering and growth of Pt particles, thereby maintaining high catalytic activity. The high density of surface hydroxyl groups is beneficial to enhancing the adsorption and activation capacity of CO and VOCs and reducing the reaction activation energy. At the same time, the metal-support interaction (SMSI) between anatase titanium dioxide and Pt is moderate, which can stabilize Pt nanoparticles without over-encapsulating active sites, which is conducive to the efficient oxidation of CO and toluene in a lower temperature range. Its surface acidic site distribution is suitable, and it exhibits good anti-poisoning performance against sulfur-containing and water-containing flue gas, which can delay the poisoning effect of SO2 and H2O on Pt active sites and extend the catalyst life.

[0055] According to an embodiment of the present invention, the sol includes at least one of silica sol and aluminum sol.

[0056] By adopting the above technical solutions, nano-SiO2 particles in silica sol or nano-Al2O3 particles in alumina sol can form a dense inorganic network structure on the surface of the ceramic filter tube substrate, firmly bonding the Pt active component, titanium dioxide carrier, and additives to the substrate surface, significantly improving the mechanical strength and long-term stability of the catalyst layer. The sol system has good chemical compatibility with the ceramic substrate, and after high-temperature calcination, it can form chemical bonds or sintering necks, enhancing the interfacial bonding force and avoiding coating cracking or peeling caused by thermal expansion coefficient mismatch during thermal cycling. Both silica sol and alumina sol are water-based systems, environmentally friendly and non-toxic. The viscosity can be adjusted after mixing with platinum-based catalyst slurry, and the coating process is highly adaptable. Uniform film formation can be achieved by dipping, spraying, or brushing. Furthermore, it has a certain tolerance to sulfur and water vapor, which helps to improve the catalyst's anti-poisoning performance and long-term stability.

[0057] According to an embodiment of the present invention, the dispersant includes one or more of polyethylene glycol, polypropylene glycol, and polyether block copolymers.

[0058] According to an embodiment of the present invention, the polyether block copolymer includes at least one of F127 and P123.

[0059] According to an embodiment of the present invention, the weight-average molecular weight of the dispersant is 200-600, specifically 200, 250, 300, 350, 400, 450, 500, 550, 600, etc.

[0060] This allows for the formation of a sufficiently thick adsorption layer between particles, providing effective electrostatic stability and steric hindrance to ensure long-term stable dispersion of the slurry. Simultaneously, it maintains suitable rheological properties, facilitating uniform coating and film formation. If the molecular weight is too low, the dispersant chain length may be insufficient, resulting in a weak steric hindrance effect and difficulty in effectively stabilizing the nanoparticles. This can lead to the aggregation and sedimentation of components such as Pt and titanium dioxide in the slurry, resulting in poor coating uniformity. Conversely, if the molecular weight is too high, the slurry viscosity may be excessive, reducing fluidity and making it difficult to spread uniformly on the ceramic filter tube surface. Furthermore, it can easily form a thick, impermeable coating, increasing filtration pressure drop.

[0061] According to an embodiment of the present invention, the platinum-based catalytic slurry further includes an additive; more specifically, the additive includes at least one of a nitrate or ammonium salt of a 3d transition metal. This facilitates enhancing the catalytic activity of the catalyst for specific VOCs by modulating the electronic structure of the catalyst.

[0062] According to an embodiment of the present invention, the 3d transition metal includes one or more of Mo, Cu, and Co. Therefore, the introduction of promoters such as Mo, Cu, and Co can further modulate the electronic structure of the catalyst, optimize the selectivity for specific VOCs (such as toluene), and further enhance the catalytic activity of the catalyst for specific VOCs.

[0063] In some embodiments, the adjuvant includes ammonium molybdate.

[0064] According to an embodiment of the present invention, the content of the additive in the platinum-based catalytic slurry is 3 to 5 wt% of nano-TiO2, specifically such as 3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, 5 wt%, etc.

[0065] Therefore, it can generate synergistic electronic and geometric effects with Pt, increasing the adsorption strength of reactants, widening the active temperature window, and enhancing the resistance to competitive adsorption of SO2 and H2O, thereby improving catalytic activity, anti-toxicity, and stability. If the content of the promoter is too low, it may lead to insufficient co-catalytic effect, making it difficult to effectively regulate the electronic structure of Pt, limiting the oxidation activity of CO and toluene, and reducing the catalyst's resistance to water and sulfur, making it prone to poisoning and deactivation. If the content is too high, it may cause transition metal oxides to cover the active sites of Pt, blocking the pores, reducing Pt utilization, and may also form an independent inactive phase, resulting in a decrease in specific surface area and mechanical strength.

[0066] According to an embodiment of the present invention, the loading amount of the catalytic coating on the ceramic filter tube substrate is 10~20 wt%, specifically 10wt%, 12wt%, 14wt%, 15wt%, 16wt%, 18wt%, 20wt%, etc.

[0067] This approach helps ensure efficient CO and toluene conversion within the low-temperature range of 200-250℃ while maintaining a low filtration pressure drop and reasonable precious metal costs, and achieves a strong bond between the catalyst layer and the ceramic substrate, guaranteeing long-term operational stability. If the loading is too low, the number of Pt active sites decreases, easily leading to a decline in CO and VOC conversion rates. Simultaneously, an excessively thin catalyst layer results in a small bonding area with the substrate, weak mechanical adhesion, and easy peeling during pulse backflushing. Conversely, an excessively high loading may thicken the catalyst layer, potentially increasing the risk of pore blockage, significantly raising the flue gas filtration pressure drop, and increasing energy consumption. Furthermore, the reduced Pt particle spacing makes it prone to sintering, potentially reducing catalytic activity, and increasing the amount of precious metals used, leading to a substantial increase in costs. According to an embodiment of the present invention, the SiO2 content in the ceramic filter substrate is 40-60 wt%, and the Al2O3 content is 10-30 wt%.

[0068] According to an embodiment of the present invention, the specific surface area of ​​the ceramic filter tube substrate is 10~15 m². 2 / g, specifically 10m 2 / g、11m 2 / g、12m 2 / g、13m 2 / g、14m 2 / g, 15m 2 / g.

[0069] By adopting the above technical solution, a uniform and dense catalytic layer can be formed on the substrate surface by the catalytic slurry. This provides sufficient mechanical anchoring points to enhance coating adhesion while maintaining a reasonable pore structure to reduce mass transfer resistance and filtration pressure drop, thus achieving synergistic optimization of dust removal efficiency and catalytic activity. When the specific surface area is too low, there are fewer sites on the surface for the catalytic slurry to adhere, resulting in poor bonding strength and easy peeling of the catalytic layer. At the same time, there are insufficient effective catalytic active sites per unit volume, limiting the conversion rate of CO and VOCs. Conversely, if the specific surface area is too high, the substrate pores may be too developed or the pore size too small, easily causing uneven distribution of catalytic active components on the surface, increased filtration pressure drop, and increased energy consumption.

[0070] A second aspect of the present invention provides a method for preparing the aforementioned platinum-based ceramic filter catalyst, comprising: Nano-titanium dioxide, soluble Pt salt, sol, dispersant and water are mixed to obtain a platinum-based catalytic slurry; The platinum-based catalytic slurry was coated onto the surface of a ceramic filter substrate, dried, and calcined to obtain a platinum-based ceramic filter catalyst.

[0071] By adopting the above technical solution, a reaction interface integrating physical interception (dust removal) and chemical conversion (CO / VOCs oxidation) can be constructed by combining the catalytic slurry with the ceramic filter substrate. This avoids the poisoning of downstream catalysts by dust in traditional processes and is beneficial to improving catalyst stability. Simultaneously, the structural advantages of the filter itself provide sufficient residence time and contact area for the catalytic reaction, significantly improving catalytic efficiency. The process is simple and easy to promote and apply. Furthermore, it ensures high adhesion, high dispersion, crack resistance, and non-detachment of the catalytic coating on the ceramic filter substrate surface, effectively improving the catalyst's resistance to sulfur and water poisoning, mechanical strength, and stability, lowering the catalyst's activity temperature, increasing the activity temperature window range, and significantly reducing energy consumption. It also synergistically removes VOCs such as CO and toluene, facilitating the long-term stable operation of platinum-based ceramic filter catalysts. The preparation process is simple and conducive to large-scale application.

[0072] In some embodiments, the mixing includes one or more of dissolving, stirring, and ball milling.

[0073] According to an embodiment of the present invention, the coating rate is 0.05~0.1 m / s, specifically 0.05 m / s, 0.06 m / s, 0.07 m / s, 0.08 m / s, 0.09 m / s, 0.1 m / s, etc. This is beneficial for improving the uniformity of the coating and maintaining the optimal valence state of the active components, thereby improving catalytic efficiency. A coating rate that is too fast can easily lead to uneven distribution of the catalytic slurry on the surface of the ceramic filter substrate, potentially causing sagging or bubble defects; a rate that is too slow may result in low production efficiency, and excessive solvent evaporation can easily affect the leveling properties of the slurry.

[0074] According to an embodiment of the present invention, the coating is applied 2 to 4 times, specifically 2, 3, or 4 times. This improves the uniformity of the coating and maintains the optimal valence state of the active component, thereby increasing catalytic efficiency. The number of coating applications determines the thickness of the catalytic layer. Too few applications may result in insufficient loading of the active component and a low conversion rate; too many applications may lead to an excessively thick coating, causing problems such as pore blockage and increased pressure drop, and the inner layer may not dry completely and is prone to cracking.

[0075] According to an embodiment of the present invention, the drying temperature is 100~120℃, and the drying time is 2~4 h. For example, the drying temperature can be 100℃, 102℃, 105℃, 108℃, 110℃, 112℃, 115℃, 118℃, 120℃, etc.; and the drying time can be 2h, 2.2h, 2.5h, 2.8h, 3h, 3.2h, 3.5h, 3.8h, 4h, etc.

[0076] It should be noted that drying temperature and time affect the solvent evaporation rate. If the temperature is too low or the time is too short, the residual solvent may escape rapidly during subsequent baking, causing the coating to blister or crack. If the temperature is too high or the time is too long, the surface may harden prematurely, forming a hard shell that hinders the diffusion of internal solvent and causes structural defects.

[0077] According to an embodiment of the present invention, the calcination temperature is 300~500℃, and the calcination time is 2~4 h. For example, the calcination temperature can be 300℃, 325℃, 350℃, 375℃, 400℃, 425℃, 450℃, 475℃, 500℃, etc.; and the calcination time can be 2h, 2.2h, 2.5h, 2.8h, 3h, 3.2h, 3.5h, 3.8h, 4h, etc.

[0078] This helps improve the uniformity of the coating and maintain the optimal valence state of the active components, thereby improving catalytic efficiency. The calcination temperature and time directly determine the crystal phase composition of the catalyst layer and the dispersion state of Pt. Too low a temperature or insufficient time may lead to incomplete crystallization of the support, weakened interaction between Pt and the support, and easy sintering of active sites. Too high a temperature or too long a time may cause Pt particles to grow, reduce the specific surface area, and may also trigger the transformation of the anatase phase to the rutile phase, reducing catalytic activity.

[0079] According to an embodiment of the present invention, the heating rate of the calcination is 2~10 ℃ / min, specifically such as 2℃ / min, 3℃ / min, 4℃ / min, 5℃ / min, 6℃ / min, 7℃ / min, 8℃ / min, 9℃ / min, 10℃ / min, etc.

[0080] By adopting the above technical solution, the coating can be heated uniformly, and the solvent and organic matter can be volatilized and decomposed slowly, avoiding structural damage. At the same time, it ensures that the Pt precursor is reduced within the optimal temperature window to form highly dispersed nanoparticles, thus ensuring a balance between catalytic activity and mechanical strength. If the calcination heating rate is too fast, thermal stress concentration can easily lead to cracking and peeling of the catalyst layer, and the rapid decomposition of residual organic matter and solvent can generate gas, easily forming pore defects. If the heating rate is too slow, it may prolong the production cycle, increase energy consumption, and prolonged low temperature may cause premature reduction of the Pt precursor, resulting in a decrease in dispersion.

[0081] In some embodiments, the preparation method of the platinum-based ceramic filter catalyst further includes drying the ceramic filter substrate before coating.

[0082] A third aspect of the present invention provides the application of the aforementioned platinum-based ceramic filter catalyst in the synergistic removal of CO and VOCs.

[0083] By adopting the above technical solution, two pollutants can be simultaneously oxidized in the same catalytic system, simplifying the process flow, eliminating multiple independent reactors and connecting pipelines, and significantly reducing costs. CO oxidation is a strongly exothermic reaction, and the released heat can raise the temperature of the catalytic bed in situ, promoting the catalytic combustion of VOCs, reducing external heating energy consumption, and achieving energy coupling utilization. A single catalyst acts on two reactants simultaneously, reducing the types and amounts of catalysts used, improving the utilization efficiency of the precious metal Pt, and making operation and maintenance more convenient. In addition, synergistic removal avoids the problem of temperature window mismatch between units in segmented treatment, achieving efficient conversion of both pollutants in the low-temperature range of 180~250℃ without the need for flue gas reheating, further reducing system energy consumption and carbon emissions, and meeting the environmental protection requirements for pollution reduction and carbon reduction.

[0084] According to an embodiment of the present invention, the VOCs include at least one of benzene, toluene, xylene, formaldehyde, trichloroethylene, and tetrachloroethylene, preferably toluene.

[0085] In some embodiments, the application includes: cutting the platinum-based ceramic filter catalyst into small pieces, adding them to a reactor, and introducing 1% CO, 100 ppm toluene, and 10% O2, with N2 as the equilibrium gas, at a mass hourly space velocity (MSV) of 10,000–60,000 mL·g. -1 ·h -1 CO and toluene were removed in a synergistic manner at 50~300℃.

[0086] The present invention will be explained below with reference to embodiments. Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be considered as limiting the scope of the invention. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in the field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0087] Example 1 50g of nano-TiO2 (particle size 30nm) was dispersed in 500mL of deionized water, and 10ml of aluminum sol, 4.5g of Pt(NO3)2 solution and 10g of polyethylene glycol were added in sequence. The mixture was stirred and mixed for 30 min to obtain a platinum-based catalytic slurry. After drying the 1m long ceramic filter tube substrate with a dryer, 100ml of platinum-based catalyst slurry was sprayed twice at a rate of 0.05m / s onto the ceramic filter tube substrate. Subsequently, it was dried at 110℃ for 4h and then calcined at 500℃ for 2h at a heating rate of 5℃ / min to obtain platinum-based ceramic filter tube catalyst A.

[0088] Example 2 50g of nano-TiO2 (particle size 60nm) was dispersed in 500mL of deionized water, and 20mL of aluminum sol, 4.5g of Pt(NO3)2 solution and 10g of polyethylene glycol were added in sequence. The mixture was stirred and mixed for 30 min to obtain a platinum-based catalytic slurry. After drying the 1m long ceramic filter tube substrate with a dryer, 100ml of platinum-based catalyst slurry was sprayed twice at a rate of 0.05m / s onto the ceramic filter tube substrate. Subsequently, it was dried at 100℃ for 4h and then calcined at 450℃ for 2h at a heating rate of 5℃ / min to obtain platinum-based ceramic filter tube catalyst B.

[0089] Example 3 50g of nano-TiO2 (particle size 100nm) was dispersed in 500mL of deionized water, and 10ml of silica sol, 4.5g of Pt(NO3)2 solution and 10g of polyethylene glycol were added in sequence. The mixture was stirred and mixed for 30 min to obtain a platinum-based catalytic slurry. After drying the 1m long ceramic filter tube substrate with a dryer, 100ml of platinum-based catalyst slurry was sprayed twice at a rate of 0.05m / s onto the ceramic filter tube substrate. Subsequently, it was dried at 110℃ for 4h and then calcined at 500℃ for 2h at a heating rate of 5℃ / min to obtain platinum-based ceramic filter tube catalyst C.

[0090] Example 4 50g of nano-TiO2 (particle size 150nm) was dispersed in 500mL of deionized water, and 15ml of silica sol, 5.8g of H2PtCl6 solution and 15g of polyethylene glycol were added in sequence. The mixture was stirred and mixed for 30 min to obtain a platinum-based catalytic slurry. After drying the 1m long ceramic filter tube substrate with a dryer, 100ml of platinum-based catalyst slurry was sprayed twice at a rate of 0.05m / s onto the ceramic filter tube substrate. Subsequently, it was dried at 110℃ for 4h and then calcined at 500℃ for 2h at a heating rate of 5℃ / min to obtain platinum-based ceramic filter tube catalyst D.

[0091] Example 5 50g of nano-TiO2 (particle size 100nm) was dispersed in 500mL of deionized water, and 10mL of aluminum sol, 6.8g of Pt(CH3COO)4 solution, 15g of polyethylene glycol and 1g of ammonium molybdate were added in sequence. The mixture was stirred and mixed for 30 min to obtain a platinum-based catalytic slurry. After drying the 1m long ceramic filter tube substrate with a dryer, 100ml of platinum-based catalyst slurry was sprayed twice at a rate of 0.05m / s onto the ceramic filter tube substrate. Subsequently, it was dried at 110℃ for 4h and then calcined at 500℃ for 2h at a heating rate of 5℃ / min to obtain platinum-based ceramic filter tube catalyst E.

[0092] Comparative Example 1 50g of nano-TiO2 (particle size 100nm) was dispersed in 500mL of deionized water, and 4.5g of Pt(NO3)2 solution was added. The mixture was stirred continuously for 30 min to obtain a platinum-based catalytic slurry. The platinum-based catalytic slurry was dried at 110℃ for 4h and then calcined at 500℃ for 2h at a heating rate of 5℃ / min to obtain catalyst F.

[0093] Comparative Example 2 50g of nano-TiO2 (particle size 100nm) was dispersed in 500mL of deionized water, and 4.5g of Pt(NO3)2 solution was added. The mixture was stirred continuously for 30 min to obtain a platinum-based catalytic slurry. After drying the 1m long ceramic filter tube substrate with a dryer, 100ml of platinum-based catalyst slurry was sprayed twice at a rate of 0.05m / s onto the ceramic filter tube substrate. Subsequently, it was dried at 110℃ for 4h and then calcined at 500℃ for 2h at a heating rate of 5℃ / min to obtain platinum-based ceramic filter tube catalyst G.

[0094] Effect test 1. Scanning Electron Microscopy (SEM) Test: The platinum-based catalyst slurry prepared in Example 1 was dried at 100°C and then subjected to SEM testing. The results are shown in the figure below. Figure 1 .

[0095] from Figure 1 It can be seen that at the 50nm scale Figure 1 (a) and Figure 1 (b) shows aggregated nanoparticles with individual particle sizes on the order of tens of nanometers; Figure 1 (c) The image, magnified to a 20nm scale, allows for a clearer view of particle details; Figure 1 The image in (d) is magnified to a 10 nm scale, allowing for further observation of the fine structure of the particles. Therefore, Figure 1 This indicates that the particle size distribution of the catalytic slurry is uniform, belonging to nanoscale materials; the particles are not completely isolated in space, but exhibit a certain degree of aggregation, forming chain-like or cluster-like aggregates, indicating that there may be certain interaction forces between the particles, which promote their aggregation.

[0096] 2. Energy-dispersive X-ray spectroscopy (EDS): The platinum-based catalytic slurry prepared in Example 1 was subjected to EDS analysis, and the results are shown in the figure below. Figure 2 .

[0097] from Figure 2 As can be seen, oxygen (red image) and titanium (green image) are widely distributed in the region, indicating that oxygen and titanium have high content and uniform distribution in the catalytic slurry; while platinum (yellow image) is distributed in a dotted form, which is relatively dispersed, indicating that platinum is not uniformly distributed in the material, but exists in the catalytic slurry in the form of loading or doping.

[0098] 3. X-ray photoelectron spectroscopy (XPS) test: The catalysts A to D prepared in Examples 1-4 were subjected to XPS test, and the results are shown in the figure. Figure 3 .

[0099] like Figure 3 As shown in (a), the surfaces of catalysts A to D mainly exhibit adsorbed oxygen (O₂). α ) and lattice oxygen (O β The chemically adsorbed oxygen content of catalysts A and D (8%) was greater than that of catalysts B (5%) and C (4%), indicating that catalysts A and D are more readily adsorbed with oxygen, thus favoring the catalytic oxidation reaction. Figure 3 (b) It can be seen that the Ti species in catalyst AD did not change significantly, indicating that the main species interacting with the active component Pt are oxygen species, which is consistent with... Figure 3 The results of the Pt 4f spectrum in (c) are consistent. Specifically, the peak position of catalyst A is close to 71.2 eV, indicating that Pt on the surface of catalyst A may exist in a metallic state and interacts weakly with surface oxygen species; while the peak position of catalyst D is higher, close to 73 eV, indicating that there is oxidation on the Pt surface, such as PtO. This suggests that the Pt element in the catalyst may exist in both metallic and oxidized states, and that the Pt species interacts strongly with oxygen species, with a certain degree of oxidation on the surface.

[0100] 4. Test of Co-catalytic oxidation of CO and toluene Catalysts A to G prepared in the examples and comparative examples were cut into 2 mm pieces. 2mm 2mm small pieces were then added to a fixed-bed reactor, followed by the addition of a small amount of quartz wool. Based on the catalyst loading, catalysts A through G were placed on the quartz wool according to their respective masses. A mixture of 1% CO, 100ppm toluene, and 10% O2 was introduced, with N2 as the balance gas. The total gas flow rate was maintained at 100 ml / min, and the gas hourly space velocity (GHSV) was 60,000 mL·g⁻¹. 1 ·h 1The test was conducted using Gasmate. Before the test, the reactant gas was switched to bypass the sample tube and enter the detection system directly to ensure that the configured gas concentration reached the set value. The reactant gas was then switched back and passed through the catalyst to be tested in the fixed-bed reactor. Finally, a temperature control program was set with a heating rate of 10 °C / min, and each temperature point was held for 1 h. The composition of the outlet tail gas was detected in real time using infrared spectroscopy. The conversion rates of CO and toluene at different temperatures were calculated, and the results are shown in [Figure number missing]. Figure 4 and Figure 5 .

[0101] like Figure 4 As shown, at lower temperatures, the CO conversion rates of catalysts A through G all increased to varying degrees with increasing temperature, while catalysts A through E achieved complete conversion above 180°C. Within the test temperature range, the CO conversion rates of catalytic filter tubes A and B were higher than those of other catalytic filter tubes, indicating that the platinum-based ceramic filter tube catalysts prepared in Examples 1 and 2 of this invention have superior CO oxidation performance, proving that a specific range of nano-TiO2 particle size is beneficial to improving the CO conversion rate of the platinum-based ceramic filter tube catalysts.

[0102] like Figure 5 As shown, catalysts A through G all achieved toluene conversion rates of over 90% at temperatures above 175°C. Catalysts B and E exhibited even better toluene conversion rates, especially significantly higher than F and G. This indicates that the integrated catalytic filter tube catalyst prepared in this invention possesses not only the aforementioned excellent CO oxidation performance but also excellent toluene oxidation performance. Furthermore, it demonstrates that a specific range of nano-TiO2 particle sizes is beneficial for improving the toluene conversion rate of the platinum-based ceramic filter tube catalyst.

[0103] Combination Figures 4-5 It can be seen that the CO oxidation activity of Example E is slightly lower than that of Example C, but its toluene oxidation activity is significantly improved. This indicates that the introduction of the auxiliary agent increases the acidic sites and reactive centers, which is more conducive to the adsorption and reaction of toluene. However, the acidic centers do not adsorb CO, so they have no promoting effect on CO oxidation. In addition, Example B has the best performance in the synergistic oxidation of CO and toluene. This shows that by loading Pt on a 60 nm anatase phase TiO2 support and using aluminum sol as a binder and polyethylene glycol as a dispersant, a highly dispersed catalytic layer was successfully constructed. The Pt nanoparticles are uniformly distributed, exposing more active sites. Moreover, the Pt-TiO2 interface interaction on the 60 nm anatase phase TiO2 support is the strongest, which is conducive to promoting the migration and activation of oxygen species, thereby further improving the synergistic catalytic oxidation performance of CO and toluene of the platinum-based ceramic filter tube catalyst.

[0104] Stability test: In a fixed-bed reactor, catalyst A prepared in Example 1 and catalysts F-G prepared in Comparative Examples 1-2 were added to a cylindrical reactor, respectively. 1% CO, 100 ppm toluene, and 10% O2 were introduced as equilibrium gases, with a space velocity of 60000 mL·g. 1 ·h 1 The system was run at 240℃ for 50 hours to test the stability of CO and toluene synergistic removal. The results are recorded in Table 1.

[0105] Table 1. Stability test results of catalysts A, F, and G

[0106] As shown in Table 1, after 50 hours of operation, Example 1 (catalyst A) still maintained a CO conversion rate of 96.57%, while the CO conversion rates of Comparative Examples 1 and 2 (catalysts F and G) decreased to 81.34% and 88.65%, respectively. This indicates that the integrated catalytic filter tube prepared in this invention exhibits excellent CO catalytic oxidation stability. The addition of silica-alumina sol and polyethylene glycol is beneficial to improving the stability of the platinum-based ceramic filter tube catalyst.

[0107] 6. Water and sulfur resistance test: Catalyst A prepared in Example 1 and catalyst F prepared in Comparative Example 1 were respectively added to a cylindrical reactor, and 1% CO, 100 ppm toluene, 10% O2, 10% H2O, and 20 ppm SO2 were introduced. N2 was used as the equilibrium gas, and the space velocity was 60000 mL·g. 1 ·h 1 The CO removal performance was tested after running at 240℃ for 50 hours. The results are shown below. Figure 6 .

[0108] from Figure 6 As can be seen, catalyst A exhibited excellent CO oxidation activity throughout the test, with a stable CO conversion rate above 88%, indicating its good resistance to water and sulfur poisoning. Catalyst F showed a significantly lower CO conversion rate than catalyst A in the initial stage. After 50 hours of operation, the CO conversion rate of catalyst F was approximately 63%, consistently remaining far lower than that of catalyst A throughout the entire operation. This demonstrates that the integrated ceramic filter tube of this invention not only achieves highly efficient CO catalytic oxidation but also exhibits excellent resistance to water and sulfur poisoning under water and sulfur-containing conditions. It solves the problem of existing precious metal catalysts being susceptible to water and sulfur contamination, leading to a sharp drop in activity, and possesses excellent prospects for industrial application.

[0109] 7. Mechanical property testing: The ring compression strength, compressive strength and other properties of catalysts A to D prepared in Examples 1 to 4 and catalyst G prepared in Comparative Example 2 were tested, and the results are recorded in Table 2. Table 2. Test results of mechanical properties of catalysts A~D and G

[0110] Table 2 shows that the ring compressive strength of catalysts A to D ranges from 0.33 to 0.42 MPa, and their compressive strength ranges from 1.05 to 1.10 MPa, all meeting the basic requirements for the structural strength of ceramic filter tubes in industrial flue gas filtration systems (typically, ring compressive strength ≥ 0.30 MPa). Crucially, despite the catalytic coating loaded on the inner wall of the ceramic filter tube, the mechanical strength of all embodiments did not show significant deterioration; some samples (such as catalysts B and C) even showed slightly higher strength than catalyst G without the optimized coating. This result indicates that the catalytic slurry formulation used in this invention, while forming a highly active catalytic layer, does not negatively impact the mechanical properties of the ceramic filter tube matrix, ensuring that the filter tube can efficiently remove dust and stably perform catalytic oxidation during long-term operation.

[0111] In the description of this specification, the references to terms such as "an embodiment," "some embodiments," "a method of implementation," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0112] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A platinum-based ceramic filter tube catalyst, characterized in that, include: Ceramic filter tube substrate; A catalytic coating, said catalytic coating being located on at least a portion of the surface of the ceramic filter substrate; The raw materials for the catalytic coating include a platinum-based catalytic slurry, which comprises nano-titanium dioxide, soluble Pt salt, sol, dispersant, and water.

2. The platinum-based ceramic filter catalyst according to claim 1, characterized in that, At least one of the following conditions must be met: The soluble Pt salt includes one or more of platinum nitrate, chloroplatinic acid, ammonium chloroplatinate, sodium chloroplatinate, platinum acetate, dichlorodiammineplatinum, tetraammineplatinum nitrate, and tetraammineplatinum chloride, with platinum nitrate being preferred; The content of soluble Pt salt in the platinum-based catalytic slurry is 0.5~1.5 wt% of nano-TiO2.

3. The platinum-based ceramic filter catalyst according to claim 1, characterized in that, At least one of the following conditions must be met: The sol includes at least one of silica sol and aluminum sol; The dispersant includes one or more of polyethylene glycol, polypropylene glycol, and polyether block copolymers.

4. The platinum-based ceramic filter catalyst according to claim 1, characterized in that, At least one of the following conditions must be met: The particle size of the nano-titanium dioxide is 30~150nm; The nano-titanium dioxide has anatase as its crystal phase.

5. The platinum-based ceramic filter catalyst according to claim 4, characterized in that, At least one of the following conditions must be met: The solid content in the platinum-based catalyst slurry is 10~30 wt%; The catalytic coating is loaded at a rate of 10-20 wt% on the ceramic filter substrate. The specific surface area of ​​the ceramic filter tube matrix is ​​10~15 m². 2 / g.

6. The platinum-based ceramic filter catalyst according to any one of claims 1 to 5, characterized in that, The platinum-based catalytic slurry also includes additives; Optionally, the additive includes at least one of a nitrate or ammonium salt of a 3d transition metal; Optionally, the 3d transition metal includes one or more of Mo, Cu, and Co.

7. A method for preparing a platinum-based ceramic filter tube catalyst as described in any one of claims 1 to 6, characterized in that, include: Nano-titanium dioxide, soluble Pt salt, sol, dispersant and water are mixed to obtain a platinum-based catalytic slurry; The platinum-based catalytic slurry was coated onto the surface of a ceramic filter substrate, dried, and calcined to obtain a platinum-based ceramic filter catalyst.

8. The method for preparing the platinum-based ceramic filter catalyst according to claim 7, characterized in that, At least one of the following conditions must be met: The coating rate is 0.05~0.1 m / s; The coating is applied 2 to 4 times.

9. The method for preparing the platinum-based ceramic filter catalyst according to claim 7 or 8, characterized in that, The drying temperature is 100~120 ℃, and the drying time is 2~4 h; The calcination temperature is 300~500 ℃, and the calcination time is 2~4 h; The heating rate for roasting is 2~10 ℃ / min.

10. The application of a platinum-based ceramic filter catalyst as described in any one of claims 1 to 6, or a platinum-based ceramic filter catalyst prepared by the preparation method described in any one of claims 7 to 9, in the synergistic removal of CO and VOCs.

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