Ozone decomposition catalyst as well as preparation method and application thereof in ozone decomposition

Abstract

The invention discloses an ozonolysis catalyst, a preparation method thereof and application of the ozonolysis catalyst in ozonolysis. The ozonolysis catalyst comprises a catalytic layer, the catalyst layer comprises an active component, hydrophobic particles and a binder; the active component contains an active element, and the active element is selected from at least one of manganese, cerium, copper and precious metal. The hydrophobic material with the particle size of 20 nm-40 microns is added into the slurry of the active component, so that the hydrophobic performance of the catalyst layer can be improved, and the competitive adsorption effect of water molecules on active sites on ozone molecules is inhibited, thereby enhancing the water resistance of the active component, and meanwhile, the hydrophobic material plays a role of a binder to improve the strength of the catalyst layer.

Description

Technical Field

[0001] The present application relates to an ozone decomposition catalyst, a preparation method thereof, and an application thereof in ozone decomposition, belonging to the field of gas purification. Background Art

[0002] Ozone is an allotrope of oxygen, composed of three oxygen atoms. Due to its strong oxidation ability, it is widely used in fields such as healthcare, food preservation, water quality, and air purification. However, according to the World Health Organization, long-term exposure to low-concentration (0.1 ppm) O3 can cause damage to the human lungs and cardiovascular system, and high-concentration ozone can even endanger life safety. Therefore, the Ministry of Health of the country has clearly stipulated that the safe concentration of ozone is 0.1 ppm, and the industrial hygiene standard is 0.15 ppm.

[0003] Currently, the methods for ozone decomposition at home and abroad mainly include activated carbon adsorption method, thermal decomposition method, drug absorption method, and catalytic decomposition method. Among them, the catalytic decomposition method is simple, general, low-cost, and has good stability, so it is considered the most promising method for ozone decomposition in practical applications. However, in the application scenario of catalytic decomposition of ozone by existing catalysts, it is inevitable that the gas contains water molecules, and the performance of most reported catalysts will be significantly inhibited under the condition of the presence of water molecules. This is because water molecules can compete with ozone molecules for adsorption at the active sites, and water molecules will form a water film to occupy the active center. Therefore, it is very important to prepare a catalyst that can efficiently decompose ozone under high humidity.

[0004] In response to the phenomenon of catalyst deactivation under high humidity, researchers mainly focus on the following aspects: 1. Increasing oxygen vacancies, such as doping other transition metal elements into manganese-based catalysts. Chen et al. proposed in "High performance ozone decomposition spinel (Mn,Co)3O4 catalyst accelerating the rate-determining step" to synthesize (Mn,Co)3O4 by the co-precipitation method of Co and Mn. The obtained catalyst has more oxygen vacancies, thus improving water resistance. CN117085694A also discloses a method of doping Fe to modify manganese-based catalysts to improve water resistance; 2. Using organic catalysts, such as MOFs, etc.; 3. Using water-resistant noble metal active centers, such as palladium, platinum, silver, etc. CN 116265101A discloses an ozone decomposition catalyst with excellent low-temperature activity and water resistance, which improves water resistance by loading highly dispersed noble metals on nitrogen-doped manganese-based catalysts; 4. Chemical hydrophobic modification of the catalyst surface. For example, CN 113952949A discloses a process of surface silanization modification of the catalyst using a silane coupling agent, which can greatly improve the hydrophobic ability of the catalyst, so that the ozone removal rate can be maintained at 95% at 50% relative humidity and 20 ppm concentration. Although the above methods can all improve the ozone decomposition ability of the catalyst under high humidity, there are problems such as the doping method is difficult to precisely control the catalyst synthesis, the cost of organic catalysts or noble metal catalysts is relatively high, the method of chemical hydrophobic surface grafting modification requires complex operations and post-treatment, and the traditional coating slurry preparation method often results in a loose catalyst layer and prone to powder falling phenomenon. Summary of the Invention

[0005] Based on the above requirements for ozone decomposition under high humidity in the background technology and the defects existing in the current technology, the purpose of the present invention is to provide a simple, reliable and low-cost physical mixing hydrophobic modification method, which has obvious anti-water effect, strong scalability and is easy to realize large-scale production.

[0006] In one aspect of the present application, an ozone decomposition catalyst is provided, which can maintain an ozone decomposition effect of more than 95% within 24 hours under the condition of 10-95% relative humidity;

[0007] The ozone decomposition catalyst includes a catalytic layer;

[0008] The catalytic layer includes an active component, a hydrophobic particle and a binder;

[0009] The active component contains an active element, and the active element is selected from at least one of manganese, cerium, copper, and noble metals.

[0010] Optionally, the ozone decomposition catalyst further includes a carrier, and the catalytic layer is loaded on the carrier;

[0011] The carrier has a honeycomb structure, and the carrier is selected from at least one of cordierite, alumina, and molecular sieve.

[0012] Optionally, the noble metal is selected from at least one of Pd and Ru.

[0013] Optionally, the hydrophobic particles are selected from at least one of polyethylene, polypropylene, polystyrene, polydivinylbenzene, styrene divinylbenzene copolymer, and polytetrafluoroethylene.

[0014] Optionally, the particle size of the hydrophobic particles is 20 nm to 40 μm.

[0015] Optionally, the particle size of the hydrophobic particles is independently selected from any value of 20 nm, 200 nm, 400 nm, 500 nm, 800 nm, 1 μm, 10 μm, 20 μm, 40 μm or a range value between any two of the above.

[0016] Optionally, the binder is selected from at least one of hydroxymethyl cellulose, sodium carboxymethyl cellulose, pseudo-boehmite, silica gel, and kaolin.

[0017] Optionally, the water contact angle of the catalytic layer is 90 to 140°.

[0018] Optionally, in the catalytic layer of the ozone decomposition catalyst, the mass content of the active component is 10 to 70%, the mass content of the hydrophobic particles is 10 to 60%, and the mass content of the binder is 5 to 35%.

[0019] Optionally, in the ozone decomposition catalyst, the mass content of the hydrophobic particles is independently selected from any value of 0.5%, 10%, 20%, 30%, 40%, 50%, 60% or a range value between any two of the above.

[0020] In another aspect of the present application, a preparation method of the above-mentioned ozone decomposition catalyst is provided, and the preparation method includes:

[0021] A mixture containing an active substance, hydrophobic particles, a binder, and water is made into a slurry, dried and calcined to obtain the ozone decomposition catalyst.

[0022] Optionally, the active substance is selected from at least one of manganese oxide, cerium oxide, copper oxide, and noble metals;

[0023] The hydrophobic particles are selected from at least one of polyethylene, polypropylene, polystyrene, polydivinylbenzene, styrene divinylbenzene copolymer, and polytetrafluoroethylene;

[0024] The binder is selected from at least one of hydroxymethyl cellulose, sodium carboxymethyl cellulose, pseudoboehmite, silica gel, and kaolin.

[0025] Optionally, the noble metal is selected from at least one of Pd and Ru.

[0026] Optionally, in the slurry, the mass content of water is 35-85%, the mass content of the active substance is 5-30%, the mass content of the binder is 3-30%, and the mass content of the hydrophobic particles is 5-30%.

[0027] Optionally, in the slurry, the mass content of the active substance is independently selected from any value of 5%, 10%, 13%, 15%, 20%, 25%, 30% or the range value between any two of the above.

[0028] Optionally, in the slurry, the mass content of the binder is independently selected from any value of 3%, 9%, 10%, 15%, 20%, 25%, 30% or the range value between any two of the above.

[0029] Optionally, in the slurry, the mass content of the hydrophobic particles is independently selected from any value of 5%, 10%, 13%, 15%, 20%, 25%, 30% or the range value between any two of the above.

[0030] Optionally, the preparation method further includes:

[0031] Before drying, the slurry is coated on the surface of the carrier.

[0032] Specifically, the preparation method includes:

[0033] A mixed slurry containing an active substance, hydrophobic particles, a binder, and water is coated on the surface of the carrier, dried, and calcined to obtain the ozone decomposition catalyst.

[0034] Optionally, the carrier is at least one of cordierite, alumina, and molecular sieve honeycomb ceramics;

[0035] Optionally, the drying temperature is 60-140 °C, and the drying time is 3-24 h;

[0036] Optionally, the calcination temperature is 80-300 °C, and the calcination time is 1-6 h.

[0037] Optionally, the preparation method of the slurry includes:

[0038] The active substance, hydrophobic particles, binder, and water are mixed by ball milling.

[0039] As a specific embodiment, the method for preparing the high-humidity ozone decomposition catalyst by physical mixing includes the following steps:

[0040] (1) Mix the active component, hydrophobic particles, binder and water evenly;

[0041] (2) Coat the slurry obtained in step (1) onto the carrier;

[0042] (3) Dry and calcine the obtained catalyst.

[0043] In another aspect of the present application, there is provided an application of the above-mentioned ozone decomposition catalyst in ozone decomposition. The ozone decomposition catalyst decomposes ozone under the conditions of a relative humidity of 10-95% and an ozone concentration of 1-100 ppm.

[0044] The beneficial effects that the present application can produce include:

[0045] In the present application, by adding a hydrophobic material with a particle size of 20 nm to 40 μm to the slurry of the active component, the hydrophobic property of the catalytic layer can be improved (the contact angle changes from <20° to >90°), thereby enhancing the water resistance of the active component, improving the adsorption selectivity for ozone molecules, and at the same time acting as a binder to improve the strength of the catalytic layer. The present application is suitable for adding hydrophobic materials such as polyethylene, polypropylene, polystyrene, polydivinylbenzene, styrene-divinylbenzene copolymer, and polytetrafluoroethylene to the catalyst capable of decomposing ozone, such as manganese oxide, cerium oxide, copper oxide, or noble metal-based catalyst slurries. By adjusting the content and particle size of the hydrophobic material, the hydrophobic strength can be adjusted, which is suitable for ozone treatment under high-humidity conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a photograph of the catalysts obtained in Example 7 and Comparative Example 4 of the present application. Among them, Figure a is a photograph of the catalyst prepared in Comparative Example 4 without hydrophobic particles, and Figure b is a photograph of the catalyst prepared in Example 7 with added polystyrene nanoparticles.

[0047] Figure 2 It is a water contact angle measurement diagram of the catalysts obtained in Example 7 and Comparative Example 4 of the present application. Among them, Figures a and c are the water contact angles of the catalyst prepared in Example 7 with added polystyrene nanoparticles, and Figures b and d are the water contact angles of the catalyst prepared in Comparative Example 4 without hydrophobic particles.

[0048] Figure 3 It is a SEM diagram of the catalyst obtained in Example 1 of the present application. Among them, Figures a and b are the catalyst layers with added polystyrene nanoparticles. The scale of Figure a is 10 μm, and the scale of Figure b is 1 μm; Figure c is the synthesized manganese oxide-based catalyst, and the scale is 1 μm; Figure d is the hydrophobic particle polystyrene particle, and the scale is 1 μm. Specific Embodiments

[0049] The present application will be described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0050] Unless otherwise specified, the raw materials in the embodiments of the present application are all purchased through commercial channels.

[0051] Embodiment 1

[0052] (1) Preparation of Active Material Slurry

[0053] Mix 3 g of manganese oxide, 2.5 g of pseudoboehmite, 0.5 g of polystyrene with a particle size of 20 nm (molecular weight of 150,000), and 3.5 g of water, and put them into a ball mill. The rotation speed is 500 rpm, and ball mill for 6 h to obtain the corresponding catalyst slurry.

[0054] (2) Coating

[0055] Put 20×25 mm cordierite into the above-mentioned uniform slurry, blow off the residual slurry on the surface, and dry at 60 °C for 24 h.

[0056] (3) Drying and Calcination

[0057] Calcine the dried catalyst at 80 °C for 6 h.

[0058] Evaluate under the conditions of a relative humidity of 95% and an inlet ozone concentration of 1 ppm.

[0059] Embodiment 2

[0060] (1) Preparation of Active Material Slurry

[0061] Mix 0.5 g of manganese oxide, 2 g of hydroxymethyl cellulose, 1 g of sodium carboxymethyl cellulose, 3 g of polystyrene with a particle size of 20 nm (molecular weight of 150,000), and 3.5 g of water, and put them into a ball mill. The rotation speed is 500 rpm, and ball mill for 6 h to obtain the corresponding catalyst slurry.

[0062] (2) Coating

[0063] Put 20×25 mm molecular sieve into the above-mentioned uniform slurry, blow off the residual slurry on the surface, and dry at 120 °C for 3 h.

[0064] (3) Drying and Calcination

[0065] Calcine the dried catalyst at 140 °C for 4 h.

[0066] Evaluate under the conditions of a relative humidity of 90% and an inlet ozone concentration of 10 ppm.

[0067] Embodiment 3

[0068] (1) Preparation of active material slurry

[0069] Mix 1 g of cerium oxide, 3 g of pseudo-boehmite, 0.5 g of polydivinylbenzene with a particle size of 200 nm, and 5.5 g of water in a ball mill, rotate at 500 rpm, and ball mill for 6 h to obtain the corresponding catalyst slurry.

[0070] (2) Coating

[0071] Put the 20×25 mm molecular sieve into the above-mentioned uniform slurry, blow off the residual slurry on the surface, and dry at 140 °C for 5 h.

[0072] (3) Drying and calcination

[0073] Calcine the dried catalyst at 200 °C for 5 h.

[0074] Evaluate under the conditions of relative humidity of 80% and inlet ozone concentration of 20 ppm.

[0075] Example 4

[0076] (1) Preparation of active material slurry

[0077] Mix 2 g of copper oxide, 1 g of pseudo-boehmite, 1 g of silica gel, 2 g of styrene divinylbenzene copolymer with a particle size of 400 nm, and 4 g of water in a ball mill, rotate at 500 rpm, and ball mill for 6 h to obtain the corresponding catalyst slurry.

[0078] (2) Coating

[0079] Put the 20×25 mm molecular sieve into the above-mentioned uniform slurry, blow off the residual slurry on the surface, and dry at 140 °C for 3 h.

[0080] (3) Drying and calcination

[0081] Calcine the dried catalyst at 120 °C for 4 h.

[0082] Evaluate under the conditions of relative humidity of 60% and inlet ozone concentration of 40 ppm.

[0083] Example 5

[0084] (1) Preparation of active material slurry

[0085] Mix 1 g of manganese oxide, 50 mL of chloropalladic acid containing 0.01 g of Pd, 0.2 g of hydroxymethyl cellulose, 0.1 g of sodium carboxymethyl cellulose, 2.7 g of polystyrene with a particle size of 500 nm, and 6 g of water in a ball mill, rotate at 500 rpm, and ball mill for 6 h to obtain the corresponding catalyst slurry.

[0086] (2) Coating

[0087] Put the molecular sieve of 20×25mm into the above-mentioned obtained uniform slurry, blow off the residual slurry on the surface, and dry it at 140°C for 3h.

[0088] (3) Drying and roasting

[0089] Roast the dried catalyst at 300°C for 4h.

[0090] Evaluate under the conditions of a relative humidity of 30% and an inlet ozone concentration of 60ppm.

[0091] Example 6

[0092] (1) Preparation of active substance slurry

[0093] Mix 0.5g of manganese oxide, 0.5g of copper oxide, 0.5g of cerium oxide, 1g of hydroxymethyl cellulose, 3g of styrene divinylbenzene copolymer with a particle size of 40μm and 3.5g of water, put them into a ball mill, rotate at 500rpm, and ball mill for 6h to obtain the corresponding catalyst slurry.

[0094] (2) Coating

[0095] Put the molecular sieve of 20×25mm into the above-mentioned obtained uniform slurry, blow off the residual slurry on the surface, and dry it at 140°C for 3h.

[0096] (3) Drying and roasting

[0097] Roast the dried catalyst at 180°C for 4h.

[0098] Evaluate under the conditions of a relative humidity of 10% and an inlet ozone concentration of 100ppm.

[0099] Example 7

[0100] (1) Preparation of active substance slurry

[0101] Mix 10g of manganese oxide, 5g of hydroxymethyl cellulose, 2g of pseudo-boehmite, 10g of polystyrene with a particle size of 20nm and 50g of water, put them into a ball mill, rotate at 500rpm, and ball mill for 6h to obtain the corresponding catalyst slurry.

[0102] (2) Coating

[0103] Put the molecular sieve of 120×120×50mm into the above-mentioned obtained uniform slurry, blow off the residual slurry on the surface, and dry it at 120°C for 3h.

[0104] (3) Drying and roasting

[0105] Roast the dried catalyst at 160°C for 4h.

[0106] Evaluate under the conditions of a relative humidity of 95% and an inlet ozone concentration of 10ppm.

[0107] Example 8

[0108] (1) Preparation of active material slurry

[0109] Mix 3 g of manganese oxide, 2.5 g of kaolin, 0.5 g of polytetrafluoroethylene with a particle size of 100 nm, and 3.5 g of water in a ball mill, rotate at 500 rpm, and ball mill for 6 h to obtain the corresponding catalyst slurry.

[0110] (2) Coating

[0111] Put the cordierite of 20×25 mm into the above obtained uniform slurry, blow off the residual slurry on the surface, and dry at 60 °C for 24 h.

[0112] (3) Drying and calcination

[0113] Calcine the dried catalyst at 80 °C for 6 h.

[0114] Evaluate under the conditions of relative humidity of 95% and inlet ozone concentration of 10 ppm.

[0115] Example 9

[0116] (1) Preparation of active material slurry

[0117] Mix 10 g of manganese oxide, 5 g of hydroxymethyl cellulose, 2 g of pseudoboehmite, 10 g of polystyrene with a particle size of 20 nm, and 50 g of water in a ball mill, rotate at 500 rpm, and ball mill for 6 h to obtain the corresponding catalyst slurry.

[0118] (2) Drying and calcination

[0119] Calcine the catalyst dried at 60 °C at 300 °C for 6 h.

[0120] (3) Grinding and screening

[0121] After grinding the obtained solid, take the sample screened with 40 - 60 mesh for evaluation.

[0122] Comparative Example 1

[0123] (1) Preparation of active material slurry

[0124] Mix 3 g of manganese oxide, 2.5 g of pseudoboehmite, and 3.5 g of water in a ball mill, rotate at 500 rpm, and ball mill for 6 h to obtain the corresponding catalyst slurry.

[0125] (2) Coating

[0126] Put the cordierite of 20×25 mm into the above obtained uniform slurry, blow off the residual slurry on the surface, and dry at 60 °C for 24 h.

[0127] (3) Drying and roasting

[0128] The dried catalyst was roasted at 80 °C for 6 h.

[0129] Evaluation was carried out under the conditions of a relative humidity of 95% and an inlet ozone concentration of 1 ppm.

[0130] Comparative Example 2

[0131] (1) Preparation of active substance slurry

[0132] 1 g of cerium oxide, 3 g of pseudoboehmite and 5.5 g of water were mixed and put into a ball mill, and the ball mill was rotated at 500 rpm for 6 h to obtain the corresponding catalyst slurry.

[0133] (2) Coating

[0134] The molecular sieve of 20×25 mm was put into the above-mentioned uniform slurry, and the residual slurry on the surface was blown clean and dried at 140 °C for 5 h.

[0135] (3) Drying and roasting

[0136] The dried catalyst was roasted at 200 °C for 5 h.

[0137] Evaluation was carried out under the conditions of a relative humidity of 90% and an inlet ozone concentration of 10 ppm.

[0138] Comparative Example 3

[0139] (1) Preparation of active substance slurry

[0140] 1 g of cerium oxide, 3 g of pseudoboehmite and 5.5 g of water were mixed and put into a ball mill, and the ball mill was rotated at 500 rpm for 6 h to obtain the corresponding catalyst slurry.

[0141] (2) Coating

[0142] The molecular sieve of 20×25 mm was put into the above-mentioned uniform slurry, and the residual slurry on the surface was blown clean and dried at 140 °C for 5 h.

[0143] (3) Drying and roasting

[0144] The dried catalyst was roasted at 200 °C for 5 h.

[0145] Evaluation was carried out under the conditions of a relative humidity of 80% and an inlet ozone concentration of 20 ppm.

[0146] Comparative Example 4

[0147] (1) Preparation of active substance slurry

[0148] Mix 14 g of manganese oxide, 8 g of hydroxymethyl cellulose, 3 g of pseudo-boehmite and 50 g of water in a ball mill, rotate at 500 rpm and ball mill for 6 h to obtain the corresponding catalyst slurry.

[0149] (2) Coating

[0150] Put the molecular sieve of 120×120×50 mm into the above-mentioned obtained uniform slurry, blow the residual slurry on the surface clean, and dry at 120 °C for 3 h.

[0151] (3) Drying and calcination

[0152] Calcine the dried catalyst at 160 °C for 4 h.

[0153] Evaluate under the conditions of relative humidity of 95% and inlet ozone concentration of 10 ppm.

[0154] Table 1

[0155] Number Relative Humidity / % Contact Angle / ° Ozone Conversion Rate in 24h / % Example 1 95 102 95.4 Example 2 90 114 96.3 Example 3 80 106 96.4 Example 4 60 110 97.8 Example 5 30 124 99.5 Example 6 10 108 99.4 Example 7 95 113 98.4 Example 8 95 136 99.2 Example 9 95 95 98.4 Comparative Example 1 95 10 16.8 Comparative Example 2 90 12 24.2 Comparative Example 3 80 6 26.7 Comparative Example 4 95 8 21.3

[0156] Test Example 1

[0157] The analysis methods in Examples 1 to 6, 8 and Comparative Examples 1 to 3 are as follows:

[0158] The ozone concentrations at the inlet and outlet of the reactor are detected by a 2B Technologies 106-L device; an Aoshan ozone generator is used for the ozone generator;

[0159] Use a German Krüss DSA100 for contact angle measurement;

[0160] Use a JSM-7800F for SEM test analysis. Among them, the SEM test results of the catalytic layer of the catalyst prepared in Example 1 are as Figure 3 shown. It can be seen from the figure that after mixing the hydrophobic particles and the active substance manganese oxide, the coated surface is smooth, and the hydrophobic particles and the active substance are evenly mixed, thus providing a suitable hydrophobic environment.

[0161] In the examples of this application, the ozone conversion rate calculation formula is:

[0162]

[0163] In the examples of this application, the prepared catalyst is used for reaction evaluation in a constant temperature and humidity device to measure the catalytic ozone decomposition performance. The experimental conditions are as follows: the catalyst prepared with 20×25 mm is placed in a reaction tube with an inner diameter of 28 mm equipped with a card seat. The relative humidity is controlled by a bubbling device, the reaction temperature is controlled by a circulating water jacket at 25.0±2 °C, and the inlet gas flow rate is 3 L / min.

[0164] Test Example 2

[0165] The analysis methods in Example 7 and Comparative Example 4 are as follows:

[0166] The ozone concentrations at the inlet and outlet of the reactor were detected by a 2B Technologies 106-L device; an Aoshan ozone generator was used for the ozone generator;

[0167] The contact angle was measured using a Krüss DSA100 from Germany. The test results are as Figure 2 shown. As can be seen from Figure 2 it, the addition of hydrophobic particles significantly improved the surface hydrophobic effect of the catalyst. The addition of polystyrene particles made the catalyst surface hydrophobic, and the contact angle changed from 18.1 ± 0.2° to 113.3 ± 0.2°;

[0168] SEM test analysis was carried out using a JSM-7800F.

[0169] Observing the catalysts of Example 7 and Comparative Example 4, as Figure 1 shown, comparing Figure 1 Figures a and b in it, it shows that the addition of hydrophobic particles of polystyrene can improve the adhesion effect of the slurry and reduce the phenomenon of coating particle dropping.

[0170] In the examples of this application, the calculation formula for ozone conversion rate is:

[0171]

[0172] In the examples of this application, the prepared catalyst was subjected to reaction evaluation in a constant temperature and humidity device to measure the catalytic ozone decomposition performance. The experimental conditions were as follows: The prepared catalyst of 120×120×50 mm was placed in a reaction tube with an inner diameter of 280 mm. The relative humidity was controlled by a bubbling device, the reaction temperature was controlled at 25.0 ± 2°C, and the inlet gas flow rate was 10 L / min.

[0173] Test Example 3

[0174] The analysis methods in Example 7 and Comparative Example 4 are as follows:

[0175] The ozone concentrations at the inlet and outlet of the reactor were detected by a 2B Technologies 106-L device; an Aoshan ozone generator was used for the ozone generator;

[0176] The contact angle was measured using a Krüss DSA100 from Germany;

[0177] SEM test analysis was carried out using a JSM-7800F.

[0178] In the examples of this application, the calculation formula for ozone conversion rate is:

[0179]

[0180] In the embodiments of the present application, the catalyst prepared as follows is used for reaction evaluation in a constant temperature and humidity device to measure the catalytic ozone decomposition performance. The experimental conditions are as follows: 100 mg of 40-60 mesh sample is evaluated under the conditions of a gas flow rate of 2 L / min, a relative humidity of 95%, and an inlet ozone concentration of 1 ppm.

[0181] The catalyst is placed in a reaction tube with an inner diameter of 6 mm. The relative humidity is controlled by a bubbling device, the reaction temperature is controlled at 25.0 ± 2 °C, and the inlet gas flow rate is 10 L / min.

[0182] As described above, only several embodiments of the present application are provided, and no any form of limitation is imposed on the present application. Although the present application is disclosed by the preferred embodiments, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications within the scope of the technical solution of the present application by using the disclosed technical content, which are equivalent to equivalent implementation cases and all fall within the scope of the technical solution.

Claims

1. An ozone decomposition catalyst, characterized in that The ozone decomposition catalyst includes a catalytic layer; The catalytic layer includes active components, hydrophobic particles and a binder; The active component contains an active element, and the active element is selected from at least one of manganese, cerium, copper, and precious metals.

2. The ozone decomposition catalyst according to claim 1, characterized in that The ozone decomposition catalyst further comprises a carrier, and the catalytic layer is supported on the carrier; The carrier is a honeycomb structure, and the carrier is selected from at least one of cordierite, alumina, and molecular sieve; Preferably, the noble metal is selected from at least one of Pd and Ru; Preferably, the hydrophobic particles are selected from at least one of polyethylene, polypropylene, polystyrene, polydivinylbenzene, styrene-divinylbenzene copolymer, and polytetrafluoroethylene; Preferably, the particle size of the hydrophobic particles is 20 nm to 40 μm; Preferably, the binder is selected from at least one of hydroxymethyl cellulose, sodium carboxymethyl cellulose, pseudo-boehmite, silica gel, and kaolin; Preferably, the water contact angle of the catalytic layer is 90° to 140°.

3. The ozone decomposition catalyst according to claim 1, characterized in that In the catalytic layer of the ozone decomposition catalyst, the mass content of the active component is 10-70%, the mass content of the hydrophobic particles is 10-60%, and the mass content of the binder is 5-35%.

4. A method for preparing the ozone decomposition catalyst according to any one of claims 1 to 3, characterized in that: The preparation method comprises: A mixture containing active substances, hydrophobic particles, a binder and water is made into a slurry, which is then dried and calcined to obtain the ozone decomposition catalyst.

5. The preparation method according to claim 4, characterized in that The active material is selected from at least one of manganese oxide, cerium oxide, copper oxide, and precious metals; The hydrophobic particles are selected from at least one of polyethylene, polypropylene, polystyrene, polydivinylbenzene, styrene-divinylbenzene copolymer, and polytetrafluoroethylene; The binder is selected from at least one of hydroxymethyl cellulose, sodium carboxymethyl cellulose, pseudo-boehmite, silica gel and kaolin; Preferably, the noble metal is selected from at least one of Pd and Ru.

6. The preparation method according to claim 4, characterized in that In the slurry, the mass content of water is 35-85%, the mass content of active substances is 5-30%, the mass content of binder is 3-30%, and the mass content of hydrophobic particles is 5-30%.

7. The preparation method according to claim 4, characterized in that The preparation method further comprises: Before drying, the slurry is applied to the surface of a support; Preferably, the carrier is a honeycomb structure, and the carrier is selected from at least one of cordierite, alumina, and molecular sieve.

8. The preparation method according to claim 4, characterized in that The drying temperature is 60 to 140° C., and the drying time is 3 to 24 hours.

9. The preparation method according to claim 4, characterized in that The calcination temperature is 80-300° C., and the calcination time is 1-6 hours.

10. Use of the ozone decomposition catalyst according to any one of claims 1 to 3 in ozone decomposition, characterized in that: The ozone decomposition catalyst performs ozone decomposition under the conditions of relative humidity of 10-95% and ozone concentration of 1-100 ppm.

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