Composite metal oxide honeycomb CO oxidation catalyst and preparation device thereof

Abstract

The present invention relates to the field of catalysts, particularly to a composite metal oxide honeycomb CO oxidation catalyst, the active components of the honeycomb CO oxidation catalyst comprise Pt and a Pd metal coating loaded on the surface of the composite carrier, the loading amount of the Pt is 0.1-2% of the total dosage of the catalyst, the loading amount of the Pd metal coating is 0.1-2% of the total dosage of the catalyst, and the loading amount of the composite carrier is 0.1-2% of the total dosage of the catalyst. A carrier of the honeycomb CO oxidation catalyst is TiO2 and Al2O3, a selective reinforcing agent of the honeycomb CO oxidation catalyst is V2O5, and the content of the V2O5 is 3-5%. By finely regulating and controlling the ratio of the active component to the carrier material, the high-efficiency oxidation capacity of the catalyst to CO at low temperature is realized, meanwhile, good selectivity is kept, and side reactions are reduced. The calcining process ensures the thermal stability and mechanical strength of the catalyst, so that the catalyst can adapt to long-time high-temperature operation.

Description

Technical Field

[0001] The invention belongs to the technical field of catalysts, and in particular relates to a composite metal oxide honeycomb CO oxidation catalyst and a preparation device thereof. Background Art

[0002] In the steel sintering machine industry, the application of CO oxidation catalyst is crucial. It can convert toxic carbon monoxide (CO) into harmless carbon dioxide (CO2), which plays a vital role in environmental protection and air quality improvement. The catalyst accelerates the reaction rate between CO and oxygen (O2) by reducing the activation energy of the chemical reaction, allowing this conversion process to proceed at a lower temperature. In addition, CO oxidation catalyst technology is also widely used in many fields such as automobile exhaust treatment, industrial exhaust gas purification and indoor air purification.

[0003] However, due to the complex composition of sintering flue gas and the presence of various impurities, these factors may cause the CO catalyst to be poisoned and deactivated, accelerating the deactivation rate of the catalyst. Currently, the CO catalysts on the market often cannot meet the stringent conditions in actual industrial applications. Summary of the invention

[0004] (I) Purpose of the invention

[0005] In order to overcome the above shortcomings, the purpose of the present invention is to provide a composite metal oxide honeycomb CO oxidation catalyst and a preparation device thereof to solve the above technical problems.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the technical solutions provided by this application are as follows:

[0008] A composite metal oxide honeycomb CO oxidation catalyst,

[0009] The active components of the honeycomb CO oxidation catalyst include Pt and a Pd metal coating loaded on the surface of a composite carrier, wherein the Pt loading is 0.1-2% of the total catalyst dosage, and the Pd metal coating loading is 0.1-2% of the total catalyst dosage. The carrier of the honeycomb CO oxidation catalyst is TiO2 and Al2O3, and the selectivity enhancer of the honeycomb CO oxidation catalyst is V2O5, and the content of V2O5 is 3-5%;

[0010] The preparation method of the composite metal oxide honeycomb CO oxidation catalyst comprises the following steps:

[0011] S1 raw material mixing, according to the formula ratio of the honeycomb metal oxide composite carrier, TiO2, Pt, V2O5, Al2O3 and SiO2 raw materials are mixed evenly;

[0012] S2 molding, adding the mixed raw materials to deionized water, adjusting the pH to 2-4, standing for 24 hours, filtering, extruding, and cutting to form a honeycomb-shaped initial dry embryo module;

[0013] S3 drying, drying the formed initial dry embryo module at 50-60° C. for 48-60 hours;

[0014] S4 calcination, calcining the dried embryo module at 520-560° C. for 6-8 hours to form a stable metal oxide structure;

[0015] S5 impregnation, the calcined honeycomb metal oxide composite carrier is impregnated twice in a palladium salt solution. The first impregnation uses a 0.5% to 1.4% palladium nitrate solution with a pH value of 2 to 3. After impregnation, the mass of the dry embryo module increases by 28% to 34%. The second impregnation uses a 0.1% to 0.4% palladium nitrate solution with a pH value of 4 to 5. After impregnation, the mass of the dry embryo module increases by 15% to 23%;

[0016] S6 drying and activation, drying the impregnated dry embryo module at 50-60°C for 72 hours, and then performing a calcination activation treatment at 520-560°C for 6-8 hours;

[0017] S7 inspection is to conduct a performance inspection on the prepared catalyst to ensure that it meets the requirements of catalytic activity and selectivity.

[0018] Preferably, the TiO2 loading is 80-85% of the total catalyst dosage.

[0019] Preferably, the support material also includes SiO2.

[0020] A preparation device of a composite metal oxide honeycomb CO oxidation catalyst, comprising:

[0021] A reactor, wherein the reactor is connected to a raw material storage device, and a flow metering unit is provided at a discharge port of the raw material storage device;

[0022] A molding unit, which is connected to the discharge port of the reactor and includes an extruder and a cutter, and extrudes the mixed raw materials and cuts them into a desired honeycomb structure;

[0023] The drying unit is located on one side of the molding unit and has a heating function to dry the initial dry embryo module;

[0024] A calcining furnace receives the dry embryo module from the drying unit, the calcining furnace comprises a furnace body, a support frame is provided at the bottom of the furnace body, a material port is provided at the top of the furnace body, and a material feeding and discharging device is provided at the upper end of the material port;

[0025] An impregnation unit, the impregnation unit comprising an impregnation tank and a liquid circulation component;

[0026] A secondary drying unit, located on one side of the impregnation unit;

[0027] The activation furnace comprises a furnace body and a material conveying system. The furnace body is installed in a heat-insulating shell. A heating component is arranged on the outer side of the furnace body. The material conveying system can drive the impregnated dry embryo module in and out of the furnace body.

[0028] Preferably, the drying unit and the secondary drying unit both include a drying shell and a drying chamber arranged in the drying shell, a heating component is arranged in the drying shell, and an exhaust pipe is arranged on the drying shell.

[0029] Preferably, the raw material storage equipment includes a titanium dioxide storage tank, a platinum salt storage tank, a vanadium oxalate storage tank, a bauxite storage tank and a quartz ore storage tank, and the reactor is also connected to an ion water storage tank and a pH regulator.

[0030] Preferably, the reactor comprises a reactor shell, a feed port is provided at the upper end of the reactor shell, the discharge port is arranged at the bottom of the reactor shell, a reaction chamber is provided in the reactor shell, a heating chamber is provided between the reaction chamber and the reactor shell, the heating chamber is connected to the heating component, a stirring shaft is provided at the center of the reaction chamber, a stirring rod is provided on the stirring shaft, and the stirring shaft passes through the reactor shell and is connected to the stirring motor.

[0031] Preferably, a visible manhole is provided on the reactor shell.

[0032] Beneficial effects:

[0033] 1. By finely controlling the ratio of active components and carrier materials, the catalyst achieves efficient oxidation of CO at low temperatures while maintaining good selectivity and reducing side reactions. The calcination process ensures the thermal stability and mechanical strength of the catalyst, enabling it to adapt to long-term high-temperature operation.

[0034] 2. The standardized preparation process and easy regeneration characteristics further improve the economic benefits and service life of the catalyst.

[0035] 3. The preparation device of the present invention ensures high activity and selectivity of the catalyst by precisely controlling the raw material ratio, optimizing the molding process, precisely controlling the drying and calcination conditions, efficiently handling the impregnation and secondary drying steps, and performing heat treatment through an activation furnace, while taking into account environmental friendliness, energy efficiency, automated production, and production flexibility and scalability, thereby achieving an efficient, controllable, environmentally friendly and economical catalyst production process, while ensuring the consistency and high quality of the product, meeting the demand for high-performance CO oxidation catalysts in industrial applications BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic structural diagram of the preparation device of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following is a detailed description of the present invention in conjunction with the specific implementation methods and with reference to the attached drawings. Figure 1 , the present invention is further described in detail. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concept of the present invention.

[0038] The present invention provides a composite metal oxide honeycomb CO oxidation catalyst,

[0039] The active components of the honeycomb CO oxidation catalyst include Pt and a Pd metal coating loaded on the surface of a composite carrier, the Pt loading is 0.1-2% of the total catalyst dosage, the Pd metal coating loading is 0.1-2% of the total catalyst dosage, the carrier of the honeycomb CO oxidation catalyst is TiO2 and Al2O3, the TiO2 loading is 80-85% of the total catalyst dosage, and the carrier material also includes SiO2. The selectivity enhancer of the honeycomb CO oxidation catalyst is V2O5, and the content of V2O5 is 3-5%;

[0040] The preparation method of the composite metal oxide honeycomb CO oxidation catalyst comprises the following steps:

[0041] S1 raw material mixing, according to the formula ratio of the honeycomb metal oxide composite carrier, TiO2, Pt, V2O5, Al2O3 and SiO2 raw materials are evenly mixed, the raw material of TiO2 is titanium dioxide, the raw material of Pt is platinum salt, the raw material of V2O5 is vanadium oxalate, the raw material of Al2O3 is bauxite, and the raw material of SiO2 is quartz ore;

[0042] S2 molding, adding the mixed raw materials to deionized water, adjusting the pH to 2-4, standing for 24 hours, filtering, extruding, and cutting to form a honeycomb-shaped initial dry embryo module;

[0043] S3 drying, drying the formed initial dry embryo module at 50-60° C. for 48-60 hours;

[0044] S4 calcination, calcining the dried embryo module at 520-560° C. for 6-8 hours to form a stable metal oxide structure;

[0045] S5 impregnation, the calcined honeycomb metal oxide composite carrier is impregnated twice in a palladium salt solution. The first impregnation uses a 0.5% to 1.4% palladium nitrate solution with a pH value of 2 to 3. After impregnation, the mass of the dry embryo module increases by 28% to 34%. The second impregnation uses a 0.1% to 0.4% palladium nitrate solution with a pH value of 4 to 5. After impregnation, the mass of the dry embryo module increases by 15% to 23%;

[0046] S6 drying and activation, drying the impregnated dry embryo module at 50-60°C for 72 hours, and then performing a calcination activation treatment at 520-560°C for 6-8 hours;

[0047] S7 inspection is to conduct a performance inspection on the prepared catalyst to ensure that it meets the requirements of catalytic activity and selectivity.

[0048] Example 1

[0049] The present invention provides a composite metal oxide honeycomb CO oxidation catalyst,

[0050] The active components of the honeycomb CO oxidation catalyst include Pt and a Pd metal coating loaded on the surface of a composite carrier, the Pt loading is 0.1% of the total catalyst dosage, the Pd metal coating loading is 0.1% of the total catalyst dosage, the carrier of the honeycomb CO oxidation catalyst is TiO2 and Al2O3, the TiO2 loading is 80% of the total catalyst dosage, and the carrier material also includes SiO2. The selectivity enhancer of the honeycomb CO oxidation catalyst is V2O5, and the content of V2O5 is 3%;

[0051] The preparation method of the composite metal oxide honeycomb CO oxidation catalyst comprises the following steps:

[0052] S1 raw material mixing, according to the formula ratio of the honeycomb metal oxide composite carrier, TiO2, Pt, V2O5, Al2O3 and SiO2 raw materials are evenly mixed, the raw material of TiO2 is titanium dioxide, the raw material of Pt is platinum salt, the raw material of V2O5 is vanadium oxalate, the raw material of Al2O3 is bauxite, and the raw material of SiO2 is quartz ore;

[0053] S2 molding, adding the mixed raw materials to deionized water, adjusting the pH to 2, standing for 24 hours, filtering, extruding, and cutting to form a honeycomb initial dry embryo module;

[0054] S3 drying, drying the formed initial dry embryo module at 50° C. for 48 hours;

[0055] S4 calcination, calcining the dried embryo module at 520° C. for 6 hours to form a stable metal oxide structure;

[0056] S5 impregnation, the calcined honeycomb metal oxide composite support is impregnated twice in a palladium salt solution, the first impregnation uses a 0.5% palladium nitrate solution with a pH value of 3, and the mass of the dry embryo module increases by 28% to 34% after impregnation, and the second impregnation uses a 0.1% palladium nitrate solution with a pH value of 5, and the mass of the dry embryo module increases by 15% after impregnation;

[0057] S6 drying and activation, the impregnated dry embryo module is dried at 50°C for 72 hours, and then calcined and activated at 520°C for 6 hours;

[0058] S7 inspection is to conduct a performance inspection on the prepared catalyst to ensure that it meets the requirements of catalytic activity and selectivity.

[0059] Example 2

[0060] The present invention provides a composite metal oxide honeycomb CO oxidation catalyst,

[0061] The active components of the honeycomb CO oxidation catalyst include Pt and a Pd metal coating loaded on the surface of a composite carrier, the Pt loading is 1% of the total catalyst dosage, the Pd metal coating loading is 1% of the total catalyst dosage, the carrier of the honeycomb CO oxidation catalyst is TiO2 and Al2O3, the TiO2 loading is 81% of the total catalyst dosage, and the carrier material also includes SiO2. The selectivity enhancer of the honeycomb CO oxidation catalyst is V2O5, and the content of V2O5 is 3.5%;

[0062] The preparation method of the composite metal oxide honeycomb CO oxidation catalyst comprises the following steps:

[0063] S1 raw material mixing, according to the formula ratio of the honeycomb metal oxide composite carrier, TiO2, Pt, V2O5, Al2O3 and SiO2 raw materials are evenly mixed, the raw material of TiO2 is titanium dioxide, the raw material of Pt is platinum salt, the raw material of V2O5 is vanadium oxalate, the raw material of Al2O3 is bauxite, and the raw material of SiO2 is quartz ore;

[0064] S2 molding, adding the mixed raw materials to deionized water, adjusting the pH to 2.5, standing for 24 hours, filtering, extruding, and cutting to form a honeycomb-shaped initial dry embryo module;

[0065] S3 drying, drying the formed initial dry embryo module at 55° C. for 55 hours;

[0066] S4 calcination, calcining the dried embryo module at 540° C. for 7 hours to form a stable metal oxide structure;

[0067] S5 impregnation, the calcined honeycomb metal oxide composite support is impregnated twice in a palladium salt solution. The first impregnation uses a 1% palladium nitrate solution with a pH value of 2.5, and the mass of the dry embryo module increases by 30% after impregnation. The second impregnation uses a 0.25% palladium nitrate solution with a pH value of 4.5, and the mass of the dry embryo module increases by 20% after impregnation;

[0068] S6 drying and activation, the impregnated dry embryo module is dried at 55°C for 72 hours, and then calcined and activated at 560°C for 7 hours;

[0069] S7 inspection is to conduct a performance inspection on the prepared catalyst to ensure that it meets the requirements of catalytic activity and selectivity.

[0070] Example 3

[0071] The present invention provides a composite metal oxide honeycomb CO oxidation catalyst,

[0072] The active components of the honeycomb CO oxidation catalyst include Pt and a Pd metal coating loaded on the surface of a composite carrier, wherein the Pt loading is 2% of the total catalyst dosage, and the Pd metal coating loading is 2% of the total catalyst dosage; the carrier of the honeycomb CO oxidation catalyst is TiO2 and Al2O3, wherein the TiO2 loading is 85% of the total catalyst dosage, and the carrier material also includes SiO2. The selectivity enhancer of the honeycomb CO oxidation catalyst is V2O5, and the content of V2O5 is 5%;

[0073] The preparation method of the composite metal oxide honeycomb CO oxidation catalyst comprises the following steps:

[0074] S1 raw material mixing, according to the formula ratio of the honeycomb metal oxide composite carrier, TiO2, Pt, V2O5, Al2O3 and SiO2 raw materials are evenly mixed, the raw material of TiO2 is titanium dioxide, the raw material of Pt is platinum salt, the raw material of V2O5 is vanadium oxalate, the raw material of Al2O3 is bauxite, and the raw material of SiO2 is quartz ore;

[0075] S2 molding, adding the mixed raw materials to deionized water, adjusting the pH to 4, standing for 24 hours, filtering, extruding, and cutting to form a honeycomb initial dry embryo module;

[0076] S3 drying, drying the formed initial dry embryo module at 60° C. for 60 hours;

[0077] S4 calcination, calcining the dried embryo module at 560° C. for 8 hours to form a stable metal oxide structure;

[0078] S5 impregnation, the calcined honeycomb metal oxide composite support is impregnated twice in a palladium salt solution. The first impregnation uses a 1.4% palladium nitrate solution with a pH value of 2, and the mass of the dry embryo module increases by 34% after impregnation. The second impregnation uses a 0.4% palladium nitrate solution with a pH value of 4, and the mass of the dry embryo module increases by 23% after impregnation;

[0079] S6 drying and activation, the impregnated dry embryo module is dried at 60°C for 72 hours, and then calcined and activated at 560°C for 8 hours;

[0080] S7 inspection is to conduct a performance inspection on the prepared catalyst to ensure that it meets the requirements of catalytic activity and selectivity.

[0081] By precisely controlling the content and ratio of Pt, V2O5 and Pd, the catalyst can achieve efficient CO oxidation at lower temperatures while reducing the occurrence of side reactions. The Pd metal coating acts as the active center of the catalyst, providing efficient CO oxidation active sites. The calcination step is carried out at 520-560°C, which helps to form a stable metal oxide structure, which not only enhances the thermal stability of the catalyst, enabling it to maintain performance under long-term high-temperature operating conditions, but also improves the mechanical strength, making the catalyst more durable and convenient for long-term operation in industrial applications. This design makes the catalyst more economically attractive and suitable for large-scale production and application.

[0082] The introduction of Pd metal coating improves the catalyst's resistance to potentially toxic substances such as sulfur and water vapor, enabling it to maintain stable catalytic performance in more complex and harsh environments, which is particularly important for gas purification in practical industrial applications. The consistency and repeatability of the catalyst can be ensured through standardized preparation steps, including raw material mixing, molding, drying, calcination, impregnation, drying and activation. This controllable preparation process facilitates large-scale production while ensuring that each catalyst product meets the predetermined performance requirements.

[0083] A preparation device of a composite metal oxide honeycomb CO oxidation catalyst, comprising:

[0084] A reactor 14, wherein the reactor 14 is connected to a raw material storage device, a flow metering unit is provided at a discharge port of the raw material storage device, the raw material storage device comprises a titanium dioxide storage tank 1, a platinum salt storage tank 2, a vanadium oxalate storage tank 3, a bauxite storage tank 4 and a quartz ore storage tank 5, and the reactor 14 is also connected to an ion water storage tank 13 and a pH regulator;

[0085] A molding unit 18, the molding unit 18 is connected to the discharge port 12 of the reactor 14, and the molding unit 18 includes an extruder and a cutter, which extrudes the mixed raw materials and cuts them into a desired honeycomb structure. This continuous molding process helps to improve production efficiency and shape consistency of the catalyst;

[0086] The drying unit is located on one side of the forming unit 18 and has a heating function to dry the initial dry embryo module and remove moisture from the formed dry embryo module;

[0087] A calcining furnace receives the dry embryo module from the drying unit. The calcining furnace 8 comprises a furnace body, a support frame is provided at the bottom of the furnace body, a material port is provided at the top of the furnace body, and a material loading and discharging device 7 is provided at the upper end of the material port. The dry embryo module is placed in the furnace body for calcination to form a stable metal oxide structure;

[0088] An impregnation unit 17, comprising an impregnation tank and a liquid circulation component, for impregnating the calcined metal oxide structure in a salt solution containing a precious metal;

[0089] A secondary drying unit 16, located on one side of the impregnation unit 17, to remove moisture from the impregnation liquid and prepare for the activation step;

[0090] The activation furnace 15 comprises a furnace body and a material conveying system. The furnace body is installed in a heat-insulating shell. A heating component is arranged on the outer side of the furnace body. The material conveying system can drive the impregnated dry embryo module in and out of the furnace body.

[0091] The drying unit 9 and the secondary drying unit 16 both include a drying housing 21 and a drying chamber 19 disposed in the drying housing 21 . A heating component is disposed in the drying housing 21 , and an exhaust pipe 20 is disposed on the drying housing 21 .

[0092] The reactor 14 includes a reactor shell, a feed port is provided at the upper end of the reactor shell, a discharge port 12 is provided at the bottom of the reactor shell, a reaction chamber is provided in the reactor shell, a heating chamber is provided between the reaction chamber and the reactor shell, the heating chamber is connected to a heating component, a stirring shaft 10 is provided at the center of the reaction chamber, a stirring rod 11 is provided on the stirring shaft 10, and the stirring shaft 10 passes through the reactor shell and is connected to the stirring motor 6. A visible manhole is provided on the reactor shell.

[0093] The invention improves the uniformity of raw material mixing, and the flow metering unit ensures the accurate addition of each raw material, avoiding errors caused by human factors, which is crucial for the consistency and repeatability of catalyst performance. The design of the stirring shaft and stirring rod in the reactor helps to evenly distribute the raw materials during the mixing process, reduce local concentration deviations, and thus improve the uniformity and activity of the catalyst.

[0094] The present invention optimizes the molding process. The design of the integrated extrusion and cutting machine reduces the intermediate links and directly transports the raw materials from the reactor to the molding unit, thereby reducing the loss and pollution of the raw materials during transportation. The precise molding of the honeycomb structure helps to increase the specific surface area and gas flowability of the catalyst, which is of great significance for improving catalytic efficiency and reducing pressure drop.

[0095] The present invention precisely controls the drying and calcining conditions. The heating function of the drying unit and the calcining furnace can precisely control the temperature, which is essential for removing moisture and forming the microstructure of the catalyst. The design of the calcining furnace allows for long-term heat treatment at high temperatures, which helps the crystal phase transformation of the metal oxide in the catalyst and the repair of lattice defects, thereby improving the thermal stability and activity of the catalyst.

[0096] The present invention has an efficient treatment of impregnation and secondary drying. The design of the impregnation unit enables the catalyst carrier to uniformly adsorb the palladium salt solution, which is essential for forming a uniform metal coating and improving catalytic activity. The secondary drying unit helps to remove the residual moisture during the impregnation process, creating conditions for the subsequent activation step. The heat treatment effect of the activation furnace, the high temperature treatment of the activation furnace helps to disperse the metal particles on the catalyst surface and form active sites, which plays an important role in improving the catalytic activity and selectivity of the catalyst.

[0097] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0098] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite metal oxide honeycomb CO oxidation catalyst, characterized in that: The active components of the honeycomb CO oxidation catalyst include Pt and a Pd metal coating loaded on the surface of a composite carrier, wherein the Pt loading is 0.1-2% of the total catalyst dosage, and the Pd metal coating loading is 0.1-2% of the total catalyst dosage. The carrier of the honeycomb CO oxidation catalyst is TiO2 and Al2O3, and the selectivity enhancer of the honeycomb CO oxidation catalyst is V2O5, and the V2O5 content is 3-5%; The preparation method of the composite metal oxide honeycomb CO oxidation catalyst comprises the following steps: S1 raw material mixing, according to the formula ratio of the honeycomb metal oxide composite carrier, the TiO2, Pt, V2O5, Al2O3 and SiO2 raw materials are mixed evenly; S2 molding, adding the mixed raw materials to deionized water, adjusting the pH to 2-4, standing for 24 hours, filtering, extruding, and cutting to form a honeycomb-shaped initial dry embryo module; S3 drying, drying the formed initial dry embryo module at 50-60° C. for 48-60 hours; S4 calcination, calcining the dried embryo module at 520-560° C. for 6-8 hours to form a stable metal oxide structure; S5 impregnation, the calcined honeycomb metal oxide composite support is impregnated twice in a palladium salt solution, the first impregnation uses a 0.5% to 1.4% palladium nitrate solution, the pH value is 2 to 3, and the mass of the dry embryo module increases by 28% to 34% after impregnation. The second impregnation uses a 0.1% to 0.4% palladium nitrate solution, the pH value is 4 to 5, and the mass of the dry embryo module increases by 15% to 23% after impregnation; S6 drying and activation, drying the impregnated dry embryo module at 50-60°C for 72 hours, and then performing a calcination activation treatment at 520-560°C for 6-8 hours; S7 inspection is to conduct a performance inspection on the prepared catalyst to ensure that it meets the requirements of catalytic activity and selectivity.

2. A composite metal oxide honeycomb CO oxidation catalyst according to claim 1, characterized in that: The TiO2 loading is 80-85% of the total catalyst dosage.

3. The composite metal oxide honeycomb CO oxidation catalyst according to claim 1, characterized in that: Support materials also include SiO2.

4. A preparation device for a composite metal oxide honeycomb CO oxidation catalyst as claimed in claim 1, characterized in that: include: A reactor, wherein the reactor is connected to a raw material storage device, and a flow metering unit is provided at a discharge port of the raw material storage device; A molding unit, which is connected to the discharge port of the reactor and includes an extruder and a cutter, and extrudes the mixed raw materials and cuts them into a desired honeycomb structure; The drying unit is located on one side of the molding unit and has a heating function to dry the initial dry embryo module; A calcining furnace receives the dry embryo module from the drying unit, the calcining furnace comprises a furnace body, a support frame is provided at the bottom of the furnace body, a material port is provided at the top of the furnace body, and a material feeding and discharging device is provided at the upper end of the material port; An impregnation unit, the impregnation unit comprising an impregnation tank and a liquid circulation component; A secondary drying unit, located on one side of the impregnation unit; The activation furnace comprises a furnace body and a material conveying system. The furnace body is installed in a heat-insulating shell. A heating component is arranged on the outer side of the furnace body. The material conveying system can drive the impregnated dry embryo module in and out of the furnace body.

5. The preparation device of a composite metal oxide honeycomb CO oxidation catalyst according to claim 4, characterized in that: The drying unit and the secondary drying unit both include a drying shell and a drying chamber arranged in the drying shell. A heating component is arranged in the drying shell, and an exhaust pipe is arranged on the drying shell.

6. The preparation device of a composite metal oxide honeycomb CO oxidation catalyst according to claim 4, characterized in that: The raw material storage equipment includes a titanium dioxide storage tank, a platinum salt storage tank, a vanadyl oxalate storage tank, a bauxite storage tank and a quartz ore storage tank, and the reactor is also connected with an ion water storage tank and a pH regulator.

7. The preparation device of a composite metal oxide honeycomb CO oxidation catalyst according to claim 4, characterized in that: The reactor comprises a reactor shell, a feed port is arranged at the upper end of the reactor shell, a discharge port is arranged at the bottom of the reactor shell, a reaction chamber is arranged in the reactor shell, a heating chamber is arranged between the reaction chamber and the reactor shell, the heating chamber is connected to a heating component, a stirring shaft is arranged at the center of the reaction chamber, a stirring rod is arranged on the stirring shaft, and the stirring shaft passes through the reactor shell and is connected to a stirring motor.

8. The preparation device of a composite metal oxide honeycomb CO oxidation catalyst according to claim 7, characterized in that: The reactor shell is provided with a visible manhole.

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