Preparation method of CeO2 high-dispersion supported copper oxide-based catalyst
By using aminoalkoxysilane coupling agent to promote the anchoring loading of copper-based active components on CeO2 carrier, a highly dispersed copper oxide-based catalyst was prepared, which solved the problem of low CO removal efficiency of the catalyst under hydrogen-rich conditions and achieved high efficiency, stability and wide application of the catalyst.
Patent Information
- Application Number
- CN202510702034.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-28
- Publication Date
- 2025-09-16
AI Technical Summary
Existing catalysts have difficulty effectively removing carbon monoxide (CO) impurities under hydrogen-rich conditions, affecting the operating efficiency and service life of fuel cells. In addition, existing preparation methods fail to effectively regulate the dispersibility and carrier interaction of copper oxide-based catalysts.
Aminoalkoxysilane coupling agent was used to promote the anchoring loading of copper-based active components on CeO2 carrier. CeO2 nanosheets were formed by hydrothermal treatment and calcination, and combined with alkali treatment to prepare highly dispersed copper oxide-based catalyst.
The activity and stability of the catalyst are improved, and it can efficiently catalyze the oxidation reaction of CO under hydrogen-rich conditions. It is suitable for a variety of reaction systems including CO preferential oxidation.
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Figure CN120644209A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the field of energy chemical technology / catalysis, and relates to a method for preparing a CeO2 highly dispersed loaded copper oxide-based catalyst, and more specifically to a method for preparing a CeO2 highly dispersed loaded copper oxide-based catalyst that can be used for the preferential oxidation reaction of CO under hydrogen-rich conditions. Background Art
[0002] Hydrogen fuel cells can convert the chemical energy of hydrogen into electrical energy. They have the advantages of high energy conversion efficiency and almost no pollution, and are considered to be an effective way to solve the problem of carbon emissions. The green production, storage and transportation of hydrogen are the "bottleneck" of the hydrogen energy industry. Methanol is a good hydrogen carrier, and methanol hydrogen storage can achieve safe and low-cost storage and transportation of hydrogen. The large output of methanol, especially the development of green methanol in recent years, has promoted the development and application of methanol-hydrogen coupled fuel cells. The hydrogen required for the fuel cell system comes from the methanol reforming reaction, which is accompanied by a small amount of carbon monoxide (CO) impurities, which can easily cause poisoning of the precious metal electrodes of the fuel cell, affecting the working efficiency and service life of the fuel cell.
[0003] In order to remove CO from hydrogen-rich gas, in addition to palladium membrane purification and pressure swing adsorption (PSA) physical methods, catalytic conversion of CO is also an effective technical means, such as CO selective oxidation, CO selective methanation, etc. Among them, the key to CO catalytic conversion technology is the efficiency and stability of the catalytic material, and the development and research of efficient and stable catalysts is a hot topic. Cerium oxide-supported copper-based catalysts are good CO selective oxidation reaction catalysts and are used to remove CO from hydrogen-rich gas. Even if the catalyst contains a carrier and active component of the same element, the morphology of the carrier, the morphology of the active component and its dispersion on the carrier, and the interaction between the carrier and the active component all have a great influence on the catalytic activity and stability. Therefore, constructing and regulating the catalyst structure through specific methods is conducive to promoting the improvement of catalyst performance and the expansion of its practical application. Summary of the Invention
[0004] This invention provides a method for preparing a highly dispersed CeO2-loaded copper oxide-based catalyst. This method utilizes an aminoalkoxysilane coupling agent to facilitate the anchoring of the copper-based active component onto the CeO2 support. The preparation method is simple and controllable, suitable for regulating the formation and dispersion of the copper oxide-based active component and its composite structure with the support.
[0005] The present invention provides a method for preparing a highly dispersed CeO2-loaded copper oxide-based catalyst, which adopts the following technical solution:
[0006] The metal cerium salt is dissolved in water and placed in an ice-water bath. Ammonia water is slowly added dropwise until the solution is alkaline. The solution is separated by suction filtration and the solid layered cerium hydroxide is collected. The solid layered cerium hydroxide is dispersed in water and subjected to hydrothermal treatment. The layered CeO2 nanosheets are then centrifuged and dried to obtain layered CeO2 nanosheets. The CeO2 nanosheets are surface-modified with an aminoalkoxysilane coupling agent and impregnated and mixed with a metal copper salt aqueous solution. After calcination, the CeO2 is treated with alkali, washed with water, and dried to obtain a CeO2 highly dispersed supported copper oxide-based catalyst.
[0007] The preparation method mainly has the following characteristics:
[0008] The catalyst comprises a carrier and an active component, wherein the carrier is a CeO2 nanosheet or a metal-doped CeO2 nanosheet; and the active component is copper oxide or a metal-doped copper oxide.
[0009] The CeO2-loaded copper oxide-based catalyst has a copper oxide loading amount of 1 wt.% to 30 wt.%.
[0010] The metal cerium salt is at least one of cerium nitrate, cerium oxalate, cerium chloride and cerium sulfate; the metal copper salt is at least one of copper nitrate, copper oxalate, copper chloride and copper sulfate.
[0011] Preferably, the aminoalkoxysilane coupling agent is at least one of γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, and N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane; the amount of the aminoalkoxysilane coupling agent used accounts for 5% to 60% by mole of the carrier CeO2.
[0012] Preferably, the hydrothermal treatment temperature is 100-250°C and the time is 4-12 hours; the impregnation mixing time is 2-20 hours; the drying temperature is 60-80°C; the calcination temperature is 300-600°C and the time is 2-6 hours;
[0013] The alkali treatment uses a sodium hydroxide aqueous solution with a concentration of 1 to 3 mol / L, and the alkali treatment time is 12 to 24 hours.
[0014] Preferably, the metal-doped CeO2 nanosheets include lanthanide metal doping; the metal-doped copper oxide includes at least one metal doping selected from nickel, cobalt, manganese, platinum, gold, and ruthenium.
[0015] The CeO2 highly dispersed supported copper oxide-based catalyst can be used for the preferential oxidation of CO under hydrogen-rich conditions, with a hydrogen content of 20 vol.% to 70 vol.%.
[0016] Unlike conventional preparation methods that directly mix and calcine metallic cerium and copper salts, the method of the present invention utilizes the high surface area of layered CeO2 nanosheets, combined with the interaction of an aminoalkoxysilane coupling agent, to anchor copper salt ions to CeO2, thereby in situ forming a copper-based active component and a corresponding specific composite structure. This preparation method improves the dispersibility of copper oxide and its interaction with the support, thereby enhancing the activity and stability of the catalyst. The preparation method of the present invention can provide a highly dispersed CeO2-supported copper oxide-based catalyst suitable for CO preferential oxidation under hydrogen-rich conditions, as well as other reaction systems catalyzed by copper oxide. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0018] Figure 1 This is an SEM image of the CeO2-loaded copper oxide-based catalyst prepared by the method of the present invention. DETAILED DESCRIPTION
[0019] Below is a combination of the embodiment and Figure 1 The present invention is further described below, but the present invention is not limited to the following examples. Example 1:
[0020] 4.34 g of cerium nitrate hexahydrate was dissolved in 50 ml of deionized water, stirred evenly, and placed in an ice-water bath. Ammonia water (1.5 mol / L) was slowly added dropwise until the pH value of the solution reached 9.0. The resulting solution was filtered and separated, and the solid product was collected. It was added to 40 ml of deionized water and ultrasonicated for 10 minutes. After that, it was transferred to a 100 ml polytetrafluoroethylene-lined stainless steel reactor and reacted at 100 ° C for 12 hours. The reaction was centrifuged, and the solid product was washed with deionized water and dried at 60 ° C to obtain CeO2 nanosheets. Weigh 1.00 g of CeO2 nanosheets, ultrasonically disperse them in 15 ml of deionized water, add a certain amount of γ-aminopropyltriethoxysilane (the amount of silane is 5% by molar percentage of CeO2), stir for 20 minutes, add 0.0304 g of copper nitrate trihydrate, stir for 2 hours, and calcine at 400°C for 2 hours; after standing for 24 hours with 1 mol / L sodium hydroxide aqueous solution, wash with deionized water and dry at 60°C to obtain CeO2-loaded copper oxide catalyst (loading amount is 1 wt.%).
[0021] Example 2:
[0022] 4.34 g of cerium nitrate hexahydrate was dissolved in 50 ml of deionized water, stirred evenly, placed in an ice water bath, and ammonia water (1.5 mol / L) was slowly added dropwise until the pH value of the solution was 9.0. The obtained solution was filtered and separated, and the solid product was collected and added to 40 ml of deionized water. After ultrasonication for 10 minutes, it was transferred to a 100 ml polytetrafluoroethylene-lined stainless steel reactor and reacted at 250 ° C for 4 hours. Centrifugation was performed, and the solid product was washed with deionized water and dried at 80 ° C. The obtained product was CeO2 nanosheets; weigh 1.00 g of CeO2 nanosheets were ultrasonically dispersed in 15 ml of deionized water, and a certain amount of γ-aminopropyltriethoxysilane was added (the amount of silane was 60% by molar percentage of CeO2). After stirring for 20 minutes, 0.9112 g of copper nitrate trihydrate was added, stirred for 20 hours, and calcined at 600°C for 6 hours. After standing for 24 hours with a 3 mol / L sodium hydroxide aqueous solution, the mixture was washed with deionized water and dried at 80°C to obtain a CeO2-loaded copper oxide catalyst (loading amount was 30 wt.%).
[0023] Example 3:
[0024] 7.06 g of cerium oxalate nine hydrate was dissolved in 50 ml of deionized water, stirred evenly, placed in an ice water bath, and ammonia water (1.5 mol / L) was slowly added dropwise until the pH value of the solution was 9.0. The resulting solution was filtered and separated, and the solid product was collected and added to 40 ml of deionized water. After ultrasonication for 10 minutes, it was transferred to a 100 ml polytetrafluoroethylene-lined stainless steel reactor and reacted at 200 ° C for 8 hours. Centrifugation was performed, and the solid product was washed with deionized water and dried at 70 ° C. The obtained product was CeO2 nanosheets; 1.00 g was weighed. CeO2 nanosheets were ultrasonically dispersed in 15 ml of deionized water, and a certain amount of N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane was added (the amount of silane was 20% by mole of CeO2). After stirring for 20 minutes, 0.2132 g of copper oxalate hemihydrate was added, stirred for 20 hours, and calcined at 600°C for 4 hours. After standing for 12 hours with a 2 mol / L sodium hydroxide aqueous solution, the mixture was washed with deionized water and dried at 70°C to obtain a CeO2-loaded copper oxide catalyst (loading amount was 10 wt.%).
[0025] Example 4:
[0026] 3.72 g of cerium chloride heptahydrate was dissolved in 50 ml of deionized water, stirred evenly, placed in an ice water bath, and ammonia water (1.5 mol / L) was slowly added dropwise until the pH value of the solution was 9.0. The resulting solution was filtered and separated, and the solid product was collected and added to 40 ml of deionized water. After ultrasonication for 10 minutes, it was transferred to a 100 ml polytetrafluoroethylene-lined stainless steel reactor and reacted at 180 ° C for 8 hours. Centrifugation was performed, and the solid product was washed with deionized water and dried at 70 ° C. The obtained product was CeO2 nanosheets; 1.00 g was weighed. CeO2 nanosheets were ultrasonically dispersed in 15 ml of deionized water, and a certain amount of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane was added (the molar percentage of silane to CeO2 was 30%). After stirring for 20 minutes, 0.3215 g of copper chloride dihydrate was added, stirred for 20 hours, and calcined at 600°C for 4 hours. After standing for 12 hours with a 2 mol / L sodium hydroxide aqueous solution, the mixture was washed with deionized water and dried at 70°C to obtain a CeO2-loaded copper oxide catalyst (loading amount was 15 wt.%).
[0027] Example 5:
[0028] 4.05 g of cerium sulfate tetrahydrate was dissolved in 50 ml of deionized water, stirred evenly, placed in an ice-water bath, and ammonia water (1.5 mol / L) was slowly added dropwise until the pH value of the solution reached 9.0. The resulting solution was filtered and separated, and the solid product was collected and added to 40 ml of deionized water. After ultrasonication for 10 minutes, it was transferred to a 100 ml polytetrafluoroethylene-lined stainless steel reactor and reacted at 180 ° C for 8 hours. Centrifugation was performed, and the solid product was washed with deionized water and dried at 70 ° C. The obtained product is CeO2 nanosheets; Take 1.00 g of CeO2 nanosheets, ultrasonically disperse them in 15 ml of deionized water, add a certain amount of γ-aminopropyltriethoxysilane (the amount of silane is 30% by mole of CeO2), stir for 20 minutes, then add 0.3139 g of copper sulfate pentahydrate, stir for 20 hours, and calcine at 300°C for 4 hours; after standing for 12 hours with 2 mol / L sodium hydroxide aqueous solution, wash with deionized water and dry at 70°C to obtain CeO2-loaded copper oxide catalyst (loading amount is 10 wt.%).
[0029] Example 6:
[0030] 4.34 g of cerium nitrate hexahydrate and 0.346 g of lanthanum nitrate were dissolved in 50 ml of deionized water, stirred evenly, placed in an ice-water bath, and ammonia water (1.5 mol / L) was slowly added dropwise until the pH value of the solution reached 9.0. The resulting solution was filtered and separated, and the solid product was collected and added to 40 ml of deionized water. After ultrasonication for 10 minutes, it was transferred to a 100 ml polytetrafluoroethylene-lined stainless steel reactor and reacted at 180 ° C for 8 hours. The reaction was centrifuged, the solid product was washed with deionized water, and dried at 70 ° C to obtain CeO2 nanosheets; 1.00 g of C CeO2 nanosheets were ultrasonically dispersed in 15 ml of deionized water, and a certain amount of γ-aminopropyltriethoxysilane was added (the amount of silane was 30% by mole of CeO2). After stirring for 20 minutes, 0.3037 g of copper nitrate trihydrate and 0.0389 g of nickel nitrate hexahydrate were added, stirred for 20 hours, and calcined at 600°C for 6 hours; after standing for 12 hours with 2 mol / L sodium hydroxide aqueous solution, the mixture was washed with deionized water and dried at 70°C to obtain La-CeO2 loaded nickel-doped copper oxide catalyst (copper oxide loading was 10 wt.%).
[0031] Example 7:
[0032] 4.34 g of cerium nitrate hexahydrate was dissolved in 50 ml of deionized water, stirred evenly, placed in an ice-water bath, and ammonia water (1.5 mol / L) was slowly added dropwise until the pH value of the solution reached 9.0. The resulting solution was filtered and separated, and the solid product was collected and added to 40 ml of deionized water. After ultrasonication for 10 minutes, it was transferred to a 100 ml polytetrafluoroethylene-lined stainless steel reactor and reacted at 180 ° C for 8 hours. After centrifugation, the solid product was washed with deionized water and dried at 70 ° C. The obtained product was CeO2 nanosheets; 1.00 g of CeO2 was weighed. The nanosheets were ultrasonically dispersed in 15 ml of deionized water, and a certain amount of γ-aminopropyltriethoxysilane was added (the amount of silane was 30% by mole of CeO2). After stirring for 20 minutes, 0.3037 g of copper nitrate trihydrate and 0.0311 g of cobalt nitrate hexahydrate were added, stirred for 20 hours, and calcined at 600°C for 4 hours. After standing for 12 hours with a 2 mol / L sodium hydroxide aqueous solution, the mixture was washed with deionized water and dried at 70°C to obtain a CeO2-loaded cobalt-doped copper oxide catalyst (copper oxide loading was 10 wt.%).
[0033] Example 8:
[0034] 4.34 g of cerium nitrate hexahydrate was dissolved in 50 ml of deionized water, stirred evenly, placed in an ice water bath and slowly added with ammonia water (1.5 mol / L) until the pH value of the solution was 9.0. The obtained solution was filtered and separated, and the solid product was collected and added to 40 ml of deionized water. After ultrasonication for 10 minutes, it was transferred to a 100 ml polytetrafluoroethylene-lined stainless steel reactor and reacted at 180 ° C for 8 hours. Centrifugation was performed, and the solid product was washed with deionized water and dried at 70 ° C. The obtained product was CeO2 nanosheets; 1.00 g of CeO2 nanosheets was weighed and the solid product was dried at 70 ° C. Rice flakes were ultrasonically dispersed in 15 ml of deionized water, and a certain amount of γ-aminopropyltriethoxysilane was added (the amount of silane was 30% by mole of CeO2). After stirring for 20 minutes, 0.3037 g of copper nitrate trihydrate and 0.0283 g of manganese nitrate tetrahydrate were added, and the mixture was stirred for 20 hours. The mixture was calcined at 600°C for 4 hours; the mixture was allowed to stand for 12 hours with a 2 mol / L aqueous sodium hydroxide solution, washed with deionized water, and dried at 70°C to obtain a CeO2-loaded manganese-doped copper oxide catalyst (copper oxide loading was 10 wt.%).
[0035] Example 9:
[0036] 4.34 g of cerium nitrate hexahydrate was dissolved in 50 ml of deionized water, stirred evenly, placed in an ice water bath, and ammonia water (1.5 mol / L) was slowly added dropwise until the pH value of the solution was 9.0. The resulting solution was filtered and separated, and the solid product was collected and added to 40 ml of deionized water. After ultrasonication for 10 minutes, it was transferred to a 100 ml polytetrafluoroethylene-lined stainless steel reactor and reacted at 180 ° C for 8 hours. After centrifugation, the solid product was washed with deionized water and dried at 70 ° C. The obtained product was CeO2 nanosheets; 1.00 g of Ce was weighed. O2 nanosheets were ultrasonically dispersed in 15 ml of deionized water, and a certain amount of γ-aminopropyltriethoxysilane was added (the amount of silane was 30% by molar percentage of CeO2). After stirring for 20 minutes, 0.3037 g of copper nitrate trihydrate and 0.0168 g of chloroplatinic acid were added, stirred for 20 hours, and calcined at 600°C for 4 hours; after standing for 12 hours with 2 mol / L sodium hydroxide aqueous solution, the mixture was washed with deionized water and dried at 70°C to obtain a CeO2-loaded platinum-copper oxide catalyst (copper oxide loading was 10 wt.%).
[0037] Example 10:
[0038] 4.34 g of cerium nitrate hexahydrate was dissolved in 50 ml of deionized water, stirred evenly, placed in an ice water bath, and ammonia water (1.5 mol / L) was slowly added dropwise until the pH value of the solution was 9.0. The resulting solution was filtered and separated, and the solid product was collected and added to 40 ml of deionized water. After ultrasonication for 10 minutes, it was transferred to a 100 ml polytetrafluoroethylene-lined stainless steel reactor and reacted at 180 ° C for 8 hours. After centrifugation, the solid product was washed with deionized water and dried at 70 ° C. The obtained product was CeO2 nanosheets; 1.00 g of Ce was weighed. CeO2 nanosheets were ultrasonically dispersed in 15 ml of deionized water, and a certain amount of γ-aminopropyltriethoxysilane was added (the amount of silane was 30% by molar percentage of CeO2). After stirring for 20 minutes, 0.3037 g of copper nitrate trihydrate and 0.0153 g of chloroauric acid were added, stirred for 20 hours, and calcined at 600°C for 4 hours. After standing for 12 hours with a 2 mol / L aqueous sodium hydroxide solution, the mixture was washed with deionized water and dried at 70°C to obtain a CeO2-loaded gold-copper oxide catalyst (copper oxide loading was 10 wt.%).
[0039] Example 11:
[0040] 4.34 g of cerium nitrate hexahydrate was dissolved in 50 ml of deionized water, stirred evenly, placed in an ice water bath, and ammonia water (1.5 mol / L) was slowly added dropwise until the pH value of the solution was 9.0. The obtained solution was filtered and separated, and the solid product was collected and added to 40 ml of deionized water. After ultrasonication for 10 minutes, it was transferred to a 100 ml polytetrafluoroethylene-lined stainless steel reactor and reacted at 180 ° C for 8 hours. Centrifugation was performed, and the solid product was washed with deionized water and dried at 70 ° C. The obtained product was CeO2 nanosheets; 1.00 g of Ce was weighed. CeO2 nanosheets were ultrasonically dispersed in 15 ml of deionized water, and a certain amount of γ-aminopropyltriethoxysilane was added (the amount of silane was 30% by molar percentage of CeO2). After stirring for 20 minutes, 0.3037 g of copper nitrate trihydrate and 0.0164 g of ruthenium chloride were added, stirred for 20 hours, and calcined at 600°C for 4 hours. After standing for 12 hours with a 2 mol / L sodium hydroxide aqueous solution, the mixture was washed with deionized water and dried at 70°C to obtain a CeO2-loaded ruthenium-copper oxide catalyst (copper oxide loading was 10 wt.%).
[0041] Example 12:
[0042] The CeO2-supported copper oxide-based catalyst prepared by the present method was tested for its catalytic activity for CO oxidation in a hydrogen-rich atmosphere. 0.50g of the catalyst was placed in a fixed-bed reactor with a reaction gas composition of 1 vol.% CO, 2 vol.% O2, 20-70 vol.% H2, and N2 as the balance gas. The total flow rate was 100 mL / min, and the reaction temperature was 100°C or above. The results showed that the catalysts were able to catalyze CO oxidation at various hydrogen contents.
[0043] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or equivalent replacement that can be made by other skilled in the art without inventive effort falls within the scope of protection of the present invention.
Claims
1. A method for preparing a CeO2 highly dispersed supported copper oxide-based catalyst, characterized in that: The method for constructing a highly dispersed copper-based catalyst loaded on CeO2 nanosheets includes the following preparation steps: dissolving a metal cerium salt in water, placing the solution in an ice-water bath, dripping ammonia water into the cerium salt solution until the solution is alkaline, filtering and separating, collecting solid layered cerium hydroxide, dispersing the layered cerium hydroxide in water, subjecting the obtained solution to hydrothermal treatment, centrifuging, and drying to obtain layered CeO2 nanosheets; surface-modifying the CeO2 nanosheets with an aminoalkoxysilane coupling agent to achieve consistent surface functionalization to improve the dispersibility of the nanosheets, and then impregnating and mixing with a metal copper salt aqueous solution, calcining, and then subjecting the solution to alkali treatment, water washing, and drying to obtain a highly dispersed CeO2 loaded copper oxide-based catalyst.
2. The method for preparing a CeO2 highly dispersed supported copper oxide-based catalyst according to claim 1, wherein: The copper-based catalyst comprises a carrier and an active component, wherein the carrier is CeO2 nanosheets or metal-doped CeO2 nanosheets; the active component is copper oxide or metal-doped copper oxide; and the loading amount of the copper oxide is 1wt.% to 30wt.%.
3. The method for preparing a CeO2 highly dispersed supported copper oxide-based catalyst according to claim 1, wherein: The metal cerium salt is at least one of cerium nitrate, cerium oxalate, cerium chloride and cerium sulfate; the metal copper salt is at least one of copper nitrate, copper oxalate, copper chloride and copper sulfate.
4. The method for preparing a CeO2 highly dispersed supported copper oxide-based catalyst according to claim 2, wherein: The aminoalkoxysilane coupling agent is an oxysilane compound containing an amino group at the molecular chain end, including at least one of γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, and N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane; the amount of the aminoalkoxysilane coupling agent used accounts for 5% to 60% by mole of the carrier CeO2.
5. The method for preparing a CeO2 highly dispersed supported copper oxide-based catalyst according to claim 1, wherein: In the preparation steps, the hydrothermal treatment temperature is 100-250°C and the time is 4-12 hours; the impregnation mixing time is 2-20 hours; the drying temperature is 60-80°C; the calcination temperature is 300-600°C and the time is 2-6 hours; and the alkali treatment uses a sodium hydroxide aqueous solution with a concentration of 1-3 mol / L, and the alkali treatment time is 12-24 hours.
6. The carrier and active ingredient according to claim 2, characterized in that The metal-doped CeO2 nanosheets include lanthanide metal doping; the metal-doped copper oxide includes at least one metal doping selected from nickel, cobalt, manganese, platinum, gold, and ruthenium.
7. The method for preparing a CeO2 highly dispersed supported copper oxide-based catalyst according to claim 1, characterized in that: The auxiliary orientation is achieved by anchoring the metallic copper precursor on the cerium oxide support through the coordination reaction between aminoalkoxysilane and the copper-based catalyst, thereby improving the dispersion of the copper-based active component on the support.
8. The method for preparing a CeO2 highly dispersed supported copper oxide-based catalyst according to claim 1, characterized in that: The CeO2 highly dispersed supported copper oxide-based catalyst can be used for the preferential oxidation of CO under hydrogen-rich conditions, with a hydrogen content of 20 vol.% to 70 vol.%.