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Cerium basis composite oxides doped precious metal integer catalyzer and method of manufacturing the same

A technology of composite oxides and monolithic catalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of affecting catalytic activity, complex preparation process, and reducing Catalytic activity and other issues, to achieve the effect of high effective utilization, good catalytic performance and simple preparation process

Inactive Publication Date: 2008-01-23
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to aim at the Al of existing catalytic combustion monolithic catalyst 2 o 3 The process of coating preparation process is complicated and the cycle is long; additive powder, γ-Al 2 o 3 The bonding strength between the coating and the carrier is low, and it is easy to crack and fall off, which directly affects the catalytic activity. At high temperature, the added oxide additive powder is easy to combine with Al 2 o 3 The coating undergoes a solid-state reaction to generate spinel compounds, which greatly reduces the shortcomings of catalytic activity; and prepares Pt / Ce for J.R.Gonzalez-Velasco 0.68 Zr 0.32 o 2 The preparation process of the monolithic catalyst method is complicated, and the coating has the disadvantage of cracking at high temperature, and a cerium-based composite oxide doped noble metal monolith with high catalytic activity, high thermal stability and high bonding strength is provided. Catalyst and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of impregnation solution:

[0033] a. Prepare the precursor solution of noble metal active components, and weigh 1.159g PdCl 2 , add 5.0mL of 1.0mol·L -1 Dissolve dilute hydrochloric acid to form H with a concentration of 6.954g / L 2 PdCl 4 solution;

[0034] b. Weigh 3.729g Ce(NO 3 ) 3 ·6H 2 O(AR), 0.922g Zr(NO 3 ) 4 ·5H 2 O(AR), add 11.0mL of deionized water to dissolve, and make a mixed solution of soluble cerium salt and soluble metal zirconium salt;

[0035]c, add the citric acid (AR) of 3.383g in above-mentioned solution, stir;

[0036] d. Heat the above solution in a water bath at 80°C, add 1.8mL of 95% ethanol dispersant; after the dispersion is complete, add 0.96g of polyethylene glycol (molecular weight M=10000) nonionic surfactant; After the agent is completely dissolved, take 6.954g / L of H 2 PdCl 4 Solution 4.2mL was added to the solution; the whole step was carried out under constant stirring;

[0037] e. Heat the above solution...

Embodiment 2

[0051] (1) Preparation of impregnation solution:

[0052] a, preparation of noble metal active component precursor solution, H 2 PdCl 4 Solution is prepared by the method in embodiment 1, and concentration is 6.954g / L;

[0053] b. Weigh 2.068g Ce(NO 3 ) 3 ·6H 2 O(AR), 3.067g Zr(NO 3 ) 4 ·5H 2 O(AR), add 11.0mL of deionized water to dissolve, and make a mixed solution of soluble cerium salt and soluble metal zirconium salt;

[0054] c, add the citric acid (AR) of 3.752g in above-mentioned solution, stir;

[0055] d. Heat the above solution in a water bath at 80°C, add 1.8mL of 95% ethanol dispersant; after the dispersion is complete, add 0.96g of polyethylene glycol (molecular weight M=10000) nonionic surfactant; After the agent is completely dissolved, take 6.954g / L of H 2 PdCl 4 Solution 4.1mL was added to the solution; the whole step was carried out under constant stirring;

[0056] e. Heat the above solution in a water bath at 80° C. and stir for 5 minutes to ob...

Embodiment 3

[0067] (1) Preparation of impregnation solution:

[0068] a, preparation of noble metal active component precursor solution, H 2 PdCl 4 Solution is prepared by the method in embodiment 1, and concentration is 6.954g / L;

[0069] b. Weigh 3.557g Ce(NO 3 ) 3 ·6H 2 O(AR), 0.879g Zr(NO 3 ) 4 ·5H 2 O(AR), add 11.0mL of deionized water to dissolve, and make a mixed solution of soluble cerium salt and soluble metal zirconium salt;

[0070] c, add the citric acid (AR) of 3.228g in above-mentioned solution, stir;

[0071] d. Heat the above solution in a water bath at 80°C, and add 1.8mL of 95% ethanol dispersant. After dispersing, add 0.96g polyethylene glycol (molecular weight M=10000) non-ionic surfactant; After surfactant dissolves completely, get 6.954g / L H 2 PdCl 4 Solution 4.0mL was added to the solution; the whole step was carried out under constant stirring;

[0072] e. Heat the above solution in a water bath at 80° C. and stir for 5 minutes to obtain an impregnating...

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PUM

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Abstract

The invention is a ceric pyridyl compound oxide mixing with precious metal whole catalyst used for organic waste gas catalyzing burning purifying process and the preparation method, which aims to the defects of existing Pt / Ce0.68Zr0.32O2 whole catalyst preparation method with complicate preparation technique and chap on coating under high temperature, to provide a ceric pyridyl compound oxide mixing with precious metal whole catalyst with high catalyzing activity, heat stability and integration intensity and the preparation method. The catalyst comprises honeycomb ceramics carrier, addition agent and active component, wherein, the honeycomb ceramics carrier is cordierite honeycomb ceramics, the addition agent is ceric pyridyl compound oxide with the chemical formula CexM1-xO Delta, the active component is one or two of precious metal Pd and Pt. The preparation method comprises preparing soakage solution and the coating of the soakage solution on the honeycomb ceramics carrier two procedures.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a cerium-based composite oxide-doped noble metal monolithic catalyst for catalytic combustion purification treatment of organic waste gas and a preparation method thereof. Background technique [0002] The organic waste gas discharged from petroleum refining, petrochemical industry, industrial solvent production, special chemical production, paint and coating production, rubber production, metal enameled wire production, etc. is one of the main sources of air pollution. Organic waste gas mainly includes hydrocarbons, oxygen hydrocarbons, halogenated hydrocarbons, nitrogen hydrocarbons and sulfur hydrocarbons. If they are directly discharged into the atmosphere without treatment, they will cause serious environmental pollution. Catalytic combustion method is one of the most effective ways to eliminate organic waste gas pollution. It is under the action of a catal...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01D53/44
Inventor 赵雷洪张庆豹谢云龙罗孟飞岳雷
Owner ZHEJIANG NORMAL UNIVERSITY
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