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Method for preparing carbon supported Au-Pt or Au-Pd catalyst

A catalyst and carbon-supported technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve local sintering of metal nanoparticles, shedding, and agglomeration of nanoparticles and other problems, to achieve good industrial application prospects, improved catalytic activity, and low cost of the method

Inactive Publication Date: 2015-01-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the catalyst is subjected to traditional high-temperature heat treatment, there will be problems such as agglomeration and growth of nanoparticles, local sintering, and metal nanoparticles falling off the surface of the carbon support.

Method used

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  • Method for preparing carbon supported Au-Pt or Au-Pd catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: The specific preparation steps of carbon-supported high-activity gold-platinum catalyst include as follows:

[0023] (1) In the mixed aqueous solution of Au(Ⅲ) content of 0.01wt% chloroauric acid and Pt(Ⅳ) content of 0.01wt% chloroplatinic acid, the mass ratio of gold: platinum is 1:0.25, and then in this solution Add polyvinylpyrrolidone (PVP) with a concentration of 1wt% as a protective agent, and then add sodium borohydride with a concentration of 0.1wt%, wherein the mass ratio of Au(Ⅲ):polyvinylpyrrolidone: sodium borohydride is 1:2: 0.1, Pt(Ⅳ): The mass ratio of polyvinylpyrrolidone: sodium borohydride is 0.25:2:0.1, stir at a speed of 60 rpm for 1 hour, and the reaction temperature is 10°C to obtain gold and platinum with a particle size of 3 to 10 nanometers Complex colloid solutions (such as figure 1 shown);

[0024] (2) Heat the gold-platinum composite colloid solution obtained in step (1) to 100oC under 2 standard atmospheric pressure (atm) and...

Embodiment 2

[0027] The specific preparation steps of the carbon-supported high-activity gold-platinum catalyst include as follows:

[0028] (1) In the mixed aqueous solution of Au(Ⅲ) content of 0.03wt% chloroauric acid and Pt(Ⅳ) content of 0.02wt% chloroplatinic acid, the mass ratio of gold: platinum is 1:2, and then in this solution Add polyvinylpyrrolidone (PVP) with a concentration of 1wt% as a protective agent, and then add potassium borohydride with a concentration of 0.1wt%, wherein the mass ratio of Au(Ⅲ): polyvinylpyrrolidone: potassium borohydride is 1:4: 0.2, Pt (Ⅳ): polyvinylpyrrolidone: potassium borohydride mass ratio is 2:4:0.2, stirred at 100 rpm for 0.8h, the reaction temperature is 40°C, and the particle size is 3-8 nanometer gold Platinum complex colloidal solution;

[0029] (2) Heat the gold-platinum composite colloid solution obtained in step (1) to 200oC under the condition of 3 standard atmospheric pressure (atm) and a microwave frequency of 2000MHz, and keep it for...

Embodiment 3

[0032] The specific preparation steps of the carbon-supported high-activity gold-platinum catalyst include as follows:

[0033] (1) In a mixed ethanol solution (95% concentration) with Au(Ⅲ) content of 0.04wt% chloroauric acid and Pt(Ⅳ) content of 0.01wt% chloroplatinic acid, the mass ratio of gold: platinum is 1: 4. Then add polyvinylpyrrolidone (PVP) with a concentration of 1wt% to this solution as a protective agent, and then add formaldehyde with a concentration of 0.1wt%, wherein the mass ratio of Au(III): polyvinylpyrrolidone: formaldehyde is 1: 5:0.5, Pt (Ⅳ): polyvinylpyrrolidone: formaldehyde mass ratio is 4:5:0.5, stirred at a speed of 300 rpm for 0.8h, the reaction temperature is 40°C, and the particle size is 3-7 nanometer gold Platinum complex colloidal solution;

[0034] (2) Heat the gold-platinum composite colloid solution obtained in step (1) to 250oC at 6 standard atmospheric pressure (atm) and a microwave frequency of 915MHz, and keep it for 6 minutes to obta...

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Abstract

The invention relates to a method for preparing a carbon supported Au-Pt or Au-Pd catalyst by modifying Au-Pt or Au-Pd bimetal nanoparticles with microwaves, belonging to the technical field of catalytic materials. High pressure and high temperature generated by microwaves in a high-pressure reaction tank are utilized to treat an Au-Pt or Au-Pd composite nano colloid synthesized by a chemical coreduction method so as to induce the modification of the Au-Pt or Au-Pd bimetal nanoparticles; and the microwave-modified bimetal nanoparticles are deposited on the surface of the carbon support, thereby obtaining the carbon supported Au-Pt or Au-Pd catalyst with high activity. The carbon supported Au-Pt or Au-Pd catalyst has high electrocatalytic activity; the supporting rate of the Au-Pt or Au-Pd bimetal is high; the supporting amount of the Au-Pt or Au-Pd is controllable; and the method can be used for preparing the carbon supported Au-Pt or Au-Pd nano catalyst of which the mass ratio of Au-Pt or Au-Pd to carbon is 1-20%. The method provided by the invention has the advantages of low cost, simple technique and low facility request, and has wide industrial application prospects.

Description

technical field [0001] The invention relates to a method for preparing carbon-loaded high-activity gold-platinum or gold-palladium catalysts by using microwave-modified gold-platinum or gold-palladium bimetallic nanoparticles, which belongs to the technical field of catalytic materials. Background technique [0002] With the rapid development of nano-preparation technology and catalytic science, some researchers have prepared bimetallic AuPt and AuPd nanoparticles with high catalytic activity from the perspective of reducing catalyst cost and improving catalyst activity and CO tolerance. Recent studies have found that the physical and chemical properties of bimetallic AuPt nanoparticles vary not only with the chemical composition of Au and Pt, but also with the microstructure of AuPt nanoparticles. For example, Zhong Chuanjian et al. (C J Zhong et al, Langmuir.2006, 22:2892) prepared a carbon-supported AuPt nanocatalyst with a mass percentage of Au of 65-85%. (Eichhorn B. e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J37/34
Inventor 杨喜昆温河莉徐洋洋段建军
Owner KUNMING UNIV OF SCI & TECH