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Method for preparing carbon-supported high-activity gold or gold-platinum alloy or gold-core platinum-shell structural nano catalyst

A high-activity gold and platinum alloy technology, applied in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. High rate, simple process, enhanced interaction effect

Inactive Publication Date: 2010-11-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has the problems of complex process and difficult control;

Method used

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  • Method for preparing carbon-supported high-activity gold or gold-platinum alloy or gold-core platinum-shell structural nano catalyst
  • Method for preparing carbon-supported high-activity gold or gold-platinum alloy or gold-core platinum-shell structural nano catalyst
  • Method for preparing carbon-supported high-activity gold or gold-platinum alloy or gold-core platinum-shell structural nano catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Catalyst preparation steps are as follows:

[0029] 1. Add 80ml of absolute ethanol to 0.2g of carbon black, sonicate for 1h, then add 0.2ml of modified chemical reagent thiophenol solution (analytical pure), sonicate for 0.15h, let stand for 10 days, filter, and use 50ml of secondary water After washing and vacuum drying at 60°C for 2 hours, the surface mercaptolated carbon black is obtained.

[0030] 2. Take 0.25ml of chloroauric acid aqueous solution with Au(III) content of 2wt%, add water and dilute to 50ml, add 1.5ml of 1wt% polyvinylpyrrolidone as protective agent, then add 2ml of 0.1wt% sodium borohydride as reducing agent , stirred for 0.25h, and the reaction temperature was 10°C to obtain a gold colloidal solution.

[0031] 3. Add 0.1 g of the carbon black obtained in step 1 to 10 ml of the gold colloid solution in step 2, sonicate for 0.15 h, stir for 24 h, filter, and wash with secondary water until no detectable Cl - , dried at 60° C. for 2 hours to obtain...

Embodiment 2

[0033] Catalyst preparation steps are as follows:

[0034]1. Add 100ml of absolute ethanol to 0.2g of carbon black, sonicate for 1h, then add 0.2ml of modified chemical reagent thiophenol solution (analytical pure), sonicate for 0.15h, let stand for 7 days, filter, and use 50ml of secondary water After washing and vacuum drying at 60°C for 2 hours, the surface mercaptolated carbon black is obtained.

[0035] 2. Take 0.25ml of chloroauric acid aqueous solution with 2wt% Au(III) content and add water to dilute to 50ml, add 1.5ml of 1wt% polyvinylpyrrolidone as protective agent, then add 2ml of 0.1wt% sodium borohydride as reducing agent, After stirring for 0.25 h, the reaction temperature was 25° C. to obtain a gold colloidal solution.

[0036] 3. Weigh 0.005g of the carbon black obtained in step 1 and add it to 33ml of the gold colloid solution in step 2, sonicate for 0.15h, stir for 24h, filter, and wash with secondary water until no detectable Cl - , dried under vacuum at 6...

Embodiment 3

[0038] Catalyst preparation steps are as follows:

[0039] 1. Add 10ml of absolute ethanol to 0.2g of carbon black, sonicate for 1h, then add 0.1ml of modified chemical reagent thiophenol solution (analytical pure), sonicate for 0.15h, let stand for 5 days, filter, and use 50ml of secondary water After washing and vacuum drying at 60°C for 2 hours, the surface mercaptolated carbon black is obtained.

[0040] 2. Get Au(III) content and be that 0.5ml of chloroauric acid aqueous solution of 2wt% adds water and dilutes to 100ml, adds 1% polyvinylpyrrolidone 3ml to make protecting agent, then adds 0.1wt% sodium borohydride 4ml to make reducing agent, After stirring for 0.25 h, the reaction temperature was 30° C. to obtain a gold colloidal solution.

[0041] 3. Add 40ml of the gold colloid solution in step 2 to 0.016g of the carbon black obtained in step 1, sonicate for 0.15h, stir for 24h, filter, and wash with secondary water until no detectable Cl - , dried under vacuum at 60° ...

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Abstract

The invention discloses a method for preparing a carbon-supported high-activity gold or gold-platinum alloy or gold-core platinum-shell structural nano catalyst. The supporter of the catalyst is carbon black, and the active ingredient is gold or gold-platinum alloy or gold-core platinum-shell structural nano particles. The method is characterized by comprising the following steps of: modifying porous carbon by using a self-assembly method and using phi-phi bonds of a modifying chemical reagent to obtain a mercapto functionalized carbon black supporter, and depositing the gold or gold-platinum alloy or gold-core platinum-shell structural nano particles on the surface of the mercapto functionalized carbon black to obtain the gold or gold-platinum alloy or gold-core platinum-shell structural nano carbon-supported catalyst with high activity. The catalyst obtained by the method has high gold load factor; the load of the gold is controllable; the gold-carbon catalyst containing 1 to 64 mass percent of gold can be prepared; the catalyst has high activity, the size distribution of the gold nano particles is uniform and can be controlled, and the gold nano particles are connected with the porous carbon through the chemical bonds containing conductive benzene rings so as to enhance the interaction of the gold nano particles and the carbon; and the method has the advantages of low cost, simple process and low equipment requirement, and has good industrial application prospect.

Description

technical field [0001] The present invention relates to the preparation of a new, economical, simple and industrially-realizable high-activity carbon-supported gold-based composite nanocatalyst, specifically a method for preparing a carbon-supported gold-based composite nanocatalyst by using mercapto-functionalized carbon black; Background technique [0002] Gold has historically been considered to be chemically inert and far less reactive than platinum group metals in terms of catalytic performance. Since Huruta (M.Haruta et al, J.Catal.1989, 115, 301) discovered in 1989 that highly dispersed nano-gold has high low-temperature CO catalytic oxidation activity, the catalytic effect of nano-gold has become a research topic in recent years. hot spot. At present, nano-gold catalysts have shown broad application prospects in fields such as fuel cells, chemical processes, pollution and emission control, and bioengineering (G.C.Bond, D.T.Thompson, Catal.Rev.-Sci.Eng., 1999, 41(3 ...

Claims

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Application Information

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IPC IPC(8): B01J31/28B01J31/26B01J35/02
Inventor 杨喜昆徐洋洋温河莉段建军
Owner KUNMING UNIV OF SCI & TECH
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