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Method for preparing sulfhydryl anchored platinum and platinum-gold/carbon nano-tube catalyst

A technology of carbon nanotubes and mercaptolation, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., and can solve problems such as poor stability

Inactive Publication Date: 2008-11-12
CHONGQING UNIV
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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 provide a preparation method for mercapto-anchored platinum and platinum-gold / carbon nanotube catalysts for the disadvantages of poor stability of existing Pt / C catalysts

Method used

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  • Method for preparing sulfhydryl anchored platinum and platinum-gold/carbon nano-tube catalyst
  • Method for preparing sulfhydryl anchored platinum and platinum-gold/carbon nano-tube catalyst
  • Method for preparing sulfhydryl anchored platinum and platinum-gold/carbon nano-tube catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0030] (1), bromination of carbon nanotubes

[0031] Add 0.1 g of commercially available hydroxylated carbon nanotubes (Beijing Nachen Technology Co., Ltd.), 1.2 g of PBr 3 and 160 ml of acetone, ultrasonically oscillated for 10 minutes, then stirred and reacted at room temperature for 3 hours; then the mixture obtained in the reaction was centrifuged first, and then washed several times with acetone to eliminate PBr 3 Finally, centrifuge and wash with absolute ethanol, and dry at room temperature to obtain brominated carbon nanotubes.

[0032] (2), mercaptolation of carbon nanotubes

[0033] Add 0.1 gram of brominated carbon nanotubes obtained in step (1), 0.8 gram of thiourea and 160 milliliters of absolute ethanol to a 250 ml round-bottomed flask respectively. After ultrasonic oscillation for 20 minutes, stir and reflux at 60°C for 4 hours . Then the product is centrifugally separated, then centrifugally washed with absolute ethanol, and finally centrifugally washed seve...

Embodiment 2

[0041] Steps (1)-(2) are the same as steps (1)-(2) in Example 1.

[0042] (3), mercapto-anchored platinum / carbon nanotube catalyst

[0043] According to the mass ratio of mercaptolated carbon nanotubes: sodium chloroplatinate is 1: 2, take mercaptolated carbon nanotubes and sodium chloroplatinate, and use 1,5-pentanediol as a solvent to vibrate evenly under ultrasonic conditions, Then, under the protection of nitrogen or argon atmosphere, stirred and refluxed in an oil bath at 250°C for 4 hours, then cooled to room temperature, then centrifuged the product, washed, and finally treated it at 180°C in a hydrogen atmosphere for 1 hour, and the mercapto group anchored platinum / carbon nanotube catalyst.

Embodiment 3

[0045] Steps (1)-(2) are the same as steps (1)-(2) in Example 1.

[0046] (3), mercapto-anchored platinum / carbon nanotube catalyst

[0047] According to the carbon nanotubes of mercaptolation: the mass ratio of potassium chloroplatinate is 1: 2.5 to take by weighing the carbon nanotubes and potassium chloroplatinate of mercaptolation, take ethylene glycol as a solvent and vibrate evenly under ultrasonic conditions, then in nitrogen or Under the protection of argon atmosphere, stir and reflux in an oil bath at 180°C for 3 hours, then cool to room temperature, then centrifuge the product, wash, and finally treat it in a hydrogen atmosphere at 200°C for 0.5 hours to obtain a mercapto-anchored platinum / carbon nanotube catalyst .

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Abstract

The invention provides a preparation method of sulfhydryl anchoring platinum and platinum-gold / carbon nano-tube catalyst, belonging to fuel cell technical field. The method comprises following steps: reacting hydroxylation carbon nano-tube successively with reagent containing halogen and hydrosulphide to prepare sulfhydryl carbon nano-tube; reflowing the sulfhydryl carbon nano-tube and platinum salts in polyatomic alcohol, processing in hydrogen atmpsphere to obtain sulfhydryl anchoring platinum / carbon nano-tube catalyst; reflowing the sulfhydryl carbon nano-tube successively with the hydrochloroauric acid and the platinum salts in polyatomic alcohol, processing in hydrogen atmpsphere to obtain sulfhydryl anchoring platinum-gold / carbon nano-tube catalyst. The sulfhydryl anchoring platinum and platinum-gold / carbon nano-tube catalyst prepared by the invention has good stability and catalytic performance, can effectively settle the technical problems that the catalyst surface area is lowered and the activity is declined caused by surface migration and agglomeration growth on carbon carrier of platinum nanometer particles, and can also replace homogeneous commercialized catalyst.

Description

1. Technical field: [0001] The invention belongs to the technical field of fuel cells, in particular to a method for preparing a mercapto-anchored platinum and platinum-gold / carbon nanotube catalyst. 2. Background technology: [0002] As a device that directly converts chemical energy into electrical energy, fuel cells have the advantages of high efficiency, low pollution and even zero emissions, and have attracted great attention from governments and business groups in various countries. Due to the continuous advancement of technology, the trend of industrialization and commercialization is becoming more and more obvious. However, catalysts have become one of the important factors restricting the commercial application of fuel cells, especially low-temperature fuel cells (such as proton exchange membrane fuel cells). Low-temperature fuel cell catalysts are still noble metal catalysts dominated by platinum group metals. Platinum group metals are expensive and resources are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/045H01M4/92
CPCY02E60/50
Inventor 魏子栋季孟波唐容陈四国李莉
Owner CHONGQING UNIV
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