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Preparation method of carbon-loaded platinum-based alloy catalyst

A technology of platinum-based alloys and catalysts, which is applied in the field of preparation of carbon-supported platinum-based alloy catalysts, can solve problems such as unsatisfactory use and inability to form platinum-based alloys, and achieve benefits for industrial production, reduce fluidity, and improve uniformity Effect

Active Publication Date: 2020-09-15
氢电中科(广州)新能源设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the preparation method, platinum-based alloy catalysts cannot form platinum-based alloys with good catalytic activity, which still cannot meet their use in fuel cells.

Method used

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  • Preparation method of carbon-loaded platinum-based alloy catalyst
  • Preparation method of carbon-loaded platinum-based alloy catalyst
  • Preparation method of carbon-loaded platinum-based alloy catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of a carbon-supported platinum-nickel alloy catalyst is carried out in sequence according to the following steps:

[0024] (1) In the aqueous solution containing 200 mg of potassium chloroplatinate and 22 mg of nickel chloride, add 268 mg of activated carbon to obtain a mixed slurry;

[0025] (II) Place the mixed slurry prepared in step I in an ice bath, and cool the mixed slurry to 0°C under stirring;

[0026] (Ⅲ) Quickly adjust the pH value of the cooled mixed slurry in the second step to 12~14 with a strong alkali solution of sodium hydroxide within 2 minutes;

[0027] (IV) Quickly freeze the mixed slurry after adjusting the pH value in step III with liquid nitrogen within 1 minute, and then freeze-dry in liquid nitrogen to obtain the precursor of platinum-nickel alloy;

[0028] (Ⅴ) Put the freeze-dried platinum-nickel alloy precursor prepared in Section IV in a mixed reducing atmosphere with a volume ratio of hydrogen and nitrogen of 5:95, heat...

Embodiment 2

[0036] A preparation method of a carbon-supported platinum-cobalt alloy catalyst is carried out in sequence according to the following steps:

[0037] (I) Add 375 mg of carbon fiber to an aqueous solution containing 300 mg of sodium chloroplatinite and 90 mg of cobalt acetate to obtain a mixed slurry;

[0038] (II) Place the mixed slurry prepared in step I in an ice bath, and cool the mixed slurry to -2°C under stirring;

[0039] (Ⅲ) Quickly adjust the pH value of the cooled mixed slurry in the second step to 12~14 with potassium hydroxide strong alkali solution within 3 minutes;

[0040] (IV) The mixed slurry after adjusting the pH value in step III is quickly frozen with liquid nitrogen within 30 seconds, and then freeze-dried in liquid nitrogen to obtain the precursor of platinum-cobalt alloy;

[0041] (Ⅴ) Put the freeze-dried platinum-cobalt alloy precursor prepared in IV in a mixed reducing atmosphere with a volume ratio of hydrogen and nitrogen of 5:95, heat treatment a...

Embodiment 3

[0044] A preparation method of a carbon-supported platinum-copper alloy catalyst is carried out in sequence according to the following steps:

[0045] (I) Add 240 mg of graphene to the aqueous solution containing 400 mg of chloroplatinic acid and 100 mg of copper sulfate to obtain a mixed slurry;

[0046] (II) Place the mixed slurry prepared in step I in an ice bath, and cool the mixed slurry to 1 °C under stirring conditions;

[0047] (Ⅲ) Quickly adjust the pH value of the cooled mixed slurry in the second step to 12~14 with a strong alkali solution of sodium hydroxide within 5 minutes;

[0048] (IV) The mixed slurry after adjusting the pH value in step III was quickly frozen with liquid nitrogen within 2 minutes, and then freeze-dried in liquid nitrogen to obtain the precursor of platinum-copper alloy;

[0049] (Ⅴ) The freeze-dried platinum-copper alloy precursor prepared in step IV is subjected to a heat preservation heat treatment at a rate of 10°C / min to 700°C for 8 hours ...

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Abstract

The invention provides a preparation method of a carbon-loaded platinum-based alloy catalyst, which comprises the following steps: adding a carbon carrier into an aqueous solution of a platinum-containing precursor compound and a transition metal-containing precursor compound; and adjusting the pH value in an ice bath, quickly freezing and drying, carrying out heat treatment in a reducing atmosphere, and carrying out after-treatment. The prepared catalyst is good in alloy state, the catalytic activity exceeds that of common platinum-carbon catalysis by three times or above, no surfactant is used in the preparation method, use of chemical reagents is reduced, and industrial production is better facilitated.

Description

technical field [0001] The invention relates to a preparation method of a noble metal catalyst, in particular to a preparation method of a carbon-supported platinum-based alloy catalyst. Background technique [0002] At present, the core material in fuel cells—catalysts are still commonly used as carbon-supported noble metal platinum catalysts. With the demonstration and application of hydrogen fuel cells, especially in the field of transportation, the demand for fuel cells is increasing. , the consumption of the precious metal platinum increases, so reducing the amount of platinum is always the direction of technology under the condition that the performance is not reduced or even the performance needs to be improved. Platinum-based alloys formed by carbon-supported noble metal platinum and other non-noble metals are widely used in the current alternatives, and their preparation methods also use liquid phase reduction methods. For example, Chinese patent application 1026106...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/00H01M4/92
CPCB01J23/892B01J23/8926B01J23/8913B01J37/00H01M4/921H01M4/926B01J35/33Y02E60/50
Inventor 曾建皇杨丽君肖卓杰
Owner 氢电中科(广州)新能源设备有限公司
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