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Nanocomposite catalysts with high metal loading and dispersion and their preparation and application

A nanocomposite and catalyst technology, applied in nanotechnology for materials and surface science, organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, etc., can solve the problem of metal utilization efficiency reduction, mass transfer Problems such as deterioration of properties, to achieve the effect of high utilization, narrow size distribution, and uniform distribution of alloy composition

Active Publication Date: 2020-10-09
无锡盛鑫氢能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, when metal nanoparticles enter the micropores of the support, the metal utilization efficiency decreases due to poor mass transfer properties.

Method used

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  • Nanocomposite catalysts with high metal loading and dispersion and their preparation and application
  • Nanocomposite catalysts with high metal loading and dispersion and their preparation and application
  • Nanocomposite catalysts with high metal loading and dispersion and their preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1, Synthesis and performance of a nanocomposite catalyst (Pt content: 63wt%) composed of organic amine salt modified carbon support and Pt metal nanoclusters

[0058] 1) Add 1g H 2 PtCl 6 ·6H 2 O was dissolved in 50 mL of ethylene glycol, and the resulting solution was mixed with 50 mL of NaOH in ethylene glycol (0.26 mol / L). at N 2 The mixture was stirred under atmosphere and heated to 160 °C by microwave for 5 min, under N 2 Cool to room temperature under the atmosphere to prepare a Pt metal nanocluster colloidal solution with a Pt concentration of 3.7 g / L;

[0059] 2) Dissolve 0.2764 g of trimethylhexadecyl ammonium bromide (CTAB) in 20 mL of chloroform. Add 18.5 mg of carbon powder (EC-600JD) to the above mixture and ultrasonically treat it for 5 minutes. The solid in the mixture is separated by centrifugation (4000rpm, 5min) and washed with chloroform. The solid obtained by centrifugation is redispersed in 20mL chloroform;

[0060] 3) 20 mL of the Pt...

Embodiment 2

[0075] Example 2, Synthesis and performance of nanocomposite catalyst (Pt content: 73wt%) composed of organic amine salt modified carbon support and Pt metal nanoclusters

[0076] 1) prepare the Pt metal nanocluster colloidal solution of 3.7g / L by the method for embodiment 1;

[0077] 2) Add 0.6911g of trimethylhexadecylammonium bromide (CTAB) into 50mL of chloroform, and sonicate the resulting mixture for 5 minutes; add 18.5mg of carbon powder (EC-600JD) to the above mixture and sonicate for 1.5 hours , add 50mL of the Pt metal nanocluster colloidal solution prepared in the first step, and stir the resulting mixture in a water bath (12000rpm, 2 hours); filter and separate the solid in the mixture, wash the solid with hot water (80-100°C) and remove it Drying in a vacuum drying oven at 60° C., the nanocomposite catalyst C composed of the organic amine salt modified carbon support and Pt metal nanoclusters is obtained.

[0078] The ICP-AES test shows that the mass percentage o...

Embodiment 3

[0079] Example 3, Synthesis and performance of nanocomposite catalyst (Pt content: 65wt%) composed of organic amine salt modified carbon support and Pt metal nanoclusters

[0080] Tetradecyltrimethylammonium bromide was used instead of trimethylhexadecylammonium bromide in Example 2, and synthesized according to the method described in Example 2 to obtain the nanocomposite catalyst.

[0081] ICP-AES test shows that the mass percentage of Pt metal nanoclusters in the prepared nanocomposite catalyst is 65wt%. Electrochemical catalytic experiments showed that the nanocomposite catalyst had an activity of 345A / g catalyst (0.85V vs RHE) for the oxygen reduction reaction in oxygen-saturated perchloric acid solution (0.1M) ( Figure 15 ). TEM image ( Figure 16 ) shows that the number-average particle size of metal nanoclusters in the nanocomposite catalyst is 1.8nm.

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Abstract

The invention discloses a nanocomposite catalyst with high metal loading and dispersion, a preparation method of the nanocomposite catalyst and its application in catalytic fuel cells and other aspects. The catalyst is basically composed of a carbon carrier modified with an organic amine salt and a metal or alloy nanocluster. The number average particle size of the metal or alloy nanocluster is 1.5 to 3.3 nanometers. The mass percentage of metal in the catalyst is 45% to 86%, and the mass percentage of nitrogen is 0.1% to 2%. The catalyst of the present invention has high metal loading, small metal or alloy nanocluster size, high dispersion, narrow particle size distribution, and uniform alloy composition distribution, which solves the problems existing in this field in the past and has good catalytic performance for fuel cell reactions. .

Description

technical field [0001] The invention relates to a nanocomposite catalyst, in particular to a nanocomposite catalyst with high metal loading, small particle size of metal or its alloy nanoclusters, and narrow particle size distribution, as well as its preparation method and its application in the fields of catalytic fuel cell reaction and the like application. Background technique [0002] Multiphase metal catalysts with high metal loading, small size of metal and alloy nanoclusters, and narrow particle size distribution have important application value in fuel cells, lithium-oxygen batteries, satellite attitude control engines, etc. In addition, the development of such catalysts also has positive significance in reducing the volume and energy consumption of catalytic reaction devices. [0003] A fuel cell is a device that converts the chemical energy of fuel into electrical energy. The cathode catalytic electrode and the anode catalytic electrode are the main functional com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28B01J35/02H01M4/92B01J35/00
CPCH01M4/8647H01M4/926B82Y30/00B82Y40/00B01J31/28B01J35/393B01J35/00B01J35/30B01J35/33Y02E60/50
Inventor 王远郭萌刘岩
Owner 无锡盛鑫氢能科技有限公司
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