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Amorphous porous silicon dioxide coated Pt/C catalyst and preparation method thereof

A porous silica and amorphous technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problem of poor activity and stability of Pt/C catalyst question

Active Publication Date: 2020-10-20
GEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome above-mentioned technical deficiency, propose a kind of Pt / C catalyst coated with amorphous porous silica and preparation method thereof, solve the relatively poor activity and stability of existing Pt / C catalyst in the prior art technical problem

Method used

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  • Amorphous porous silicon dioxide coated Pt/C catalyst and preparation method thereof
  • Amorphous porous silicon dioxide coated Pt/C catalyst and preparation method thereof
  • Amorphous porous silicon dioxide coated Pt/C catalyst and preparation method thereof

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preparation example Construction

[0018] see figure 1 , the first aspect of the present invention provides a method for preparing a Pt / C catalyst coated with amorphous porous silica, comprising the following steps: preparing platinum nanoparticles S1; preparing modified platinum nanoparticles S2; preparing amorphous porous Silica-coated Pt / C catalyst S3. Each step is described in detail below.

[0019] The steps for preparing platinum nanoparticles S1 are as follows: adjust the pH of the platinum-containing solution to 10-12, add a reducing agent, heat to 80-100°C, stir and reflux for 2-4 hours, centrifuge and wash to obtain platinum nanoparticles. In this embodiment, the platinum-containing solution is an ethylene glycol solution of 0.005-0.05 mol / L chloroplatinic acid, the reducing agent is 1-5 mol / L sodium borohydride solution, and the platinum-containing solution is chloroplatinic acid and boron in the reducing agent The molar ratio of sodium hydride is (0.01-0.03):1. In this process, the solvent used f...

Embodiment 1

[0024] Adjust the pH of the platinum-containing solution prepared by 1.06g of chloroplatinic acid hexahydrate and 200mL of ethylene glycol to 11 with sodium hydroxide solution, keep stirring, and add 80ml of NaBH with a molar concentration of 1.5mol / L 4 The solution was heated to 90° C., stirred and refluxed for 3 h, centrifuged and washed with a mixed solution of ethanol and water at a volume ratio of 1:1 to obtain platinum nanoparticles.

[0025] Disperse the above-mentioned platinum nanoparticles in 100ml of deionized water, then add 0.4g of polyvinylpyrrolidone, stir for 20h, then add a mixed solution of 0.4g of cetyltrimethylammonium bromide and 200mL of isopropanol, and continue stirring for 1h. Centrifuge to obtain modified platinum nanoparticles.

[0026]Add the above-mentioned modified platinum nanoparticles into 300ml of carbon black dispersion with a mass concentration of 2g / L, stir at room temperature for 12h, adjust the pH to 10 with sodium hydroxide solution, and...

Embodiment 2

[0029] Adjust the pH of the platinum-containing solution prepared by 0.53g of chloroplatinic acid hexahydrate and 200mL of ethylene glycol to 11 with sodium hydroxide solution, keep stirring, and add 60ml of NaBH with a molar concentration of 1mol / L 4 The solution was heated to 90° C., stirred and refluxed for 3 h, centrifuged and washed with a mixed solution of ethanol and water at a volume ratio of 1:1 to obtain platinum nanoparticles.

[0030] Disperse the above platinum nanoparticles in 20ml of deionized water, then add 0.04g of polyvinylpyrrolidone, stir for 18h, then add a mixed solution of 0.04g of cetyltrimethylammonium bromide and 50mL of isopropanol, and continue stirring for 1.5h , centrifuged to obtain modified platinum nanoparticles.

[0031] Add the above-mentioned modified platinum nanoparticles to 400ml of carbon black dispersion with a mass concentration of 2g / L, stir at room temperature for 12h, adjust the pH to 10 with sodium hydroxide solution, and add 0.5m...

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Abstract

The invention discloses an amorphous porous silicon dioxide coated Pt / C catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing platinum nanoparticles; preparing modified platinum nanoparticles; and preparing the amorphous porous silicon dioxide coated Pt / C catalyst. According to the preparation method disclosed by the invention, the surfaces of the uniformly-loaded Pt particles are coated with the amorphous porous silicon dioxide nano-layers, so that on one hand, the platinum nano-particles can be protected and are prevented from being agglomerated in a reaction process, and the stability of the catalyst is favorably improved. On the other hand, due to the existence of a porous structure in the silicon dioxide nano layer, the process of diffusing reaction gas to the surface of Pt is not influenced, and the conductivity of the carbon carrier is not influenced, so that the catalyst has relatively high catalytic activity. The method provided by the invention does not destroy the structure of the carbon carrier, and has no influence on the reaction activity and conductivity of the carbon carrier.

Description

technical field [0001] The invention relates to the technical field of hydrogen fuel cell catalysts, in particular to an amorphous porous silica-coated Pt / C catalyst and a preparation method thereof. Background technique [0002] Hydrogen fuel cell is a power generation device that directly converts the chemical energy of hydrogen and oxygen into electrical energy. It is not only completely pollution-free, but also avoids the time-consuming problem of traditional battery charging. It is currently the most promising new energy method and has great potential. application prospects. [0003] Pt / C catalyst is the key material for the preparation of hydrogen fuel cells. In the Pt / C catalyst, Pt is mainly dispersed on the carbon support in the form of 2-3nm particles, and its loading capacity is as high as 20-60%, which makes Pt easy to agglomerate and deactivate in the catalytic reaction. At present, the carbon support is generally treated with a strong oxidizing acid to enhanc...

Claims

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Application Information

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IPC IPC(8): H01M4/92H01M4/86B01J23/42B01J35/10B82Y30/00B82Y40/00
CPCH01M4/926H01M4/8663B01J23/42B82Y30/00B82Y40/00B01J35/394B01J35/33B01J35/60Y02E60/50
Inventor 许开华华文超张坤李琴香魏琼肖力易庆平苏陶贵
Owner GEM CO LTD
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