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A kind of non-precious metal catalyst and preparation method thereof

A non-precious metal, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of poor tolerance and long-term operation stability, low catalytic activity and stability, and preparation conditions. Harsh and other problems, to achieve the effects of good CH3OH tolerance, low price, and simple preparation method

Inactive Publication Date: 2020-06-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, the preparation of carbon-based non-precious metal catalysts has mainly focused on the template method, high-temperature calcination method, chemical vapor deposition method, hydrothermal synthesis method and other methods with complex operations and harsh preparation conditions.
[0003] In summary, the disadvantages of using noble metal catalysts in power devices are limited resources, high prices, CH 3 OH / CO tolerance and long-term operation stability are poor; while the expected non-precious metal catalysts are rich in resources and low in price, but their catalytic activity and stability are far lower than those of noble metal catalysts

Method used

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  • A kind of non-precious metal catalyst and preparation method thereof
  • A kind of non-precious metal catalyst and preparation method thereof
  • A kind of non-precious metal catalyst and preparation method thereof

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preparation example Construction

[0031] The preparation method of the non-noble metal catalyst provided by the present invention comprises the following steps:

[0032] (1) The metal compound and the organic molecular linking agent are dissolved in the solvent respectively at a molar ratio of 1: (3 to 4), and the obtained two solutions are uniformly mixed; the mixed solution is left to stand, so that the metal ion and Organic molecules undergo a chelation reaction to generate a precipitate; the precipitate is treated by centrifugation or suction filtration to obtain an intermediate product; and the intermediate product is dried to obtain a precursor;

[0033] (2) The precursor is placed under an inert atmosphere, and the temperature is raised to 600-1000° C. at a rate of 5-10° C. / min, and a pyrolytic carbonization treatment is performed at this temperature to obtain a non-precious metal catalyst.

Embodiment 1

[0036] A non-noble metal-doped porous carbon-nitrogen material catalyst, the preparation method of which is as follows:

[0037] (1) After dissolving the metal compound (cobalt nitrate) and the organic molecule linking agent (dimethylimidazole) in a molar ratio of 1:4 in anhydrous methanol, the two solutions obtained by dissolving are mixed and stirred evenly, Stand still at room temperature for 24h, make the metal ion in the metal compound and the organic molecule in the organic molecule linking agent carry out chelation reaction, generate precipitate; The precipitate is carried out centrifugation or suction filtration process, the solid (intermediate product) that obtains is in 80 Dry at ℃ to obtain a purple powdery precursor;

[0038] (2) Put the obtained purple powdery precursor in an inert atmosphere (N 2 ), at a rate of 5°C / min, the temperature is raised to 600-900°C, and the pyrolytic carbonization treatment is carried out at this temperature for 2-10 hours; a non-prec...

Embodiment 2

[0052] A non-noble metal-doped porous carbon-nitrogen material catalyst, the preparation method of which is as follows:

[0053] (1) Put the metal compound (the mixture of cobalt nitrate and copper nitrate, the molar ratio is 1 to 9:1) and the organic molecular linking agent (dimethylimidazole) in the molar ratio of 1:4, in anhydrous methanol After dissolving respectively in the solution, mix and stir the two solutions obtained by dissolving evenly, and let stand at room temperature for 12 hours, so that the metal ions and organic molecules undergo a sufficient chelation reaction to form a precipitate; the precipitate is subjected to centrifugation or suction filtration, The obtained solid was dried at 80°C to obtain a purple powdery precursor;

[0054] (2) Put the obtained purple powdery precursor in an inert atmosphere (N 2 ), at a heating rate of 10°C / min, the temperature is raised to 600-900°C, and the pyrolytic carbonization treatment is carried out at this temperature f...

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Abstract

The invention discloses a non-noble metal catalyst and a preparation method thereof. The preparation method comprises the steps as follows: (1) a metal compound and an organic molecule linking agent are dissolved respectively in proportion, two solutions obtained after dissolution are uniformly mixed, and thus, metal ions and organic molecules are subjected to a chelation reaction to produce precipitates; the precipitates are subjected to centrifugal or suction filtration treatment, an intermediate product is obtained and dried, and a precursor is obtained; (2) the precursor is subjected to pyrolysis carbonization treatment in an inert atmosphere, and the non-noble metal catalyst is obtained. The prepared non-noble metal catalyst takes an organic metal framework structure as a core, has multi-walled carbon nanotubes on the surface and has the larger specific surface area; the non-noble metal catalyst has good oxygen reduction catalytic performance, oxygen evolution catalytic performance, stability and CH3OH tolerance and can maintain long-term and stable catalytic activity when applied to fuel cells.

Description

technical field [0001] The invention belongs to the technical field of power device catalysts, and more specifically relates to a non-noble metal catalyst and a preparation method thereof. Background technique [0002] Proton exchange membrane fuel cells, methanol fuel cells, electrolyzed water devices and integrated renewable fuel cells are power generation devices that directly convert chemical energy in fuels into electrical energy through electrochemical reactions without combustion, and are green energy sources; Compared with rechargeable batteries, some storage batteries have the characteristics of high energy, high power, no pollution, high efficiency and miniaturization, and their future popularity and market prospects are widely expected. However, the above-mentioned catalysts for fuel cell electrodes, especially cathode oxygen reduction catalysts, such as platinum-based catalysts, have become one of the main bottlenecks that hinder their commercialization due to fa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10B01J21/18
CPCB01J21/185B01J27/24B01J35/006B01J35/10B01J35/1023
Inventor 唐浩林吴佳宾曾燕王锐魏希蔡世昌
Owner WUHAN UNIV OF TECH
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