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Oxygen reduction catalyst as well as preparation method and application thereof

A catalyst and thermal cracking technology, which is applied in the field of oxygen reduction catalyst and its preparation, can solve the problems of high price of oxygen reduction catalyst and waste tire pollution, and achieve excellent catalytic performance, easy operation and good catalytic performance

Inactive Publication Date: 2020-03-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Based on the technical problems existing in the background technology, the present invention proposes an oxygen reduction catalyst and its preparation method and application. The present invention aims at the development limitation of proton exchange membrane fuel cells, the high price of oxygen reduction catalyst, and the pollution problems of waste tires, and provides An oxygen reduction catalyst with excellent catalytic performance and high stability using waste tire pyrolysis carbon black as raw material

Method used

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  • Oxygen reduction catalyst as well as preparation method and application thereof
  • Oxygen reduction catalyst as well as preparation method and application thereof
  • Oxygen reduction catalyst as well as preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0027] A preparation method of an oxygen reduction catalyst, comprising the steps of:

[0028] Take waste tire pyrolysis carbon black, and carry out thermal cracking at 700°C for 2 hours in an ammonia atmosphere;

[0029] Cool the waste tire pyrolysis carbon black after primary pyrolysis to room temperature, then place it in 0.3 mol / L sulfuric acid aqueous solution, stir at 100°C for 8 hours, filter, wash the filter cake with water and ethanol in sequence until the pH of the washing liquid is Neutral, then bake at 100°C for 24 hours;

[0030] Then, in a mixed gas atmosphere of nitrogen and ammonia, carry out secondary thermal cracking at 1100° C. for 0.5 h, and cool to room temperature to obtain an oxygen reduction catalyst, wherein the volume fraction of nitrogen in the mixed gas is 20%, and N 2 -20 means.

Embodiment 2

[0032] A preparation method of an oxygen reduction catalyst, comprising the steps of:

[0033] Take waste tire pyrolysis carbon black, and carry out thermal cracking at 1000°C for 20 minutes in an ammonia atmosphere;

[0034] Cool the waste tire pyrolysis carbon black after primary pyrolysis to room temperature, then place it in a 1mol / L sulfuric acid aqueous solution, stir at 80°C for 24 hours, filter, wash the filter cake with water and ethanol in sequence, until the pH of the washing solution is neutral properties, and then baked at 60°C for 36h;

[0035] Then, in a mixed gas atmosphere of nitrogen and ammonia, carry out secondary thermal cracking at 850° C. for 2 h, cool to room temperature to obtain an oxygen reduction catalyst, wherein the volume fraction of nitrogen in the mixed gas is 40%, and use N 2 -40 means.

Embodiment 3

[0037] A preparation method of an oxygen reduction catalyst, comprising the steps of:

[0038] Take waste tire pyrolysis carbon black, and carry out thermal cracking at 950°C for 1 hour in an ammonia atmosphere;

[0039] Cool the waste tire pyrolysis carbon black after primary thermal cracking to room temperature, then place it in a 0.5 mol / L sulfuric acid aqueous solution, stir at 100°C for 8 hours, remove unstable impurities, filter, and wash with water and ethanol successively Filter cake, until the pH of the washing solution is 7, then bake at 100°C for 24 hours;

[0040] Then, in a mixed gas atmosphere of nitrogen and ammonia, carry out secondary thermal cracking at 900° C. for 2 h, cool to room temperature to obtain an oxygen reduction catalyst, wherein the volume fraction of nitrogen in the mixed gas is 20%, and use N 2 -20 means.

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Abstract

The invention discloses a preparation method of an oxygen reduction catalyst, which comprises the following steps: taking waste tire pyrolysis carbon black, carrying out primary thermal cracking, washing, and carrying out secondary thermal cracking to obtain the oxygen reduction catalyst. The invention also discloses an oxygen reduction catalyst which is prepared according to the preparation method of the oxygen reduction catalyst. The invention also discloses an application of the oxygen reduction catalyst in a proton exchange membrane fuel cell. Aiming at the problems of development limitation of proton exchange membrane fuel cells, overhigh price of oxygen reduction catalysts and pollution of waste tires, the invention provides an oxygen reduction catalyst which takes waste tire pyrolytic carbon black as a raw material and is excellent in catalytic performance and high in stability.

Description

technical field [0001] The invention relates to the technical field of proton exchange membrane fuel cells, in particular to an oxygen reduction catalyst and its preparation method and application. Background technique [0002] With the development of society in recent years, the energy crisis has become a major problem that the whole world faces and urgently needs to be solved. Fuel cells are considered to be a new type of clean energy that can best replace traditional fossil fuels. They have the advantages of high efficiency (45-60%), no pollution, strong feasibility, and flexible installation locations. Fuel cells can be divided into the following categories according to the difference of electrolytes used: phosphoric acid fuel cells, alkaline fuel cells, solid oxide fuel cells, direct methanol fuel cells, and proton exchange membrane fuel cells. [0003] Compared with other fuel cells, the proton exchange membrane fuel cell (PEMFC) is a kind of perfluorosulfonic acid re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/96H01M8/1011
CPCH01M4/96H01M8/1011Y02E60/50
Inventor 杨玲玲
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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