Metal-free nitrogen-doped functionalized mesoporous carbon catalyst and preparation method and applications thereof

A carbon catalyst, nitrogen doping technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of low catalytic activity, improve catalytic activity, improve stability, and reduce dependence. Effect

Inactive Publication Date: 2014-02-12
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low catalytic activity, carbon materials obtained by the template method are mostly used as supports for other noble metal or non-noble metal catalysts [Chem.Mater.17, 3960(2005)]
In addition, the study of mesoporous carbon materials synthesized by the template method to improve their catalytic activity by heteroatom doping, so that they can be independently used as catalysts has not been reported.

Method used

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  • Metal-free nitrogen-doped functionalized mesoporous carbon catalyst and preparation method and applications thereof
  • Metal-free nitrogen-doped functionalized mesoporous carbon catalyst and preparation method and applications thereof
  • Metal-free nitrogen-doped functionalized mesoporous carbon catalyst and preparation method and applications thereof

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Effect test

Embodiment 1

[0038] A metal-free nitrogen-doped functionalized mesoporous carbon catalyst, the precursor of which comprises 46% of the silica with a template diameter of 35nm, and 20% of the nitrogen-containing compound PEI (polyethyleneimine, Sigmaaldrich, 408700-250ML, Mw: 2000) and the transition metal salt heptahydrate ferrous sulfate heptahydrate with a mass content of 34%, the above-mentioned mass content is based on the total mass of the precursor.

[0039] The preparation method of the above-mentioned metal-free nitrogen-doped functionalized mesoporous carbon catalyst is as follows: polyethyleneimine and silicon dioxide are formulated into 50% PEI aqueous solution and 20% SiO 2 Aqueous solution, weigh 0.7448g FeSO 4 ·7H 2 O and 0.9g of 50% PEI aqueous solution, and combine it with 5g of 20% SiO 2 The aqueous solution was mixed uniformly under the condition of stirring, dried in an oven at 85° C. overnight after ultrasonication for 8 hours, and ground into powder to obtain a catal...

Embodiment 2

[0041] A metal-free nitrogen-doped functionalized mesoporous carbon catalyst, the precursor of which comprises 40% template agent with a diameter of 35nm silicon dioxide, 18% nitrogen-containing compound PEI (polyethyleneimine, Sigmaaldrich, 408700-250ML, Mw: 2000) and a transition metal salt iron sulfate with a mass content of 42%, the above mass content is based on the total mass of the precursor.

[0042] The preparation method of the above-mentioned metal-free nitrogen-doped functionalized mesoporous carbon catalyst is as follows: polyethyleneimine and silicon dioxide are formulated into 50% PEI aqueous solution and 20% SiO 2 Aqueous solution, weigh 1.071gFe 2 (SO 4 ) 3 and 0.9g of 50% PEI aqueous solution, and combine it with 5g of 20% SiO 2 The aqueous solution was mixed uniformly under the condition of stirring, dried in an oven at 85° C. overnight after ultrasonication for 8 hours, and ground into powder to obtain a catalyst precursor. Put the above precursor in th...

Embodiment 3

[0044] A kind of metal-doped nitrogen functionalized mesoporous carbon catalyst, its precursor includes the silicon dioxide that the template agent diameter of 45% is 35nm by mass content, the nitrogen-containing compound PEI (polyethyleneimine, Sigmaaldrich) that mass content is 20 , 408700-250ML, Mw: 2000) and transition metal salt cobalt sulfate with a mass content of 35%, the above mass content is based on the total mass of the precursor.

[0045] The preparation method of the above-mentioned metal-free nitrogen-doped functionalized mesoporous carbon catalyst is as follows: polyethyleneimine and silicon dioxide are formulated into 50% PEI aqueous solution and 20% SiO 2 Aqueous solution, weigh 0.7526gCoSO 4 and 0.9g of 50% PEI aqueous solution, and combine it with 5g of 20% SiO 2 The aqueous solution was mixed uniformly under the condition of stirring, dried in an oven at 85° C. overnight after ultrasonication for 8 hours, and ground into powder to obtain a catalyst precur...

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Abstract

The invention relates to a metal-free nitrogen-doped functionalized mesoporous carbon catalyst and preparation method and applications thereof. A precursor of the metal-free nitrogen-doped functionalized mesoporous carbon catalyst comprises the following components in percentage by mass: 20-85% of template agent, 10-75% of nitrogen compound, and 5-50% of transition metal salt. The nitrogen compound is carbonized at high temperature under the existence condition of transition metal, to form a high-nitrogen-content pyridine and graphite nitrogen (Nx-C) composite structure, and the catalytic activity of oxygen can be remarkably enhanced; the transition metal in the nitrogen-doped mesoporous carbon catalyst can be removed through acid pickling, so that the inactivation (corrosion) of the catalyst containing the transition metal under the conditions of strong acid and strong alkali can be avoided, the characteristics of being high in stability, not easy to poison and the like can be achieved, and the metal-free nitrogen-doped functionalized mesoporous carbon catalyst has excellent application prospects in the fields of treating waste water of fuel batteries, metal-air batteries, supercapacitors, energy-storage batteries, microbial fuel cells, and the like.

Description

technical field [0001] The invention belongs to the field of carbon catalysts and their preparation and application, in particular to a metal-free nitrogen-doped functionalized mesoporous carbon catalyst and its preparation method and application. Background technique [0002] In the context of the reduction of global oil and coal reserves and the increasingly serious environmental pollution, fuel cells have become the most promising new generation of power sources due to their advantages of high efficiency and environmental protection. The reason currently restricting the large-scale application of fuel cells mainly comes from the high cost of noble metal oxygen cathode catalysts mainly composed of platinum group metals. [0003] In recent decades, researchers have devoted themselves to the study of non-precious metal catalysts in order to fundamentally solve the impact of catalyst cost on the commercialization of fuel cells. Nitrogen-doped carbon materials with transition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24H01M4/90H01M4/88
CPCY02E60/50
Inventor 乔锦丽石晶晶徐攀卿欣周学俊
Owner DONGHUA UNIV
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