Co-N-C/SiO2 composite nanometer catalyst, preparation method thereof and application

A nano-catalyst and catalyst technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, amino compound preparation, etc., can solve the problem of difficult precise control of the size of metal nanoparticles, poor coupling reaction selectivity and catalytic activity, low catalytic activity, etc. problems, to achieve optimal catalytic activity and stability, improve dispersion, and high catalytic activity

Active Publication Date: 2017-10-17
SUZHOU UNIV
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  • Application Information

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Problems solved by technology

However, these methods all have the following disadvantages: first, due to the influence of the surface properties of the carrier and the reduction conditions, the size of metal nanoparticles is usually difficult to control precisely; second, in porous materials, while obtaining stable metal nanoparticles Maintaining its accessibility and mass transfer capability is a challen

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  • Co-N-C/SiO2 composite nanometer catalyst, preparation method thereof and application
  • Co-N-C/SiO2 composite nanometer catalyst, preparation method thereof and application
  • Co-N-C/SiO2 composite nanometer catalyst, preparation method thereof and application

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preparation example Construction

[0037] The invention provides a Co-N-C / SiO 2 The preparation method of composite nano-catalyst comprises:

[0038] Mix the cobalt metal precursor salt, nitrogen-containing organic carbon source and mesoporous silica, and then roast to obtain Co-N-C / SiO 2 Composite nanocatalysts.

[0039] The preparation method disclosed in the present invention can prepare Co-N-C / SiO in one step without using any solvent 2 Composite nano-catalyst, simple and easy to operate.

[0040]The cobalt metal precursor salt is preferably cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O), cobalt sulfate heptahydrate (CoSO 4 ·7H 2 O), cobalt chloride hexahydrate (CoCl 2 ·6H 2 O), one or more of cobalt acetate and cobalt acetoacetate. The nitrogen-containing organic carbon source is preferably one or more of amino acids, dopamine and melamine; more preferably histidine (His), arginine (Arg) and glutamic acid (Glu), dopamine and melamine one or more of. If a nitrogen-free organic carbon source is...

Embodiment 1

[0061] Will (Co(NO 3 ) 2 ·6H 2 O, His, and SBA-15 were ground and mixed at a mass ratio of 0.4:0.2:1.0, placed in a tube furnace, heated to 700°C at a heating rate of 5°C / min under a nitrogen atmosphere, and then, at this temperature After 3 hours of lower calcination, it was naturally cooled to room temperature to obtain sample 1.

Embodiment 2

[0063] Will (Co(NO 3 ) 2 ·6H 2 O, His, and SBA-15 were ground and mixed according to the mass ratio of 0.4:0.4:1.0, placed in a tube furnace, heated to 700°C at a heating rate of 5°C / min under a nitrogen atmosphere, and then, at this temperature After 3 hours of lower calcination, it was naturally cooled to room temperature to obtain sample 2.

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Abstract

The invention provides a preparation method of a Co-N-C/SiO2 composite nanometer catalyst. The method comprises the following steps: uniformly mixing and sintering cobalt metal precursor salt, a nitrogen-containing organic carbon source and mesoporous silica, so as to obtain the Co-N-C/SiO2 composite nanometer catalyst. In the catalyst, ultra small cobalt metal nanometer particles can be properly stabilized in a carbon layer, proper pore structures and pore diameters can further effectively promote the diffusion and the separation of reaction matrixes and products, and the catalyst has good dispersibility in an aqueous system and further is easy to recycle. The preparation method does not need any solvents, can obtain the composite nanometer catalyst by one step, and is easy and practical. The composite nanometer catalyst prepared through the method does not need any complex pretreatments, can be applied to hydrogen production-hydrogen addition coupling reaction, and shows excellent catalytic activity and stability for preparing phenylamine and derivatives thereof though nitrobenzene compounds.

Description

technical field [0001] The invention relates to the technical field of porous composite catalytic materials loaded with non-noble metals, in particular to a Co-N-C / SiO 2 Composite nanocatalyst, its preparation method and application. Background technique [0002] Metal nanoparticles have shown irreplaceable catalytic effects in the chemical industry, and thus have received extensive attention. How to improve the utilization efficiency, catalytic activity and stability of metal catalysts has become one of the core goals of current research. At present, it is mainly realized through the following three ways. The first approach: preparing ultra-small nanoparticles, increasing their specific surface area, and enriching surface defects (active sites), thereby providing higher catalytic active sites. The second approach is to synthesize supported catalysts and introduce porous supports with special surface properties, which can not only disperse metal nanoparticles to prevent t...

Claims

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Application Information

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IPC IPC(8): B01J29/03C07C209/36C07C211/46
CPCB01J29/0333B01J35/0033B01J2229/18C07C209/325C07C211/46
Inventor 吴张雄张主军吴铎陈晓东
Owner SUZHOU UNIV
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