A kind of preparation method of double-layer hollow nitrogen-doped carbon ball-coated copper nano-catalyst

Abstract

The invention relates to the preparation field of copper-based catalysts and particularly relates to a preparation method for preparing a double-layer hollow nitrogen-doped carbon sphere-coated copper nano-catalyst. The method comprises the following steps of (1) coating a layer of phenolic resin on the surface of each SiO2 microsphere; (2) subjecting a product obtained in the step (1) to excessive dipping treatment with melamine and a copper salt solution; (3) re-coating the SiO2 microsphere on the surface of a product obtained in the step (2), and coating another layer of phenolic resin on the outermost layer of the SiO2 microsphere; (4) subjecting a product obtained in the step (3) to high-temperature carbonization treatment to carbonize the two layers of phenolic resin; conducting the washing treatment by adopting HF; removing the SiO2 microsphere; subjecting an obtained product to activating treatment in the hydrogen atmosphere and finally obtaining a catalyst. The catalytic activity of the catalyst is high up to 1670 mg / g*h. Compared with a carbon-coated copper catalyst simple in structure, the catalytic activity and the stability are effectively improved. Meanwhile, after reaction, active components are not easily agglomerated. Therefore, the method is an advanced method for preparing a nitrogen-doped hollow carbon ball-coated nano-copper catalyst.

Description

technical field [0001] The invention relates to the field of preparation of copper-based catalysts, in particular to a preparation method of a double-layer hollow nitrogen-doped carbon sphere-coated copper nano-catalyst, which can be used to catalyze the oxidative carbonylation of methanol to prepare dimethyl carbonate. Background technique [0002] In recent years, confinement effects at the nanoscale have been successfully applied to catalytic science. Carbon materials have stable chemical properties, low mass density, and excellent electrical conductivity, and are often widely used in the field of catalysis. At present, based on the confinement effect, carbon materials such as carbon nanotubes, graphene, and hollow carbon spheres are often designed as catalyst supports. [0003] Copper-based catalysts catalyze the oxidative carbonylation of methanol to dimethyl carbonate (DMC), which has been widely used because of its low production cost, low corrosion to equipment, hig...

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Problems solved by technology

[0004] Aiming at the problem that the active components in DMC prepared by oxidative carbonylation of methanol are easy to agglomerate, the preparation of nitrogen-doped carbon spheres with double-layer structure is a new method to solve this problem, and it is still under research

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