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

Abstract

The invention relates to the field of preparation of copper-based catalysts, specifically a preparation method of double-layer hollow nitrogen-doped carbon spheres coating copper nanocatalysts, which includes the following steps: (1) Wrap a layer of phenolic resin on the surface of each SiO2 microsphere; (2) Coat the surface of each SiO2 microsphere with a layer of phenolic resin; The product of step (1) is excessively impregnated with melamine and copper salt solutions; (3) SiO2 microspheres are re-wrapped on the surface of the product of step (2), and then the outermost layer is wrapped with a layer of phenolic resin; (4) the product of step (3) is subjected to high-temperature carbonization treatment , the two layers of phenolic resin are carbonized; using HF washing treatment, the SiO2 microspheres are removed; then the product is activated in a hydrogen atmosphere to obtain the catalyst. The catalytic activity is as high as 1670 mg / g∙h. Compared with carbon-coated copper catalysts with simple structure, the catalytic activity and stability are effectively improved. The active components are not easy to agglomerate after the reaction. It is an advanced method for preparing nitrogen-doped hollow carbon spheres. Method for coating 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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