Preparation method of monatomic dispersion catalyst with high catalytic performance

Abstract

The invention belongs to the technical field of catalysis and relates to a method for preparing a monatomic cobalt catalyst by roasting silicon dioxide pellets and immobilizing metalloporphyrin. The method is realized by adopting the following technical scheme: namely stirring and dispersing nano silicon dioxide particles, dropwise adding 3-aminopropyl triethoxy silane, so as to obtain amino modified SiO2 pellets, then linking monocarboxyl metalloporphyrin (CoTPCPP) onto an amino modified SiO2 carrier through organic complexing, carbonizing porphyrin through high-temperature calcination in an inert atmosphere, and loading highly dispersed cobalt atoms onto the amino modified SiO2 pellets, thus an amino modified silicon dioxide pellet loaded monatomic cobalt catalyst is obtained. The monatomic dispersion catalyst has high catalytic activity and stability on a molecular oxygen selective ethylbenzene catalytic oxidation reaction in absence of solvent; meanwhile, a preparation method is simple, and product quality can be easily controlled, so that the monatomic dispersion catalyst is applicable to the fields of alkane selective oxidation reactions and synthesis of medical intermediates.

Description

technical field

[0001] The invention belongs to the field of catalysts, in particular to modified SiO 2 The invention discloses a preparation method of a highly dispersed metal cobalt atom catalyst supported by microspheres. Background technique

[0002] Usually, the active centers of solid catalysts are limited to the exposed atoms on the surface, while a large number of bulk atoms cannot participate in the reaction, resulting in low catalyst activity and waste of active components. Therefore, in order to improve the activity of catalysts and reduce the amount of active ingredients used, in some catalyst preparation processes, the active ingredients can be distributed in a single layer as much as possible by selecting carriers with high specific surface area, such as silica gel, molecular sieves, and activated carbon. However, in the actual catalyst preparation process, due to the high energy of single atoms, agglomeration is prone to occur during calcination or reaction, ...

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