Preparation method of core-shell structure CeO2@SiO2 load metalloporphyrin catalyst prepared by double wrapping method

Abstract

The invention relates to a preparation method of core-shell structure CeO2@SiO2 load metalloporphyrin catalyst prepared by double wrapping method, and provides a system for forming the core-shell structure CeO2@SiO2 load metalloporphyrin multi-phase catalyst by double wrapping method. The preparation method comprises the following steps of: stirring and dispersing nanometer cerium oxide particles with surfaces modified by sodium citrate, and adding tetraethyl orthosilicate (TEOS) dropwise to obtain once wrapped core-shell structure CeO2@SiO2; stirring and dispersing the once wrapped core-shell structure CeO2@SiO2 and hexadecyl ammonium bromide; adding mixed solution of the TEOS and 3-aminopropyl triethoxy silicane (APTES) to obtain doubly wrapped core-shell structure CeO2@SiO2; and linking cobalt monocarboxyl porphyrin (CoTMCPP) to a doubly wrapped core-shell structure CeO2@SiO2 carrier by amidation reaction so as to obtain the core-shell structure CeO2@SiO2 load metalloporphyrin catalyst prepared by double wrapping method. The catalyst provided by the invention has higher catalytic activity and stability for selective catalytic oxidation reaction of molecular oxygen on diphenylmethane in the absence of solvent, and the preparation method is simple and product quality is easily controlled, so that the catalyst is suitable for use in the fields such as selective oxidation reaction of hydrocarbon alkyl and synthesis of medicine intermediate and the like.

Description

technical field

[0001] The invention belongs to the field of catalysts, in particular to CeO with core-shell structure prepared by a double wrapping method 2 SiO 2 Preparation method of supported metal porphyrin catalyst. Background technique

[0002] Benzophenone is a commonly used fine chemical product, which is widely used as pharmaceutical intermediates, fragrance fixatives, ultraviolet absorbers for polymer materials, photosensitizers for film coatings, etc. Industrially, the synthesis routes of benzophenone mainly include Friedel-Crafts acylation method, carbonylation method, nitric acid oxidation method, etc. The acylation method requires absolute anhydrous in the reaction process, and 2-3 times the stoichiometric halogenated Brown's acid or Lewis acid is used. The equipment is seriously corroded, and the catalyst cannot be recovered; the carbonylation method not only needs to use toxic raw materials (phosgene ), it also needs to react under high temperature and hi...

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