Acetophenone hydrogenation catalyst and preparation method thereof

Abstract

The invention relates to an acetophenone hydrogenation catalyst and a preparation method thereof, which comprises the following steps: (1) hydrochloric acid, F127, KCl, 1,3,5-trimethylbenzene and polymethyl methacrylate microspheres are mixed evenly, then tetraethylorthosilicate is added to the mixture, and 4-12 hour later, a sol is obtained; (2) a mixed metal salt solution containing Cu, Mn, Bi and Pb is prepared, a solution of an alkaline precipitant is prepared, the two kinds of solutions are allowed to contact with the obtained sol for precipitation reaction, heating and aging to obtain aslurry; (3) the slurry is subjected to filtering, washing, drying and roasting to obtain composite compound powder; (4) the composite compound powder is mixed with a binder, an alkaline auxiliary agent and a forming auxiliary agent and extruded to obtain the catalyst. The catalyst active component copper prepared by the method has high dispersion, the acidity is weak and mass transfer performanceis good, side reactions such as hydrogenolysis and the like are effectively inhibited, and good activity and selectivity are obtained.

Description

technical field [0001] The invention belongs to the technical field of catalysts, in particular to an acetophenone hydrogenation catalyst and a preparation method thereof. Background technique [0002] α-Phenylethyl alcohol is an important chemical intermediate widely used in the fields of medicine, fragrance manufacturing, cosmetics, food and fine chemicals. The existing α-phenylethanol synthesis methods mainly include microbial fermentation and acetophenone reduction / catalytic hydrogenation. [0003] Microbial fermentation generally uses phenylalanine and fluorophenylalanine as raw materials to produce α-phenylethanol through microbial fermentation conversion; the raw materials used in this method are expensive and the production cost is high. At present, the industrial production of α-phenylethanol usually adopts the hydrogenation method of acetophenone. This method has the advantages of low production cost, less by-products, high product yield, and high product purity, ...

AI Technical Summary

Problems solved by technology

[0010] At present, when the copper-based catalysts prepared by the precipitation method are used for the hydrogenation of acetophenone to prepare α-phenylethanol, there are usually problems such as low dispersion of active component copper, poor catalyst diffusion performance, and strong acidity of the catalyst, resulting in phenylethyl alcohol Low ketone conversion or poor selectivity to α-phenylethanol