Catalyst for one-step synthesis of alkyl cyclohexanone from alkylphenol and preparation method thereof

Abstract

The invention relates to a catalyst for synthesizing alkyl cyclohexanone by alkyl phenol in one step and a preparation method thereof. The catalyst comprises an active carbon carrier, and nano active component palladium metal and auxiliary catalytic component alkaline metal or alkaline-earth metal loaded on the active carbon carrier. The preparation method for the catalyst comprises the following steps: after the active carbon is subjected to ultrasonic treatment by nitric acid solution, using deionized water to wash the active carbon to be neutral, adding the active carbon into palladium salt aqueous solution to be ultrasonically soaked, filtering the solution, pulping a filter cake and then reducing the filter cake, evenly distributing nano-scale granules as the active component on the surface of the active carbon carrier, filtering and washing the reactants until no chloride ions exist, then adding the filter cake into alkaline metal or alkaline-earth metal salt solution, pulping, soaking and filtering the filter cake, and drying the filter cake to form a Pd / active carbon catalyst. The preparation method is simple to operate, the palladium / carbon catalyst particles are evenly distributed and are less than 50 nanometers, the catalyst enjoys adjustability, and the catalyst is particularly suitable for the reaction of synthesizing the alkyl cyclohexanone by the alkyl phenol in one step and has high catalytic activity and ketone selectivity.

Description

technical field [0001] The invention relates to a selective hydrogenation catalyst and a preparation method thereof; in particular to a catalyst for one-step synthesis of alkylcyclohexanone from alkylphenol and a preparation method thereof. Background technique [0002] Cyclohexanone is an important chemical product widely used in modern chemical industry, especially in nylon, rubber and other fields. Alkylalkylcyclohexanone is widely used as an important fine chemical intermediate for the synthesis of monomer liquid crystals, medicines, and pesticides. The traditional method for preparing alkylalkylcyclohexanone is to convert alkylphenol into alkylcyclohexanol by catalytic hydrogenation, and then catalyze the oxidation of alkylcyclohexanol to alkylalkylcyclohexanone. This traditional preparation process has the disadvantages of complicated production steps, low product yield, high production cost, and serious environmental pollution. In recent years, with the sharp increa...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a catalyst for the one-step synthesis of alkylcyclohexanone from alkylphenol, its active carbon carrier and auxiliary The catalytic components are used together, so that the catalyst has good catalytic activity for the one-step synthesis of alkylcyclohexanone by hydroisomerization of alkylphenol, high conversion rate of alkylphenol, and high selectivity of product alkylcyclohexanone