Method for preparing composite oxide catalyst of veratrole

Abstract

The invention discloses a method for preparing a composite oxide catalyst of veratrole. A catalyst is KNO3 / gamma Al2O3 SiO2, the preparation method uses a sol-gel method, and is characterized in that aluminium nitrate is dissolved in a glycol aqueous solution, ethyl orthosilicate is slowly dropped under room temperature, mixed liquor is stirred to obtain gel, steps of drying and roasting are carried out to obtain a silicon / aluminum composite oxide catalyst matrix; an active substance KNO3 is loaded on the surface of the matrix by employing an equal-volume dipping method, so that weak alkalescence active site of the catalyst is increased, and the catalytic activity of the reaction of the selectivity of the reaction products can be effectively increased. The method has the advantages of easy acquisition of the raw materials, low cost and no pollution on environment. The composite oxide catalyst has high catalytic activity on a dialkylation reaction of catechol and methanol, and has high catalysis capability on an alkylation reaction of phenol and methanol.

Description

technical field [0001] The invention relates to the technical field of phthalic dimethyl ether composite oxide catalysts, in particular to a method for preparing phthalic dimethyl ether composite oxide catalysts. Background technique [0002] Phthalyl dimethyl ether, also known as Liretrole, is not only an important fine chemical product, but also an important intermediate in medicine, pesticide, and chemical industry, and can also be used as a reagent for the determination of lactic acid in blood and glycerol. Because of its wide application and good market prospect, the research and development of this product is of great value. According to the different raw materials, the synthetic methods include guaiacol method, o-dichlorobenzene method, ortho-haloanisole method, etc., but these methods have high cost, low yield, harsh conditions, and relatively high toxicity. Problems such as large reagents are contrary to the current advocated green chemistry and atomic economy. ...

AI Technical Summary

Problems solved by technology

According to the different raw materials, the synthetic methods include guaiacol method, o-dichlorobenzene method, ortho-haloanisole method, etc., but these methods have high cost, low yield, harsh conditions, and relatively high toxicity. Large reagents and other issues are contrary to the current advocated green chemistry, atomic economy, etc.