Activated charcoal carried silver phosphotungstomolybdate heteroployacid catalyzer and method for preparing the same and application thereof

Abstract

The present invention discloses an activated carbon supported phosphomolybdic tungsten heteropoly acid silver salt catalyst, and the preparation method and application in ketal synthesis. The catalyst is obtained by treating activated carbon via HNO3, adding the activated carbon into phosphomolybdic tungsten heteropoly acid solution, stirring, adding with AgNO3 solution drip by drip, standing for precipitation adsorption and then drying. The catalyst of the present invention consists of the activated carbon particles with the particle diameter of 75-800 nm loading the phosphomolybdic tungsten heteropoly acid silver salt with the weight occupying 1-50 percent, and is characterized in manageability after reaction, high activity, wide loading range and uniform activated distribution, which is suitable for the generation ketol reaction of ketone and alcohol.

Description

technical field

[0001] The invention relates to a solid acid catalyst and its preparation and application, in particular to an activated carbon-supported phosphomolybdenum tungsten heteropolyacid silver salt catalyst, its preparation method and its application in ketal synthesis. Background technique

[0002] Ketals are important intermediates in the chemical industry, often used in the protection of ketones, and even as special reaction solvents. Ketals have better floral and fruity aromas than parent carbonyl compounds, and most of them have special aromas. They have been widely used as new fragrances in daily chemical and food industries for more than ten years.

[0003] The traditional method for synthesizing ketals is to synthesize ketones and alcohols by direct dehydration under the catalysis of inorganic acids (such as sulfuric acid, hydrochloric acid, phosphoric acid). The rate is high, but they all have strong corrosiveness, severely corrode equipment, produce a se...