Mesoporous molecular sieve catalyst, preparation method thereof and application thereof in preparing aldehyde ketone

Abstract

The invention discloses a mesoporous molecular sieve catalyst, a preparation method thereof and application thereof in preparing aldehyde ketone by gas-phase catalytic selective oxidation of alcohols. The catalyst is marked as Ag-HMS, wherein the molar ratio of SiO2 to silver is 10-500. In the preparation method for the catalyst, a nonionic surfactant is taken as a template agent, tetraethoxysilane is taken as a silicon source and a water soluble silver salt is taken as a silver source. The catalyst has the advantages that: the silver is introduced, and the unique external circular platy particle feature and internal worm structure of the mesoporous molecular sieve HMS and the high dispersion and superhigh loading capacity of active components silver species are well maintained. The catalyst is applied to gas-phase catalytic selective oxidation of the alcohols, has high activity and good selectivity, and has the conversion rate for the alcohols of between 85 to 100 percent and the selectivity for the aldehyde ketone of over 96 percent which are much higher than those of the conventional related catalysts.

Description

technical field [0001] The invention relates to a mesoporous molecular sieve catalyst. The invention also relates to a preparation method of the catalyst. The invention also relates to the application of the catalyst in gas-phase catalytic selective oxidation of alcohols to prepare aldehydes and ketones. technical background [0002] The oxidation of alcohols to aldehydes and ketones plays an extremely important role in organic synthesis and is widely used in the synthesis of fine chemicals and organic intermediates. The world's annual production of carbonyl compounds exceeds 10 7 Ton, most of these compounds are derived from the oxidation of alcohols, therefore, converting alcohols into corresponding carbonyl compounds such as aldehydes and ketones through some simple and easy methods has very important application value and has been highly valued by chemical workers. . Carbonyl compounds are the products of alcohol oxidation. They are unstable under oxidation condition...

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Problems solved by technology

[0004] The disadvantage of the above catalyst system is that the cost is relatively high, and under gas phase conditions, high selectivity of aldehydes and ketones cannot be obtained at the same time under the condition of high alcohol conversion rate, or the catalyst production process is complicated and the raw materials are expensive, which is not conducive to the production of the chemical industry

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