C@TiO2 solid acid catalyst in core-shell structure and preparation method thereof

Abstract

The invention belongs to the preparation field of catalysts, and in particular relates to a C@TiO2 solid acid catalyst in a core-shell structure and a preparation method of the C@TiO2 solid acid catalyst. The main preparation process is as follows: reacting biomass and tetrabutyl titanate serving as raw materials for 6-24 hours at 100-200 DEG C, drying and pyrolyzing the product to obtain a catalyst precursor in the core-shell structure, sulfonating the catalyst precursor through sulfuric acid, and drying to obtain the C@TiO2 solid acid catalyst in the core-shell structure. The catalyst has good catalysis activity and stability in acid alcohol esterification and transesterification. The raw material for the catalyst disclosed by the invention is cheap and easy to obtain, the performance is stable, and the large-scale production can be realized. Furthermore, the catalyst solves the common fault that the normal metallic oxide solid acid catalyst is easy to inactivate, and meanwhile, the acid density is increased, so that the acid strength is greatly prompted, the catalysis effect is good, and the catalyst is reusable and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of preparation of catalysts, in particular to CTiO with a core-shell structure 2 Solid acid catalyst and its preparation method. Background technique [0002] In the chemical industry, many reactions need to be carried out under acid-catalyzed conditions, such as hydrocarbon cracking, alkyl isomerization, hydrolysis, alkyd esterification and transesterification. Traditional acid catalysts are mainly inorganic liquid acids, mainly HF, HCl, H 2 SO 4 、H 3 PO 4 etc., although the catalytic effect of these liquid acid catalysts is better, there are many weak points. For example, it is extremely easy to corrode equipment, endanger the safety of operators, can only be applied to batch processes, has poor product selectivity, and the separation steps from products are complicated. In addition, it will inevitably cause serious environmental pollution, especially in the environment where the "green chemical industry" is v...

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Problems solved by technology

Many researchers have noticed this and vigorously developed solid acid catalysts. Although there are many types of solid acids that have been developed, they also have certain defects. The main problem is that the acid content is less, the acid density is lower, and the effect is better. The solid acid also has problems such as high cost or harsh preparation conditions, so that it is difficult for industrial application