A kind of heteropolyacid salt catalyst with high specific surface area and preparation method thereof

Abstract

The invention belongs to the technical field of catalysts, and in particular relates to a high specific surface area heteropoly acid salt catalyst and a preparation method thereof. The secondary particles of the catalyst prepared by the invention have uniform distribution, small particle size, easy to adjust particle size, greatly increase the specific surface area of ​​the catalyst, simplify the morphology control process of the catalyst, and can improve the catalytic activity of the catalyst and the selectivity of products. ; The catalyst as a whole is composed of small particles with uniform particle size stacked / bridged, and the three-dimensional morphology and structure of each particle have small differences, which can improve the degree of resistance to deformation, thereby improving the mechanical strength of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a high specific surface area heteropoly acid salt catalyst and a preparation method thereof. Background technique [0002] Methyl methacrylate (MMA) is an important chemical product for the production of plexiglass, and also has very important applications in the fields of coatings, rubber, textiles and medical materials, and has a broad market prospect. Compared with the acetone cyanohydrin method that mainly produces MMA at present, the isobutylene oxidation method has the advantages of wide source of raw materials, low pollution, low safety risk, and high atomic utilization rate. It is more in line with the production concept of green chemical industry. gradually rise. In this route, the oxidation of methacrolein (MAL) to methacrylic acid (MAA) is the technical core of the MMA clean production process, but the heteropolyacid catalyst used in this step has poor t...

AI Technical Summary

Problems solved by technology

[0005] Although the above-mentioned various improvement methods have improved the activity of the catalyst to a certain extent, the catalyst particles prepared by the traditional co-precipitation method are large, the specific surface area is small, and a large number of active centers are coated inside the catalyst particles, which cannot provide sufficient reaction. The active site will eventually make the catalytic activity of the catalyst low, resulting in a high initial use temperature of the catalyst, and serious heat accumulation at the hot spot during the reaction process, resulting in excessive oxidation of the reaction and decomposition and deactivation of the catalyst

Although the use of templates can increase the specific surface area of ​​the catalyst, there are problems such as complex preparation process, high cost and poor mechanical strength, which also limit the industrial promotion of the catalyst.

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