Preparation method of titanium silicalite molecular sieve catalyst with high performance

Abstract

The invention relates to a preparation method of a titanium silicalite molecular sieve catalyst with high performance. The preparation method comprises the following steps of: (1) by taking a silicon source, a titanium source, an organic template and an alkali source as raw materials, synthesizing a micron-sized titanium silicalite molecular sieve A by using a hydrothermal crystallization method; (2) carrying out modification treatment on the titanium silicalite molecular sieve A by using an alkaline solution to obtain a modified molecular sieve B; and (3) preparing a titaniferous modification solution containing the titanium source, the organic template and the alkali source, and carrying out modification treatment on the modified molecular sieve B to obtain the titanium silicalite molecular sieve catalyst C with high performance. By using the preparation method, the problems that the titanium silicalite molecular sieve catalyst prepared in the prior art is high in cost, low in catalytic activity and poor in stability are mainly solved, and the performance of the titanium silicalite molecular sieve catalyst in cyclohexanone-oxime reaction is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic materials, and in particular relates to a preparation method of a high-performance titanium-silicon molecular sieve catalyst. Background technique [0002] In 1983, Taramasso et al. of ENI successfully synthesized the titanium-containing molecular sieve catalyst TS-1 for the first time. In recent years, titanium silicate molecular sieves have become one of the fastest growing fields in molecular sieve science. Similar to ZSM-5 molecular sieve, which is widely used at present, titanium silicon molecular sieve also has MFI topology, which is the product of isomorphic substitution of silicon molecular sieve Silicalite-1 by the transition metal titanium with variable valence characteristics, and the general composition is xTiO 2 (1-x)SiO 2 (0.00<x<0.04mol). The molecular sieve is widely used in many fields such as petrochemical industry and fine chemical industry, and has gre...

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Problems solved by technology

[0006] What the present invention is to solve is the problem of high cost, low catalytic activity and poor stability of the titanium-silicon molecular sieve catalyst prepared by the prior art. The method of silicon molecular sieve catalyst significantly improves the performance of titanium silicon molecular sieve catalyst in the oximation reaction of cyclohexanone

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