A kind of titanium silicon molecular sieve and its synthesis method and application and a kind of method of cyclic ketone oxidation

Abstract

The invention relates to the field of catalytic materials and in particular provides a titanium silicalite molecular sieve, a preparation method and application of the titanium silicalite molecular sieve. The titanium silicalite molecular sieve is composed of the following elements: precious metals, silicon, titanium and oxygen, wherein the I960 / I550 value of the titanium silicalite molecular sieve is 0.5-0.9; the U480 / U330 value of the titanium silicalite molecular sieve is 0.5-5; and the N-117 / N-114 value of the titanium silicalite molecular sieve is 0.01-0.25. The invention further providesa cyclic ketone oxidation method. The cyclic ketone oxidation method comprises the following step: contacting cyclic ketone, an oxidizing agent and a catalyst, wherein the catalyst contains the titanium silicalite molecular sieve disclosed by the invention. Compared with the prior art, the titanium silicalite molecular sieve disclosed by the invention has the advantages that diffusion of the reactants and product is facilitated in an oxidation reaction, so that oxidative activity is fully achieved, and the selectivity is improved. For example, when applied to a reaction in which ring molecules, particularly cyclic ketone molecules, participate or are produced, the titanium silicalite molecular sieve can achieve excellent catalytic effects. Moreover, filtration and separation of the catalyst after the reaction can be further facilitated, and industrialized application is easily realized.

Description

technical field [0001] The invention relates to a titanium-silicon molecular sieve, its synthesis method and application, and a method for oxidizing cyclic ketones. Background technique [0002] Titanium-silicon molecular sieve is an important catalytic oxidation material. For example, titanium-silicon molecular sieve TS-1 with MFI crystal structure is a kind of transition metal element titanium introduced into the molecular sieve framework with ZSM-5 structure, which has excellent catalytic selective oxidation performance. A new type of titanium silicate molecular sieve. TS-1 not only has the catalytic oxidation effect of titanium, but also has the shape-selective effect and excellent stability of ZSM-5 molecular sieve. Since TS-1 molecular sieve can use non-polluting low-concentration hydrogen peroxide as an oxidant in the oxidation reaction of organic matter, it avoids the problems of complex oxidation process and environmental pollution, and has incomparable energy savi...

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Problems solved by technology

[0004] In the existing technology for preparing titanium-silicon molecular sieves (such as GB 2071071A, USP 4410501, and Zeolites, 1992, Vol.12:943), the crystallization time for preparing titanium-silicon molecular sieves is relatively short due to the weak crystal guiding ability of Ti itself. long and low yield

In recent years, although the technology of preparing titanium-silicon molecular sieve has been improved to some extent (such as CN101134575A, CN1247771A), the effect is not very satisfactory

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