Method for modifying TS-1 titanium-silicon molecular sieve catalyst

Abstract

The invention relates to a method for modifying a TS-1 titanium-silicon molecular sieve catalyst, which mainly solves the problems that a silanization reagent is easy to hydrolyze to cover the active center of the catalyst and has large consumption, difficult recovery and environmental pollution when being used for processing the TS-1 molecular sieve catalyst in a dipping mode in the prior art. The method better solves the problem by adopting the technical scheme that a TS-1 titanium-silicon molecular sieve catalyst matrix reacts for 0.5-10 hours by leading into the silanization reagent at 50-300 DEG C in a nitrogen atmosphere, and then a modified TS-1 titanium-silicon molecular sieve catalyst is obtained, wherein the silanization reagent is selected from organosilane, organic silylamine, organic silicyl amide or organic silazane, and the dosage of the silanization reagent is 2-20 percent of the weight of the catalyst matrix. The method can be applied to the industrial production of epoxy chloropropane.

Description

technical field [0001] The invention relates to a modification method of a TS-1 titanium-silicon molecular sieve catalyst. Background technique [0002] Titanium-silicon molecular sieves have a regular dispersion environment, a highly uniform internal structure, and special pores, so they have the function of type-selective catalysis. Titanium introduced into the framework reacts with the oxidizing agent H 2 o 2 There is an activation effect, and at the same time, it does not have a significant impact on the chemical stability and thermal stability of the molecular sieve itself, and maintains the good stability of the molecular sieve. [0003] Italian MarcoTarramasso et al first disclosed in 1981 (GB2071071, US4410501) the preparation method of titanium-silicon molecular sieves with MFI structure (TS-1 and ZSM-5 have the same crystal phase structure). However, the small pore size of TS-1 limits the diffusion rate of reactants and product molecules that are similar to or l...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that in the prior art, silylating reagents are used to treat TS-1 molecular sieve catalysts by impregnation. The silylating reagents are easy to hydrolyze and cover the active center of the catalyst, and the solvent consumption is large, difficult to recycle, and pollutes the environment. , to provide a new modification method of TS-1 molecular sieve catalyst