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...