Granular titanium-silicon molecular sieve catalyst and preparation method thereof

Abstract

The invention discloses a granular titanium-silicon molecular sieve catalyst and a preparation method thereof. The granular titanium-silicon molecular sieve catalyst is prepared by using the following method: hydrochloric acid is added into water, the mixture is stirred and added with a glycol-propylene glycol-glycol copolymer, ethyl orthosilicate is dropped after the glycol-propylene glycol-glycol copolymer is dissolved, titanium-silicon molecular sieve fine powder is added into the mixture after the ethyl orthosilicate is completely hydrolyzed to be evenly mixed into a slurry state substance; and the slurry state substance is calcined for 5 to 30 hours in the air at 500 to 950 DEG C to obtain the granular titanium-silicon molecular sieve catalyst which has a middle hole, is covered witha silica gel layer and has a particle diameter of 5mu m to 75mu m. The granular titanium-silicon molecular sieve catalyst prepared by the invention has large particle diameter and high strength, is not easy to pulverize, is easy to separate after catalyzed reaction is completed, keeps the catalysis property of the titanium-silicon molecular sieve fine powder and is used for preparing propylene oxide by catalyzing propylene ring oxidation, and the oxydol conversion rate and the propylene oxide selectivity of the granular titanium-silicon molecular sieve catalyst approach to those of titanium-silicon molecular sieve fine powder.

Description

Granular titanium-silicon molecular sieve catalyst and preparation method thereof technical field The invention relates to a titanium-silicon molecular sieve catalyst and a preparation method, in particular to a granular titanium-silicon molecular sieve catalyst and a preparation method. Background technique Titanium silicate molecular sieve (TS-1) is a new type of catalytic oxidation catalyst, which can be used to catalyze the epoxidation of olefins to prepare olefin epoxides, catalyze the ammoximation of ketones to prepare the corresponding ketoximes, and catalyze the oxidation of phenols to prepare the corresponding quinone etc. The oxidation reaction catalyzed by titanium-silicon molecular sieve has high product selectivity and few by-products. Titanium-silicon molecular sieve fine powder is synthesized by using tetrapropylammonium hydroxide as template, titanate as titanium source, and tetraethyl silicate as silicon source, with a particle size of 0.1-0.3 μm (US4410...

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Problems solved by technology

In summary, due to the low strength of the granular titanium-silicon molecular sieve catalyst prepared by the existing method for preparing granular titanium-silicon molecular sieve, it is easy to break when used in a slurry reactor due to stirring, and it is not easy to separate after the reaction; or because the titanium-silicon molecular sieve Some of the active centers are covered, resulting in a decline in catalytic performance, unable to meet the application requirements

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