Method for crystallization synthesis of L zeolite molecular sieve with kleit in situ

Abstract

The invention relates to a method which takes kaolin as raw material and synthesizes in-situ crystal into an L zeolite molecular sieve. The method is characterized in that a part of the kaolin is calcined at high temperature to get roasting soil with high temperature, high soil is for short; the other part of the kaolin is roasted at lower temperature to get metakaolin, partial soil is for short; the two kinds of soil are mixed in a certain proportion and then is added into crystal seeds or a directing agent for the process of in-situ crystallization in an alkaline system, finally an L molecular sieve is obtained. The L molecular sieve produced by the method has the characteristic picture diffracted by X ray powder of the L molecular sieve.

Description

A kind of method of synthesizing L zeolite molecular sieve by in-situ crystallization of kaolin technical field The invention belongs to the field of molecular sieve synthesis, and more specifically relates to a method for synthesizing L zeolite molecular sieves by in-situ crystallization using kaolin as a raw material. Background technique L zeolite is widely used, especially platinum-loaded zeolite L, which has much higher activity and selectivity for the aromatization of C6-C8 alkanes than traditional dual-function catalysts. L zeolite catalysts can also directional chlorinate aromatic compounds It has high activity and selectivity, and L zeolite also has good cracking isomerization performance and adsorption performance. Usually, silica sol, potassium silicate or sodium silicate can be used to synthesize L zeolite as the silicon-containing raw material, potassium aluminate or sodium aluminate as the aluminum-containing raw material, and potassium hydroxide or sodium hy...

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