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

A technology of kaolin and molecular sieves, applied in the direction of crystalline aluminosilicate zeolite, L-type crystalline aluminosilicate zeolite, etc., can solve the problems of poor flexibility in component modulation, achieve high crystallinity, and reduce the cost of raw materials

Active Publication Date: 2010-12-08
LESHAN SHENGHE RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above method, the synthesis of molecular sieves is carried out after the kaolin is spray-molded into microspheres. When preparing the catalyst, the modulation flexibility of the components is poor.

Method used

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

Examples

Experimental program
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Effect test

example 1

[0024] Take 0.3% (based on the mass of kaolin) L zeolite as a seed crystal, grind it to make it pass through a 0.105mm sample sieve, add distilled water, and disperse with ultrasonic waves for half an hour. Then add 2.6316 grams of white carbon black, 4.5319 grams of potassium hydroxide, 26.8758 grams of distilled water, 2 grams of earth, 8 grams of high earth, stir it evenly, age at room temperature for 24 hours, drop into a stainless steel reactor, heat up to 120°C and stirred at constant temperature for crystallization for 24 hours. After the crystallization is completed, the mother liquor is removed by filtration, washed, and the filter cake is dried to obtain a crystallized product. Its XRD spectrum is attached figure 2 .

example 2

[0026] Get 1 gram of guiding agent, 4.3853 grams of potassium hydroxide, 26.1032 grams of distilled water, 2.8013 grams of white carbon black, 2 grams of partial soil, 8 grams of high soil, stir well and age at room temperature for 24 hours, put it into a stainless steel reaction kettle, and heat up to 120° C. and stirred at constant temperature for 20 hours for crystallization. After the crystallization was completed, the mother liquor was removed by filtration, washed and dried to obtain a crystallized product. Its XRD spectrum is attached figure 2 .

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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

technical field [0001] 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 [0002] L zeolites are widely used, especially platinum-loaded L zeolites, for C 6 ~C 8 The aromatization of alkanes has much higher activity and selectivity than traditional dual-function catalysts. The L zeolite catalyst also has high activity and selectivity for the directional chlorination of aromatic compounds. In addition, the L zeolite has good cracking isomerization Chemical 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 hydroxide is added to form aluminosilicate with a certai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/32
Inventor 郭士岭陈宜俍牛静静詹予忠徐军秦建昭卫冬燕
Owner LESHAN SHENGHE RARE EARTH CO LTD
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