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Method for synthesizing high stability mesopore molecular sieve using natural clay as material

A mesoporous molecular sieve and natural clay technology, which is applied in the field of hydrothermal synthesis of high-stability mesoporous molecular sieves, can solve the problems of high synthesis cost and poor stability of mesoporous molecular sieves

Inactive Publication Date: 2006-07-12
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to aim at the defect of poor stability and high synthesis cost of mesoporous molecular sieves, and proposes a kind of natural clay and sodium silicate as raw materials, prepared with cetyltrimethylammonium bromide (CTAB) template Method for High Stability Mesoporous Molecular Sieves

Method used

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  • Method for synthesizing high stability mesopore molecular sieve using natural clay as material
  • Method for synthesizing high stability mesopore molecular sieve using natural clay as material
  • Method for synthesizing high stability mesopore molecular sieve using natural clay as material

Examples

Experimental program
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Effect test

Embodiment 1

[0027] According to the proportions of the three raw materials A, B, and C in Table 1, weigh Na-type Lin'an soil and add it to 110ml of deionized water for beating, and then add NaSiO 3 9H 2 O, stirred and dissolved to obtain a suspension, and another 9gCTAB was weighed and added to 50ml water, stirred and dissolved to obtain a colloidal solution, the suspension was slowly dropped into the colloidal solution of CTAB under vigorous stirring, and the volume ratio was 1:1 H 2 SO 4 Adjust the pH value of the mixed solution to 11, continue to stir for 1 hour, add the resulting slurry into a hydrothermal kettle, crystallize at 130°C for 48 hours, cool, filter with suction, wash, dry at 120°C, put it into a muffle furnace, and heat it at 2°C The temperature was raised to 550°C at a rate of 1 / min, and kept at 550°C for 10 hours to obtain mesoporous molecular sieves. The TEM images of the resulting mesoporous molecular sieves all show a mesoporous structure, figure 1 It is the TEM ...

Embodiment 2

[0030] According to the B feeding ratio in Table 1, adopt the same synthesis method as in Example 1, change the crystallization temperature and crystallization time, respectively crystallize at 120°C for 36h, and crystallize at 140°C for 54h. The results show that: 120°C for 36h The specific surface area of ​​the prepared mesoporous molecular sieve is 565m 2 / g; The specific surface area of ​​the mesoporous molecular sieve prepared by crystallization at 140°C for 54h is 590m 2 / g.

Embodiment 3

[0032] The mesoporous molecular sieve synthesized according to the raw material ratio B in Example 1 was calcined at 850°C, and the TEM images all showed a mesoporous structure. figure 2 The TEM picture of the sample synthesized by raw material ratio B after 850°C calcination, and the specific surface area is greater than 250m 2 / g, and the average pore size distribution is around 1.9nm.

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Abstract

The invention synthetic method of high stable molecular screen at raw material of natural clay and inorganic silicate, which is characterized by the following: adding certain quantity of liquid glass in the natural clay and cetyl trimethyl ammonium bromide as mould agent; adjusting pH value equal to 11; synthesizing the Ni dielectric hole molecular screen. The invention possesses high stability and water heat stability.

Description

technical field [0001] The invention relates to a synthesis method of mesoporous molecular sieve using natural clay as raw material, in particular using natural clay and inorganic silicate as raw material, controlling the ratio of the two, and using hexadecyltrimethylammonium bromide as a template Reagent, high stability mesoporous molecular sieves were synthesized by hydrothermal method. Background technique [0002] The traditional synthesis method of mesoporous molecular sieve is hydrothermal method. However, its application is limited due to poor thermal and hydrothermal stability. Ryoo etc. [1] Adding inorganic salts and post-processing during the synthesis of MCM-41, Zhao Dongyuan et al. [2] Use tri-block copolymerization polymer template agent, Tanev, etc. [3] Use neutral surfactants, Karlsson, etc. [4] The stability of mesoporous molecular sieves is improved by using mixed template agents and other methods. Matsumoto et al. [5] Layered sodium silicate (δ-Na 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
Inventor 姜廷顺赵谦殷恒波王晓红陶涛王忠华吴静波
Owner JIANGSU UNIV