Preparation method of micro-mesoporous structure Beta molecular sieve

A mesoporous structure, molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of molecular sieve mesopores and micropores cannot be well connected, the proportion of mesopore dispersion is limited, and it is unfavorable for industrial production. Achieve the effect of reducing complex unknowns, increasing the tendency to escape, and strengthening production practicability

Inactive Publication Date: 2016-12-07
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mesopores and micropores of molecular sieves synthesized by this method are still not well connected, the dispersio

Method used

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  • Preparation method of micro-mesoporous structure Beta molecular sieve
  • Preparation method of micro-mesoporous structure Beta molecular sieve
  • Preparation method of micro-mesoporous structure Beta molecular sieve

Examples

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Effect test

Embodiment 1

[0029] A kind of preparation method of micro-mesoporous structure Beta molecular sieve, comprises the steps:

[0030] 1) Measure tetraethylammonium hydroxide, deionized water, and sodium hydroxide, and stir to obtain a clear solution; among them, the concentration of tetraethylammonium hydroxide is 5%, the measuring amount is 25mL, and the amount of deionized water The amount to be taken is 40mL, the concentration of sodium hydroxide is 6mol / L, and the amount to be taken is 8mL;

[0031] 2) Weigh the gemini surfactant and sodium metaaluminate and dissolve it in the above clear solution, and continue to stir to obtain a clear solution; among them, the gemini surfactant is [C 12 h 25 (CH 3 ) 2 N + (CH 2 ) 6 N + (CH 3 ) 2 C 12 h 25 ][Br - ] 2 , the weighing amount is 7g, and the weighing amount of sodium metaaluminate is 1.3g;

[0032] 3) Weigh fumed silica and add it to the above clarified solution, continue to stir at room temperature for 1 hour to obtain a white ...

Embodiment 2

[0050] A kind of preparation method of micro-mesoporous structure Beta molecular sieve, comprises the steps:

[0051] 1) Measure tetraethylammonium hydroxide, deionized water, and sodium hydroxide, and stir to obtain a clear solution; among them, the concentration of tetraethylammonium hydroxide is 5%, the measured amount is 24.5mL, and the deionized water The measured amount is 50mL, the concentration of sodium hydroxide is 6mol / L, and the measured amount is 7.9mL;

[0052] 2) Weigh the gemini surfactant and sodium metaaluminate and dissolve it in the above clear solution, and continue to stir to obtain a clear solution; among them, the gemini surfactant is [C 12 h 25 (CH 3 ) 2 N + (CH 2 ) 6 N + (CH 3 ) 2 C 12 h 25 ][Br - ] 2 , the weighing amount is 6.5g, and the weighing amount of sodium metaaluminate is 1.6g;

[0053]3) Weigh fumed silica and add it to the above clarified solution, continue to stir at room temperature for 1 hour to obtain a white silica-alumi...

Embodiment 3

[0061] A kind of preparation method of micro-mesoporous structure Beta molecular sieve, comprises the steps:

[0062] 1) Measure tetraethylammonium hydroxide, deionized water, and sodium hydroxide, and stir to obtain a clear solution; among them, the concentration of tetraethylammonium hydroxide is 5%, the measured amount is 24.8mL, and the deionized water The measuring volume is 60mL, the concentration of sodium hydroxide is 6mol / L, and the measuring volume is 8.5mL;

[0063] 2) Weigh the gemini surfactant and sodium metaaluminate and dissolve it in the above clear solution, and continue to stir to obtain a clear solution; among them, the gemini surfactant is [C 12 h 25 (CH 3 ) 2 N + (CH 2 ) 6 N + (CH 3 ) 2 C 12 h 25 ][Br - ] 2 , the weighing amount is 6.8g, and the weighing amount of sodium metaaluminate is 1.8g;

[0064] 3) Weigh fumed silica and add it to the above clarified solution, continue to stir at room temperature for 1 hour to obtain a white silica-al...

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Abstract

The invention discloses a preparation method of a micro-mesoporous structure Beta molecular sieve. The method comprises the steps that tetraethylammonium hydroxide, deionized water and sodium hydroxide are stirred, dimeric surfactant and sodium metaaluminate are dissolved in the mixture to continue to be stirred, finally, gas-phase silicon dioxide is dissolved in the mixture to continue to be stirred, and white silica-alumina colloid is obtained; the white silica-alumina colloid is paced in a reaction kettle to be heated for a reaction, the product is washed, produced and calcined after the reaction is finished, and the micro-mesoporous structure Beta molecular sieve is obtained. The gas-phase silicon dioxide, the sodium metaaluminate, the dimeric hyamine surfactant and the like are used as the raw materials to synthesize the micro-mesoporous structure Beta molecular sieve with the high degree of crystallinity and high specific area. The mesoporous content in the synthesized micro-mesoporous structure Beta molecular sieve is 53.20%, and the micro-mesoporous connectedness is high.

Description

technical field [0001] The invention relates to the technical field of inorganic materials, in particular to a preparation method of a micro-mesoporous Beta molecular sieve. Background technique [0002] Beta molecular sieve has a twelve-membered ring pore structure. Due to its high hydrothermal stability, good shape selectivity and adjustable acidity, it has broad application prospects in industrial catalysis, adsorption separation and ion exchange. However, its pore size (0.3-1.5nm) is small, the pores are intricate, and the diffusion resistance of macromolecular reactants in the pores is relatively large, which is not conducive to the material transport in the reaction, and easily leads to carbon deposition and deactivation. application is limited. In recent years, mesoporous materials have attracted widespread attention because of their high specific surface area, high porosity, and the advantages of diffusion and reaction of macromolecular reactants; however, compared ...

Claims

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Application Information

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IPC IPC(8): C01B39/04
CPCC01B39/04C01P2002/72C01P2004/04C01P2006/12C01P2006/16C01P2006/17
Inventor 谢鲜梅王诗瑶郑子良孙晨贺博吴旭安霞
Owner TAIYUAN UNIV OF TECH
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