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Composite method of mesoporous A type molecular sieve

A synthesis method and molecular sieve technology are applied in the directions of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., and can solve the problems of low mass transfer rate and the like

Active Publication Date: 2013-01-16
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low mass transfer rate of existing A-type molecular sieves in the process of adsorption, separation and catalysis, the present invention provides a method for synthesizing mesoporous A-type molecular sieves with high crystallinity, good stability and high BET specific surface area

Method used

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  • Composite method of mesoporous A type molecular sieve
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  • Composite method of mesoporous A type molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1 g of multi-walled carbon nanotubes was impregnated with 20 ml of KH-560 solution with a mass fraction of 5% for 1 hour, filtered with suction, and dried at 100°C for 10 minutes to obtain treated multi-walled carbon nanotubes M1; 0.75 g of Na 2 SiO 3 9H 2 O, 3ml of water, 0.1g of M1 and 0.1g of KH-660 were stirred at 70°C for 3 hours, and the resulting mixture was added to 3ml of sodium metaaluminate solution with a mass fraction of 11%, and transferred to polytetrafluoroethylene after stirring for 0.5 hours In a lined reactor, crystallize at 100°C for 15 hours, wash with suction, dry at 100°C, and then calcinate at 550°C for 15 hours to obtain the final product. The pore structure parameters of the obtained samples are listed in Table 1.

Embodiment 2

[0027] 1 g of multi-walled carbon nanotubes was impregnated with 20 ml of KH-560 solution with a mass fraction of 5% for 1 hour, filtered with suction, and dried at 100°C for 10 minutes to obtain treated multi-walled carbon nanotubes M1; 0.75 g of Na 2 SiO 3 9H 2 O, 3ml of water, 0.3g of M1 and 0.3g of KH-660 were stirred at 70°C for 3 hours, and the resulting mixture was added to 3ml of sodium metaaluminate solution with a mass fraction of 11%, and transferred to polytetrafluoroethylene after stirring for 5 hours In a lined reactor, crystallize at 100°C for 15 hours, wash with suction, dry at 100°C, and then calcinate at 550°C for 15 hours to obtain the final product. The pore structure parameters of the obtained samples are listed in Table 1.

Embodiment 3

[0029] 1 g of multi-walled carbon nanotubes was stirred and impregnated with 20 ml of 5% KH-560 solution for 1 hour, filtered with suction and dried at 100°C for 10 min to obtain treated multi-walled carbon nanotubes M1; 0.46 g of TEOS (orthosilicon ethyl acetate), 3ml of water, 0.1g of M1 and 0.1g of KH-660 were stirred at 70°C for 3 hours, and the resulting mixture was added to 3ml of sodium aluminate solution with a mass fraction of 11%, stirred for 12 hours, and then transferred to polytetrafluoroethylene Crystallize at 100°C for 15 hours in a vinyl fluoride-lined reactor, wash with suction, dry at 100°C, and then calcinate at 550°C for 15 hours to obtain the final product. The pore structure parameters of the obtained product are shown in Table 1.

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Abstract

The invention discloses a composite method of a mesoporous A type molecular sieve. The composite method comprises the following steps: stirring and infusing multiwalled carbon nanotubes on the surface of template agent with silane coupling agent solution; adding the multiwalled carbon nanotubes processed with the silane coupling agent solution into a silicon source while adding another kind of silane coupling agent solution; processing the mixture under a heating condition to impel the mixture to react; transferring the mixture to an aluminum source after the reaction is finished; and removing template agent to obtain mesoporous A type molecular sieve through high temperature calcinations after stirring, crystallization, suction, filtration, cleaning and drying. According to the invention, the process method of the multiwalled carbon nanotubes is novel, the silane coupling agents are various, and the mesoporous A type molecular sieve obtained according to the method is high in heat stability.

Description

technical field [0001] The invention relates to a method for synthesizing a mesoporous A-type molecular sieve, in particular to a method for synthesizing a mesoporous A-type molecular sieve with high hydrothermal stability. Background technique [0002] The existing A-type molecular sieve is a kind of microporous molecular sieve, which has good adsorption and ion exchange performance, and has high thermal stability and catalytic performance. However, existing Type A molecular sieves have a pore size of only about 4.2 angstroms, which is smaller than the molecular diameter of most hydrocarbons. However, under normal circumstances, the reaction product is usually larger than the pore size of the molecular sieve, so the generated product molecules cannot diffuse out, and it is easy to coke, thereby deactivating the molecular sieve. Not only that, even if the product can be produced, the pore size of the A-type molecular sieve seriously affects the mass transfer rate of the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/14
Inventor 李福祥袁景彬于锋薛建伟吕志平
Owner TAIYUAN UNIV OF TECH
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