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Pentasil type zeolite molecular sieve synthetic method

A zeolite molecular sieve and a synthesis method technology are applied in the directions of crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc. to achieve the effects of high crystallinity and purity, promotion of crystallization, and small amount of template agent

Inactive Publication Date: 2013-03-13
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of polyether compounds for the synthesis and preparation of pentasil-type zeolite molecular sieves has not been proposed in the prior art

Method used

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  • Pentasil type zeolite molecular sieve synthetic method
  • Pentasil type zeolite molecular sieve synthetic method
  • Pentasil type zeolite molecular sieve synthetic method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A kind of preparation method of pure silicon Silicalite-1 molecular sieve, its concrete steps are as follows:

[0036] (1) Dissolve solid NaOH with deionized water, stir and clarify, then add polyethylene glycol (PEG400) to form a clear solution; add solid silica gel to the above solution, stir for 30-60 minutes, and finally add TPA + guide glue, stir well. In the above reaction mixture, Al in the aluminum source compound 2 o 3 Molar equivalent: SiO 2 The molar equivalent of: alkali source compound: H 2 The molar ratio of O is 0:1:0.055:12. Of which SiO 2 : The mass ratio of guide glue: PEG400 is 1: 5%: 20%.

[0037] (2) Transfer the obtained reaction mixture to a high-pressure reactor for hydrothermal crystallization, and crystallize at 175°C for 12 hours. The crystallized product is filtered, washed with deionized water, dried, etc. to obtain pure silicon containing MFI structure Zeolite molecular sieve.

Embodiment 2

[0044] A kind of preparation method of silicon-aluminum ZSM-11 molecular sieve, its specific steps are as follows:

[0045] (1) Dissolve solid NaOH with deionized water, stir and clarify, then add polyethylene glycol (PEG400) to form a clear solution; add solid silica gel to the above solution, stir for 30-60 minutes, and finally add tetrabutylammonium hydroxide (TBAOH) , stir well. In the above reaction mixture, Al in the aluminum source compound 2 o 3 Molar equivalent: SiO 2 The molar equivalent of: alkali source compound: TBAOH: H 2 The molar ratio of O is 0:1:0.055:0.2:12. Of which SiO 2 The mass ratio of :PEG400 is 1:20%.

[0046] (2) Transfer the obtained reaction mixture to a high-pressure reactor for hydrothermal crystallization, and crystallize at 175°C for 24 hours. The crystallized product is filtered, washed with deionized water, dried, etc. to obtain pure silicon with MEL structure Zeolite molecular sieve.

Embodiment 3

[0052] A kind of preparation method of pure silicon Silicalite-1 molecular sieve, its concrete steps are as follows:

[0053] (1) dilute concentrated sulfuric acid to form dilute sulfuric acid solution A; meanwhile, dissolve sodium silicate nonahydrate (Na 2 SiO 3 9H 2 O) Formation of a clear B solution. Under mechanical stirring, add the clear solution A dropwise to the solution B. After the acid is completely added dropwise, filter the above turbid solution to obtain an amorphous filter cake, and feed the filter cake according to the following formula. Aluminum source compound Middle Al 2 o 3 Molar equivalent: SiO 2 The molar equivalent of: alkali source compound: H 2 The molar ratio of O is 0:1:0.055:35, and finally add TPA + Guide glue, stir for 30-60 minutes until uniform. Of which SiO 2: The mass ratio of guide glue: PEG400 is 1: 5%: 20%.

[0054] (2) Transfer the obtained reaction mixture to a high-pressure reactor for hydrothermal crystallization, and crystal...

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Abstract

The invention belongs to the field of molecular sieve catalytic materials and discloses a pentasil type zeolite molecular sieve synthetic method. The pentasil type zeolite molecular sieve synthetic method comprises the following steps of mixing an aluminum-source compound, an alkali-source compound, a silicon-source compound, an additive, an organic template agent and water, and uniformly stirring to form a reaction mixture; and carrying out hydrothermal crystallization, filtering, washing and drying to obtain pentasil type zeolite molecular sieve, wherein the additive is polyether type compound. The pentasil type zeolite molecular sieve synthetic method disclosed by the invention has the advantages of high crystallization speed, low cost, low template agent consumption and the like, and the synthesized pentasil type zeolite molecular sieve has high degree of crystallinity and purity.

Description

technical field [0001] The invention belongs to the field of molecular sieve catalytic materials, and in particular relates to a method for synthesizing a pentasil type zeolite molecular sieve. Polyether compounds are used as additives to synthesize the molecular sieve. Background technique [0002] Because zeolite molecular sieves have good thermal stability, hydrothermal stability; controllable acidity; Structure and Synthesis of Zeolite Molecular Sieves; Jilin University Press, 1987.; Xu Ruren, Pang Wenqin, Yu Jihong, Huo Qisheng, Chen Jiesheng Molecular Sieves and Porous Materials Chemistry, 2004.; Zeolite Molecular Sieves by Dalian Institute of Physics and Chemistry, Chinese Academy of Sciences, Science Press, 1978. .). In addition to silicon source, aluminum source, titanium source, alkali source and water in the synthesis of molecular sieve, template agent is also indispensable. In the prior art, expensive templates are often used to regulate the crystal morphology ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/36C01B39/40
Inventor 王一萌刘婵娟
Owner EAST CHINA NORMAL UNIV
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