The preparation method of silicon germanium stf zeolite molecular sieve

A zeolite molecular sieve, silicon germanium technology, which is applied in the direction of molecular sieve catalyst, crystalline aluminosilicate zeolite, molecular sieve and alkali exchange compound, etc., can solve the problems of increasing the preparation cost of STF molecular sieve, complex structure of organic template agent, limited availability, etc. It is easy to promote, enhance the structural orientation, and the effect of strong operability

Active Publication Date: 2021-11-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The organic templates in the above methods are complex in structure and expensive, which greatly increases the preparation cost of STF molecular sieves, thereby limiting their usability in industrial processes.

Method used

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  • The preparation method of silicon germanium stf zeolite molecular sieve
  • The preparation method of silicon germanium stf zeolite molecular sieve
  • The preparation method of silicon germanium stf zeolite molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve 3.5g of germanium oxide in 76.8g of 1,1,2,6-TMPOH aqueous solution (20wt%), add 34.7g of tetraethyl orthosilicate (TEOS), after the hydrolysis is complete, stir the container open overnight to volatilize ethanol and some water until the reaction mixture reaches the final molar composition.

[0025] The above mixture was put into a crystallization kettle with a polytetrafluoroethylene liner, and placed in an oven at 150°C for crystallization for 168 hours. The solid obtained after the reaction is filtered, washed, dried and calcined is STF molecular sieve. The XRD pattern of the sample is as figure 1 As shown, the scanning electron microscope photo is shown as figure 2 shown.

Embodiment 2

[0027] Dissolve 10g of germanium oxide in 105.2g of 1,1,2,6-TMPOH aqueous solution (20wt%), add 41.6g of tetraethyl orthosilicate (TEOS), after the hydrolysis is complete, stir the container open overnight to volatilize ethanol and portion of water until the reaction mixture reaches the final molar composition.

[0028] The above mixture was put into a crystallization kettle with a polytetrafluoroethylene liner, and placed in an oven at 175°C for crystallization for 96 hours. The solid obtained after the reaction is filtered, washed, dried and calcined is STF molecular sieve.

Embodiment 3

[0030] Dissolve 1.9g of germanium oxide in 45.5g of 1,1,3,5-TMPOH aqueous solution (20wt%), add 37.9g ​​of tetraethyl orthosilicate (TEOS), after the hydrolysis is complete, stir the container open overnight to volatilize ethanol and some water until the reaction mixture reaches the final molar composition.

[0031] The above mixture was put into a crystallization kettle with a polytetrafluoroethylene liner, and placed in an oven at 160°C for crystallization for 180 hours. The solid obtained after the reaction is filtered, washed, dried and calcined is STF molecular sieve.

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Abstract

The invention relates to a preparation method of a silicon-germanium STF zeolite molecular sieve, which mainly solves the problem that the organic template used for synthesizing the STF molecular sieve is too complex in the prior art. The present invention comprises the step of contacting silicon source, germanium source, organic template R, water and optionally, heteroatom element X source under crystallization conditions to obtain molecular sieve; and optionally, roasting the obtained The step of the molecular sieve; The organic template R is containing tetramethylpiperidinium cation TMP + Quaternary ammonium salt or quaternary ammonium base to obtain porous STF zeolite molecular sieve material. The invention uses an organic template agent with a simple structure; the synthesis range is wide, the operation is simple and easy, and the promotion is convenient.

Description

technical field [0001] The invention relates to a method for synthesizing zeolite molecular sieves, more precisely, to a method for synthesizing STF zeolite molecular sieves. [0002] technical background [0003] Zeolite molecular sieves are crystalline porous silicate materials that are widely used as adsorbents, ion exchangers, and industrial catalysts. At present, there are 235 molecular sieve topologies approved by the International Molecular Sieve Association. [0004] STF molecular sieve has a one-dimensional 10-membered ring channel structure, and the channel direction is [001]. The earliest molecular sieve with STF topology is SSZ-35. Chevron disclosed in U.S. Patent US 5316753 the use of various conformationally restricted azapolycyclic ring systems as templates to prepare SSZ-35, including 3,3-dimethyl-3-azonium-7- Methyl-7-aza-bicyclononane, N-ethyl-N-methyl-9-azoniumbicyclo[3.3.1]nonane and 1,3,3,8,8-pentamethyl-3 - Azonia bicyclo[3.2.1]octane. The company a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/48C01B39/08C01B39/06B01J20/18B01J20/10B01J29/70B01J29/89B01J29/88
CPCB01J20/10B01J20/18B01J29/70B01J29/88B01J29/89B01J2229/183C01B39/06C01B39/08C01B39/48
Inventor 付文华袁志庆王振东滕加伟赵胜利
Owner CHINA PETROLEUM & CHEM CORP
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