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Method for synthesis of novel mesoporous molecular sieve with acidic functional ionic liquid as template agent

A mesoporous molecular sieve and ionic liquid technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of poor stability, small pore size and low acidity of microporous molecular sieves

Inactive Publication Date: 2016-06-15
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the defects of low acidity and poor stability of mesoporous molecular sieves, small pore size and easy blockage of microporous molecular sieves, the present invention provides a method for synthesizing new mesoporous molecular sieves using acid-functionalized ionic liquids as templates

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Preparation of MMS-11 molecular sieve: NaOH, NaAlO 2 , SiO 2 The aqueous solution (mass fraction 30%) and the 25% TEAOH aqueous solution with a molar ratio of n(Al 2 O 3 ) / n(SiO 2 ) / n(Na 2 O) / n(TEAOH) / n(H 2 O)=1.0 / 60 / 2.5 / 22 / 800, mix, stir, then transfer the mixture to the crystallization kettle, and dissolve it at 140°C under self-pressure for 4 hours to obtain Beta zeolite directing agent; Beta zeolite directing agent And [HSO 3 -(CH 2 ) 3 -mim][HSO 4 ] Ionic liquid is added to distilled water (molar ratio is n(ionic liquid) / n(SiO 2 ) / / n(H 2 O)=1.2 / 1 / 85), mix and stir for 30min, add 5ml of absolute ethanol, stir for 12h at 40℃, then transfer it into a stainless steel reactor lined with PTFE, place it in an oven for crystallization at 110℃ for 24 hours, After cooling, suction filtration, washing, drying, and calcination at 550°C for 8 hours, a sample of MMS-11 novel mesoporous molecular sieve was obtained.

Embodiment 2

[0012] Preparation of MMP-12 catalyst: The preparation conditions and steps are the same as in Example 1, except that the ionic liquid is changed to [HSO 3 -(CH 2 ) 3 -NEt 3 ][H 2 PO 4 ], get a sample of MMP-12 new mesoporous molecular sieve.

Embodiment 3

[0014] Preparation of MNS-16 catalyst: The preparation conditions and steps are the same as in Example 1, except that the ionic liquid is changed to [HSO 3 -(CH 2 ) 3 -NEt 3 ][HSO 4 ], get a sample of MNS-16 new mesoporous molecular sieve.

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Abstract

The invention relates to a method for synthesis of a novel mesoporous molecular sieve with acidic functional ionic liquid as the template agent. The method is characterized by: taking self-made beta zeolite as the guiding agent, and respectively adopting synthesized N-methylimidazole ionic liquid [HSO3-(CH2)3-mim][HSO4], [HSO3-(CH2)3-min][H2PO4] and triethylamine ionic liquid [HSO3-(CH2)3-NEt3][HSO4], [HSO3-(CH2)3-NEt3][H2PO4], [HSO3-(CH2)3-NEt3][Cl] as the template agent to synthesize novel molecular sieves MMS-11, MMP-12, MNS-16, MNP-10, and MNC-13 under ion thermal conditions. And all the synthesized samples have a mesoporous structure.

Description

Technical field [0001] The invention belongs to the technical field of molecular sieve catalyst preparation, and mainly relates to a method for synthesizing a novel mesoporous molecular sieve by using an acid-functionalized ionic liquid as a template. Background technique [0002] Mesoporous molecular sieves have a one-dimensional open pore structure, which has obvious advantages in catalyzing macromolecular compounds or heavy raw materials, and by selecting different template agents, the pore size can be effectively controlled, thereby improving the selectivity of products. However, mesoporous molecular sieves also have the disadvantages of low acid strength and poor stability, which greatly limits their practical applications. Microporous molecular sieves have high stability and strong acidity, but the specific surface area and pore diameter are small, the pores are easily blocked and it is not conducive for macromolecular compounds to enter the pores, and only react on the sur...

Claims

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Application Information

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IPC IPC(8): C01B39/04
CPCC01B39/04
Inventor 王志萍于世涛
Owner QINGDAO UNIV OF SCI & TECH
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