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Mesoporous molecular sieve cortaining beta zeolite secondary constitutional unit and preparing method thereof

A secondary structural unit, mesoporous molecular sieve technology, applied in molecular sieves and alkali exchange compounds, chemical instruments and methods, non-metallic elements, etc., can solve problems such as unseen

Inactive Publication Date: 2004-04-14
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The secondary structural unit of zeolite beta is composed of two single four-membered rings and a double 5-3 ring, and its largest one-dimensional geometric size is much smaller than the pore wall thickness of mesoporous molecular sieves. When introduced into the framework structure of mesoporous molecular sieves, the amorphous structure characteristics of the mesoporous molecular sieve framework can be significantly improved, and the thermal and hydrothermal stability and acidity of the mesoporous molecular sieves can be effectively improved. Both are limited to using a single surfactant as a template to synthesize the corresponding MCM-41 or MCM-48, and there is no mesoporous molecular sieve catalyst containing zeolite secondary structural units synthesized by using a mixed cation-nonionic surfactant as a template. material report

Method used

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  • Mesoporous molecular sieve cortaining beta zeolite secondary constitutional unit and preparing method thereof
  • Mesoporous molecular sieve cortaining beta zeolite secondary constitutional unit and preparing method thereof
  • Mesoporous molecular sieve cortaining beta zeolite secondary constitutional unit and preparing method thereof

Examples

Experimental program
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Effect test

example 1

[0022] 0.134g pseudo-boehmite (51wt%Al 2 o 3) was dissolved in 5.0g of 25wt% tetraethylammonium hydroxide solution, then 1.0g of white carbon black was added, stirred evenly, then put into a stainless steel reaction kettle with a polytetrafluoroethylene liner, and stirred and reacted in an oil bath at 135°C 131h. Add the above-mentioned pretreated precursor dropwise to the mixed solution of CTAB and OP-10. At this time, the molar composition of the synthetic mixture is: 1.0SiO 2 : 0.04Al 2 o 3 :0.25(TEA) 2 O: 0.21CTAB: 0.04OP-10: 96H 2 O. Then adjust the pH to 9.0 with dilute sulfuric acid, and crystallize at 110 °C for 36 h to obtain the initial gel SiO 2 / Al 2 o 3 25 SBU(β)-MCM-41 mesoporous molecular sieve.

example 2

[0024] Weigh 0.0335g pseudo-boehmite (51wt%Al 2 o 3 ), dissolved in 5.0g 25wt% tetraethylammonium hydroxide solution, then add 1.0g white carbon black, stir evenly and put it into a stainless steel reaction kettle with a polytetrafluoroethylene liner, stir and react at 150°C 16h. Add the above-mentioned pretreated precursor dropwise to the mixed solution of CTAB and OP-10. At this time, the molar composition of the synthetic mixture is: 1.0SiO 2 : 0.01Al 2 o 3 :0.25(TEA) 2 O: 0.12CTAB: 0.04OP-10: 96H 2 O. Then adjust the pH to 9.5 with dilute sulfuric acid, and crystallize at 95 °C for 32 h to obtain the initial gel SiO 2 / Al 2 o 3 100 SBU(β)-MCM-41 mesoporous molecular sieve.

example 3

[0026] 0.0335g pseudo-boehmite (51wt%Al 2 o 3 ) was dissolved in 4.52g of 25wt% tetraethylammonium hydroxide solution, and then 1.0g of white carbon black was added, stirred evenly, put into a stainless steel reaction kettle with a polytetrafluoroethylene liner, and stirred and reacted at 135°C for 23h. Add the above pretreated precursor dropwise to the mixed solution of CTAB and OP-10, then the molar composition of the synthetic mixture is: 1.0SiO 2 : 0.01Al 2 o 3 :0.23(TEA) 2 O: 0.34CTAB: 0.043OP-10: 64H 2 O. Then adjust the pH to 11.8 with dilute sulfuric acid, and crystallize at 105 °C for 68 h to obtain the initial gel SiO 2 / Al 2 o 3 100 SBU(β)-MCM-48 mesoporous molecular sieve.

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Abstract

The invention is inter hole molecular sieve containing ª‰zeloite secondary unit. The invention uses mixed aqueous solution of hexadecyl trimethyl ammonium bromide (CTAB, basic ion surfactant) and polyethylene glycol capryl phenyl ether (OP-10, nonionics) as template agent, uses precursor ofª‰zeloite secondary unit as silicon-aluminum source, it synthesizes the sieve whose secondary unit has a high heat and water stability and high acidic property through super molecular self-assembling method of surface active agent. The invention has using value.

Description

technical field [0001] The invention relates to a kind of mesoporous molecular sieve catalytic material containing beta zeolite secondary structural unit prepared by using mixed cationic-nonionic surfactant as a template and a preparation method thereof. Background technique [0002] Microporous molecular sieves have a uniform pore structure and strong acidity, and play a very important role in acid-catalyzed reactions, but their small pore size limits the access of larger molecules to the active centers in the micropores, making it difficult to achieve macromolecular sieves. catalytic conversion. As petroleum becomes heavier, it is particularly urgent to seek molecular sieve catalytic materials with larger pore sizes. In 1992, researchers from Mobil Corporation used the supramolecular self-assembly of surfactants to synthesize the M41S series of mesoporous molecular sieves for the first time. The hexagonal phase MCM-41 and the cubic phase MCM-48 are two important members. ...

Claims

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Application Information

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IPC IPC(8): C01B39/48
Inventor 孔令东刘苏李全芝
Owner FUDAN UNIV
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