Molecular sieve containing secondary structure unit of beta zeolite and its preparing process

A technology of secondary structural units and mesoporous molecular sieves, applied in molecular sieve catalysts, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., to achieve good catalytic cracking reaction activity, improved reaction activity, and good catalytic reaction performance.

Inactive Publication Date: 2006-10-25
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. If the secondary structure of zeolite beta The introduction of units into the framework structure of mesoporous molecular sieves can improve the properties of the amorphous framework structure of mesoporous molecular sieves and effectively increase the acidity of mesoporous molecular sieves. So far, no such work has been reported.

Method used

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  • Molecular sieve containing secondary structure unit of beta zeolite and its preparing process
  • Molecular sieve containing secondary structure unit of beta zeolite and its preparing process
  • Molecular sieve containing secondary structure unit of beta zeolite and its preparing process

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Experimental program
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Effect test

Embodiment 1

[0024] 0.067g pseudo-boehmite (51wt%Al 2 o 3 ) was dissolved in 10.0g tetraethylammonium hydroxide solution (25wt%), then 2.0g fumed silica was added, stirred evenly, and then packed into a stainless steel reaction kettle with a polytetrafluoroethylene liner, at 140°C The reaction was stirred for 22h. The above-mentioned pretreated sol is dropped into the CTAB solution with a concentration of 15.8wt%. At this time, the molar composition of the synthetic mixture is: SiO 2 : 0.01Al 2 o 3 : 0.25(TEA)2 O :0.28CTAB:39H 2 O. Then adjust the pH to 10.5 with dilute sulfuric acid, and crystallize at 100°C for 48h to obtain SBU-MCM-41 mesoporous molecular sieve (SiO 2 / Al 2 o 3 =91.1).

Embodiment 2

[0026] Weigh 0.1g pseudo-boehmite (51wt% Al 2 o 3 ), was dissolved in 7.0g tetraethylammonium hydroxide solution (25wt%), then added 1.5g fumed silica, stirred evenly and then packed into a stainless steel reactor with a polytetrafluoroethylene liner, at 135 ° C The reaction was stirred for 56h. The above-mentioned pretreated sol is dropped into the CTAB solution with a concentration of 14.1wt%. At this time, the molar composition of the synthetic mixture is: SiO 2 : 0.02Al 2 o 3 :0.23(TEA) 2 O: 0.25CTAB: 53H 2 O. Then adjust the pH to 10.0 with dilute sulfuric acid, and crystallize at 95 ° C for 60 h to obtain SBU-MCM-41 mesoporous molecular sieve (SiO 2 / Al 2 o 3 =47.7).

Embodiment 3

[0028] 0.133g pseudo-boehmite (51wt%Al 2 o 3 ) was dissolved in 5.0g tetraethylammonium hydroxide solution (25wt%), then added 1.0g fumed silicon dioxide, stirred evenly and then packed into a stainless steel reactor with a polytetrafluoroethylene liner, at 145 ° C The reaction was stirred for 124h. The above-mentioned pretreated sol is dropped into the CTAB solution with a concentration of 16.2wt%. At this time, the molar composition of the synthetic mixture is: SiO 2 : 0.04Al 2 o 3 :0.25(TEA) 2 O:0.29CTAB:61H 2 O. Then adjust the pH to 10.5 with dilute sulfuric acid, and crystallize at 105°C for 72h to obtain SBU-MCM-41 mesoporous molecular sieve (SiO 2 / Al 2 o 3 =22.4).

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Abstract

The invention relates to a new type of catalytic material of mesopore molecular sieve or mesopore composite molecular sieve containing beta zeolite secondary structure unit and its preparation method. The present invention introduces the secondary structural unit of zeolite beta into the framework of mesoporous molecular sieve by pretreating the synthetic mixture, and then using it as an inorganic precursor to use surfactant supramolecular self-assembly, and successfully designs and synthesizes SBU -MCM-41, SBU-MCM-48 and mesoporous composite molecular sieves. The above novel molecular sieve catalytic material containing the secondary structural unit of zeolite beta has good catalytic reaction performance and high thermal and hydrothermal stability.

Description

technical field [0001] The invention relates to the design and preparation method of a class of mesoporous molecular sieve or mesoporous composite molecular sieve novel catalytic material containing beta zeolite secondary structural unit. Background technique [0002] Since the researchers of Mobil Corporation synthesized M41S series mesoporous molecular sieves by using supramolecular self-assembly of surfactants in 1992, the mesoporous materials (MCM-41 and MCM-48) have been characterized by their adjustable regular channels, large ratio The characteristics of surface area and good thermal stability have become a hot topic in the research of catalytic materials. It is hoped that mesoporous molecular sieves can be used in macromolecular catalytic reactions. However, compared with traditional microporous zeolite molecular sieves, there are obvious differences in the framework structure of mesoporous molecular sieves. Mesoporous molecular sieves have no repeating unit cell st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/04B01J29/00C01B39/04
Inventor 郭万平李全芝
Owner FUDAN UNIV
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