Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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

A secondary structural unit, molecular sieve-like technology, applied in the direction of crystalline aluminosilicate zeolite, etc., to achieve good catalytic cracking reaction activity, improved reaction activity, and good catalytic reaction performance

Inactive Publication Date: 2002-05-01
FUDAN UNIV
View PDF0 Cites 13 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
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: 0.25 CTAB: 53 H 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: 0.29 CTAB: 61 H 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).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
crystallinityaaaaaaaaaa
Login to View More

Abstract

A mesoporous or mesopore-micropore molecular sieve as catalytic material containing beta-zeolite secondary structure units is prepared through pre-treating the mixture of raw materials, and adding surfactant to introduce the beta-zeolite secondary structure units to the skeleton of mesoporous molecular sieve to obtain the molecular sieves SBU-MCM-41, SBU-MCM-48 and mesopore-micropore molecular sieve. Its advantages are better catalytic activity and higher 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 units. 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 s...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
Inventor 郭万平李全芝
Owner FUDAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com