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Ordered macroporous-mesoporous multilevel-pore silicon-aluminum molecular sieve Beta monocrystal having opal structure and synthetic method of beta monocrystal

A technology of silica-alumina molecular sieve and synthesis method, which is applied in the direction of crystalline aluminosilicate zeolite, etc., to achieve the effects of enhanced interaction, high specific surface area, and improved selective catalytic performance

Active Publication Date: 2017-01-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing research on single crystals of hierarchically porous zeolite molecular sieves is limited to the construction of a single pore structure, and single crystals of hierarchically porous molecular sieves with both macropores and mesoporous pores have not been reported yet.

Method used

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  • Ordered macroporous-mesoporous multilevel-pore silicon-aluminum molecular sieve Beta monocrystal having opal structure and synthetic method of beta monocrystal
  • Ordered macroporous-mesoporous multilevel-pore silicon-aluminum molecular sieve Beta monocrystal having opal structure and synthetic method of beta monocrystal
  • Ordered macroporous-mesoporous multilevel-pore silicon-aluminum molecular sieve Beta monocrystal having opal structure and synthetic method of beta monocrystal

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Experimental program
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Embodiment 1

[0032] A kind of ordered macroporous-mesoporous multi-level porous silicon-alumina molecular sieve Beta single crystal with opal structure, its synthesis method comprises the following steps:

[0033]Dissolve 0.25g of sodium metaaluminate in a mixed solution formed of 6g of LUDOX HS-30 silica sol (30wt%), 5.3g of tetraethylammonium hydroxide aqueous solution (50wt%) and 1.3g of deionized water, and stir well , to get the original solution of aluminosilicate, in which SiO 2 :Al 2 o 3 :(TEA) 2 O:H 2 O (comprising deionized water and silica sol, the water introduced in the tetraethylammonium hydroxide aqueous solution)=1:0.05:0.3:15, the original solution of the aluminosilicate obtained was aged for 24h, and then added 6g hard template (ordered Macroporous-mesoporous hierarchical porous carbon material, the macropore diameter is 400nm, the mesopore diameter is 20nm) to obtain the mixed solution I, and the mixed solution I is placed in an 80°C water bath and evaporated to dryn...

Embodiment 2

[0035] A kind of ordered macroporous-mesoporous multi-level porous silicon-alumina molecular sieve Beta single crystal with opal structure, its synthesis method comprises the following steps:

[0036] Dissolve 0.16g of aluminum isopropoxide in 4g of LUDOX HS-30 silica sol (30wt%), 1.6g of tetraethylammonium hydroxide aqueous solution (50wt%) and 1.8g of deionized water to form a mixed solution, stir well , to get the original solution of aluminosilicate, in which SiO 2 :Al 2 o 3 :(TEA) 2 O:H 2 O (comprising deionized water and silica sol, the water introduced in the tetraethylammonium hydroxide aqueous solution)=1:0.02:0.14:15, the original solution of the aluminosilicate obtained was aged for 24h, and then added 4g hard template (ordered macroporous-mesoporous hierarchically porous carbon material, the macropore diameter is 400nm, the mesopore diameter is 30nm) to obtain the mixed solution I, and the mixed solution I is placed in an 80°C water bath and evaporated to dryne...

Embodiment 3

[0040] A kind of ordered macroporous-mesoporous multi-level porous silicon-alumina molecular sieve Beta single crystal with opal structure, its synthesis method comprises the following steps:

[0041] Dissolve 0.033g of sodium metaaluminate in the mixed solution of 4g LUDOX HS-30 silica sol (30wt%), 7.4g tetraethylammonium hydroxide aqueous solution (50wt%) and 7.2g deionized water, fully stir, Get the original solution of aluminosilicate, in which SiO 2 :Al 2 o 3 :(TEA) 2 O:H 2 O (comprising deionized water and silica sol, the water introduced in the tetraethylammonium hydroxide aqueous solution)=1:0.01:0.63:38, the original solution of the aluminosilicate obtained was aged for 48h, and then added 4g hard template (ordered Macroporous-mesoporous hierarchical porous carbon material, the macropore diameter is 300nm, the mesopore diameter is 50nm) to obtain the mixed solution I, and the mixed solution I is placed in an 80°C water bath and evaporated to dryness to obtain dry ...

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Abstract

The invention discloses an ordered macroporous-mesoporous multilevel-pore silicon-aluminum molecular sieve Beta monocrystal having an opal structure and a synthetic method of the Beta monocrystal. The ordered macroporous-mesoporous multilevel-pore silicon-aluminum molecular sieve Beta monocrystal is formed by molecular sieve nano structural units connected with one another in a highly-ordered surface-center close-packed manner. By combining a hard template method and a dry-gel conversion method, macroporous and mesoporous pore canals are simultaneously introduced into the Beta molecular sieve monocrystal successfully for the first time. The synthesized ordered macroporous-mesoporous multilevel-pore silicon-aluminum molecular sieve Beta monocrystal has the advantages of a multilevel-pore canal structure and a monocrystal structure, and has extra-large pore volume, relatively high specific surface area, catalytic activity and structural stability, and wide application prospect.

Description

technical field [0001] The invention relates to the technical field of molecular sieve synthesis, in particular to an ordered macroporous-mesoporous multi-level porous silica-alumina molecular sieve Beta single crystal with an opal structure and a synthesis method thereof. Background technique [0002] Beta zeolite molecular sieve is the only high silica zeolite with intersecting twelve-membered ring channel system. Due to the unique pore structure, high acidity and good hydrothermal stability of Beta zeolite, it has been successfully applied in petrochemical fields such as isomerization, alkylation of aromatics and catalytic cracking. However, the narrow pore structure in microporous molecular sieves has become an important defect that limits its further application as a catalyst, especially for the application of macromolecular catalysis. [0003] In order to overcome the limitations of microporous zeolites, the research on molecular sieves with hierarchical pore structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
Inventor 陈丽华孙明慧陈晨邓兆李昱苏宝连
Owner WUHAN UNIV OF TECH
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