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Mesoporous molecular sieve containing Y-zeolite secondary constitutional unit and preparing method thereof

A technology of secondary structural units and mesoporous molecular sieves, applied in molecular sieves and base exchange compounds, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., to achieve improved amorphous structure characteristics, good catalytic performance, and increased acid content Effect

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

[0004] But up to now, the report of this kind of synthetic method is all limited to using single surfactant as template to synthesize corresponding MCM-41 or MCM-48, and there is no report using mixed surfactant as template

Method used

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  • Mesoporous molecular sieve containing Y-zeolite secondary constitutional unit and preparing method thereof
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  • Mesoporous molecular sieve containing Y-zeolite secondary constitutional unit and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Dissolve 0.357g sodium hydroxide and 0.243g sodium metaaluminate in 4ml deionized water, stir and clarify, add 5ml homemade sodium silicate solution (SiO 2 25.4%, Na 2 O7.4%), stir evenly, put it into a sealed polypropylene container, stir and react at 90°C for 18h. Drop the above-mentioned pretreated sol into the mixed aqueous solution of CTAB and SL. At this time, the molar composition of the synthesized mixture is: SiO 2 : 0.06Al 2 O 3 :0.072CTAB:0.012SL:58H 2 O. Then adjust the pH to 11.3 with dilute sulfuric acid, and crystallize at 100°C for 72 hours. The product is filtered, washed, and dried at 80°C to obtain SBU-MCM-41 mesoporous molecular sieve (Si / Al=9).

Embodiment 2

[0030] Weigh 0.357 sodium hydroxide and 0.243g sodium metaaluminate, completely dissolve them in 4ml deionized water to obtain a clear solution, then add 5ml homemade sodium silicate solution (SiO 2 25.4%, Na 2O7.4%), stir evenly, put it into a sealed polypropylene container, stir and react at 120°C for 9h. Drop the above-mentioned pretreated sol into the mixed aqueous solution of CTAB and SL. At this time, the molar composition of the synthesized mixture is: SiO 2 : 0.06Al 2 O 3 : 0.22CTAB: 0.015SL: 98H 2 O. Then adjust the pH to 10.8 with dilute sulfuric acid, and crystallize at 120°C for 40h. The product is filtered, washed, and dried at 80°C to obtain SBU-MCM-41 mesoporous molecular sieve (Si / Al=9).

Embodiment 3

[0032] Dissolve 0.179g sodium hydroxide and 0.122g sodium metaaluminate in 2ml deionized water, stir and clarify, add 2.5ml homemade sodium silicate solution (SiO 2 25.4%, Na 2 O7.4%), stir evenly, put it into a sealed polypropylene container, stir and react at 100°C for 12h. 2.4 ml of sodium silicate solution was added to the obtained sol, and stirring was continued for 12 hours at 100°C. Drop the above-mentioned pretreated sol into the mixed aqueous solution of CTAB and SL. At this time, the molar composition of the synthesized mixture is: SiO 2 : 0.028Al 2 O 3 : 0.16CTAB: 0.013SL: 95H 2 O. Then adjust the pH to 11.0 with dilute hydrochloric acid, crystallize at 120°C for 48h, filter the product, wash, and dry at 80°C to obtain SBU-MCM-41 mesoporous molecular sieve (Si / Al=18).

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Abstract

The invention is a new catalysis material and the manufacturing method for inter-hole molecular sieve containing ª†zeolite secondary unit. The invention carries on preprocess to the composition, then the obtained inorganic precursor is assembled by using basic ion and negative ion surface active agent as template agent. Introduces the secondary unit of ª†zeolite into inter hole molecular sieve frame, and designs the SBU-MCM-41 compound molecular sieve with different silicon-aluminum ratio. The invention reduces the quantity of surface active agent, ití»s easy to operate, and the material has a high water and heat stability and excellent catalysis performance.

Description

Technical field [0001] The invention relates to a kind of mesoporous molecular sieve catalytic material synthesized with Y zeolite secondary structural unit by using mixed cation-anionic surfactant as a template agent and a preparation method thereof. Background technique [0002] Since the researchers of Mobil Corporation used the supramolecular self-assembly of surfactants to synthesize the M41S series of mesoporous molecular sieves in 1992, MCM-41 and MCM-48 mesoporous materials have tuned regular pores, large specific surface area and good Its thermal stability and other characteristics have become a hot topic in the research of catalytic materials. However, compared with traditional microporous zeolite molecular sieves, mesoporous molecular sieves have obvious differences in framework structure. Mesoporous molecular sieves do not have the repeating unit cell structure unit in microporous zeolite. Its internal unit structure is similar to amorphous oxides. It does not contain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24C01B39/48
Inventor 刘苏孔令东李全芝
Owner FUDAN UNIV
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