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A method for synthesizing hexagonal ordered mesoporous mcm-41 molecular sieves

A technology of MCM-41 and molecular sieve, which is applied in molecular sieve compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of long preparation period, high energy consumption and high preparation cost of hydrothermal method, and achieve short synthesis time and simple operation , low cost effect

Inactive Publication Date: 2019-11-01
GUANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the hydrothermal synthesis method is the main method of MCM-41 molecular sieve, but the preparation cycle of the hydrothermal method is long, the steps are cumbersome, and the energy consumption is high, which leads to the high cost of the current MCM-41 molecular sieve preparation.

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  • A method for synthesizing hexagonal ordered mesoporous mcm-41 molecular sieves
  • A method for synthesizing hexagonal ordered mesoporous mcm-41 molecular sieves
  • A method for synthesizing hexagonal ordered mesoporous mcm-41 molecular sieves

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Embodiment 1

[0046] A method for synthesizing hexagonal ordered mesoporous MCM-41 molecular sieves, the specific steps are as follows:

[0047] S1, get 0.32g cetyltrimethylammonium bromide (CTAB) and be dissolved in the ammoniacal liquor of 32.8ml and the deionized water of 43.2ml, magnetic stirring 1h, fully dissolve CTAB, obtain mixed solution; The concentration of described ammoniacal liquor 25-28g / 100g (commercially available concentrated ammonia water);

[0048] S2, gradually add 2ml of tetraethyl orthosilicate (TEOS) dropwise to the mixed solution obtained in S1, stir during the dropwise addition, stir for 4 hours after the dropwise addition, the stirring speed is 430r / min, gradually produce white color during the stirring process The turbid product is then centrifuged at 10000r / min for 10min to collect the precipitate, then alternately wash the precipitate with deionized water and absolute ethanol, wash once respectively, and finally centrifuge at 10000r / min for 10min to collect the...

Embodiment 2

[0051] A method for synthesizing hexagonal ordered mesoporous MCM-41 molecular sieves, the specific steps are as follows:

[0052] S1, get 0.32g cetyltrimethylammonium bromide (CTAB) and be dissolved in the ammoniacal liquor of 49.2ml and the deionized water of 43.2ml, magnetic stirring 2h, fully dissolve CTAB, obtain mixed solution; The concentration of described ammoniacal liquor 25-28g / 100g (commercially available concentrated ammonia water);

[0053] S2, gradually add 2ml of tetraethyl orthosilicate (TEOS) dropwise to the mixed solution obtained in S1, stir during the dropwise addition, stir for 4 hours after the dropwise addition, the stirring speed is 430r / min, gradually produce white color during the stirring process The turbid product is then centrifuged at 10000r / min for 10min to collect the precipitate, then alternately wash the precipitate with deionized water and absolute ethanol, wash once respectively, and finally centrifuge at 10000r / min for 10min to collect the...

Embodiment 3

[0056] A method for synthesizing hexagonal ordered mesoporous MCM-41 molecular sieves, the specific steps are as follows:

[0057] S1, get 0.32g cetyltrimethylammonium bromide (CTAB) and be dissolved in the ammoniacal liquor of 32.8ml and the deionized water of 43.2ml, stir 1.5h, fully dissolve CTAB, obtain mixed solution; The concentration of described ammoniacal liquor 25-28g / 100g (commercially available concentrated ammonia water);

[0058] S2, gradually add 2.5ml of tetraethyl orthosilicate (TEOS) dropwise to the mixed solution obtained in S1, stir during the dropwise addition, stir for 4 hours after the dropwise addition, the stirring speed is 430r / min, and gradually produce White turbid product, then centrifuge at 10000r / min for 10min, collect the precipitate, then alternately wash the precipitate with deionized water and absolute ethanol, wash once respectively, and finally centrifuge at 10000r / min for 10min, collect the washed precipitate;

[0059] The precipitate was...

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Abstract

The invention belongs to the technical field of MCM-41 molecular sieve synthesis and particularly discloses a method for synthesizing a hexagonal ordered mesoporous MCM-41 molecular sieve. The methodcomprises steps as follows: firstly, CTAB (cetyltrimethyl ammonium bromide) and deionized water are mixed, a solution is formed, then TEOS (tetraethyl orthosilicate) is dropwise added, and the MCM-41molecular sieve with a good long-range ordered hexagonal pore structure is prepared, wherein ideal conditions of sample preparation are as follows: 2.0 ml of TEOS and 32.8 ml of ammonia water are needed, stirring speed is 430 r / min, stirring time is 4 h, calcination is performed at the temperature of 550 DEG for 6 h, and heating rate is 1 DEG C / min. The method is simple to operate, the conditionsare mild, the synthesis time is short, the cost is low, and the method has great application prospect in the fields such as industrial catalysis, biological medicine, adsorption separation, preparation of nanomaterial devices, environmental protection and the like.

Description

technical field [0001] The invention relates to the technical field of MCM-41 molecular sieve synthesis, in particular to a method for synthesizing hexagonal ordered mesoporous MCM-41 molecular sieves. Background technique [0002] MCM-41 molecular sieve has high specific surface area and regular pore structure, and the pore size is adjustable. It is widely used in the fields of industrial catalysis, biomedicine, adsorption and separation, preparation of nanomaterial devices and environmental protection, so it attracts a large number of scholars to study it. [0003] There are many studies on MCM-41 molecular sieves in the prior art, such as (1) using TEOS as a silicon source and CTAB as a template agent, using a co-condensation method to modify MCM-41 molecular sieves with vinyltriethoxysilane to study organic functions The position of the modified group on the surface of the MCM-41 molecular sieve mesoporous material, and through characterization, it is found that most of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B37/00
CPCC01B37/00C01P2002/72C01P2002/82C01P2004/03C01P2004/04C01P2006/12C01P2006/14C01P2006/16
Inventor 何云郭泽平林卿罗之清林锦培
Owner GUANGXI NORMAL UNIV