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Double mesopore molecular sieve and its preparation method

A molecular sieve and double mesoporous technology, which is applied in the fields of double mesoporous molecular sieve and its preparation, inorganic synthesis and catalysis science, can solve the problems of long reaction time, environmental pollution, complex processing steps, etc., and achieve simple operation, rich types and conditions mild effect

Inactive Publication Date: 2002-11-20
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art (patent publication numbers: CN1304871A and CN1304872A) utilizes nonionic surfactants as templates to obtain a double-porous molecular sieve through hydrolysis and condensation of silicon sources, but the synthesis process requires two organosilicon compounds as silicon sources. The environment is polluted, and relatively complicated processing steps and long reaction time are required. The pore size distribution of the obtained double-pore molecular sieve is located in the mesopore area and the macropore area respectively, and the pore distribution is also wide.

Method used

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  • Double mesopore molecular sieve and its preparation method
  • Double mesopore molecular sieve and its preparation method
  • Double mesopore molecular sieve and its preparation method

Examples

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example 1

[0040]At a constant stirring speed, add a certain amount of ethyl tetrasilicate dropwise into the aqueous solution in which the surfactant TTAB is dissolved, and continue to stir for 5 minutes until the mixture is evenly mixed, and then add a given amount of concentrated solution dropwise under stirring. Ammonia, so that the pH of the system is 9.5, and the molar composition is obtained as SiO 2 : 0.185TTAB : 0.18NH 3 ·H 2 O: 100H 2 O mixture. After the mixture was continuously stirred at room temperature for 6 hours, it was centrifuged, washed, dried and ground to obtain a synthetic double mesoporous molecular sieve. Gradually raise the temperature to 550°C and bake for 6 hours in an air atmosphere to obtain a double mesoporous molecular sieve. Its typical N 2 Adsorption-desorption isotherms and corresponding pore distribution curves are shown in figure 1 . Example 2:

example 2

[0041] Dissolve a certain amount of surfactant CTAB in water at a constant stirring speed, raise the temperature slightly (30-40°C) to completely dissolve CTAB into a uniform and clear solution, and then add a certain amount of orthosilicate dropwise under stirring In the CTAB solution, continue to stir for 5 minutes until the mixture is evenly mixed, and finally add a given amount of concentrated ammonia water drop by drop under stirring, so that the pH of the system is 9.5, and the molar composition is obtained as SiO 2 : 0.185CTAB : 0.6NH 3 ·H 2 O: 100H 2 O mixture. After the mixture was continuously stirred at room temperature -40°C for 6 hours, it was centrifuged, washed, dried, and ground to obtain a synthetic double mesoporous molecular sieve. Gradually raise the temperature to 550°C and bake for 6 hours in an air atmosphere to obtain a double mesoporous molecular sieve. Its typical XRD pattern, TEM photo, N 2 Adsorption-desorption isotherms and corresponding pore ...

example 3

[0042] Dissolve a certain amount of surfactant CTAB in water at a constant stirring speed, raise the temperature slightly (30-40°C) to completely dissolve CTAB into a uniform and clear solution, and then add a certain amount of tetraethyl orthosilicate dropwise under stirring In the CTAB solution, continue to stir for 5 minutes, then add a quantitative amount of co-solvent mesitylene (TMB), stir until the mixture is evenly mixed, and finally add a given amount of strong ammonia dropwise under stirring, so that the pH of the system is 9.5, to obtain Molar composition as SiO 2 : 0.185CTAB : 0.32TMB : 0.6NH 3 ·H 2 O: 100H 2 O mixture. After the mixture was continuously stirred at room temperature -40°C for 6 hours, it was centrifuged, washed, dried, and ground to obtain a synthetic double mesoporous molecular sieve. Gradually raise the temperature to 550°C and bake for 6 hours in an air atmosphere to obtain a double mesoporous molecular sieve.

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Abstract

The present invention relates to a double-mesopore molecular sieve and its preparation method, belonging to the field of chemical synthesis technology, and is characterized by that the double-pore pore size distributions of said material are being in the mesopore zone, so that said material can effectively meet the requirements to the catalyst pore size distribution for macromolecualr shape selection and diffusion effect, and is a potential industrial catalyst and catalyst carrier. Its preparation method uses quaternary ammonium salt cationic surfactant as template agent, and in the weak alkaline system utilizes the room-temp. hydrolysis and condensation polymerization of ethyl metasilicate to synthesize the invented double-mesopore distribution molecular sieve.

Description

1. Technical field [0001] The invention relates to a double mesoporous molecular sieve and a preparation method thereof, which belong to the synthesis of a chemical substance and its synthesis method, and relate to the category of inorganic synthesis and catalysis science, specifically, the synthesis of a new catalyst and its carrier and its Corresponding new synthetic methods. 2. Background technology [0002] With the further deepening of petrochemical industry and fine chemical industry and the vigorous development of coal chemical industry, more and more catalytic reactions involving macromolecules are required, which requires that the geometric diameter of catalyst pores must be larger than the effective kinetic diameter of these molecules, while traditional zeolites Molecular sieves have been difficult to play an active role in this field due to the limitation of their pore size. In 1992, researchers from the Mobil Corporation of the United States first reported the u...

Claims

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Application Information

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IPC IPC(8): C01B37/02
Inventor 王晓钟窦涛
Owner TAIYUAN UNIV OF TECH
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