A worm-like mesoporous al 2 o 3 / Molecular sieve composite material and preparation method thereof

A technology for composite materials and molecular sieves, applied in the field of worm-like mesoporous Al2O3/molecular sieve composite materials and its preparation, can solve the problems of low diffusion of microporous molecular sieves, increased synthesis costs, complicated preparation methods, etc. The method is simple, feasible, Ease of regulation and broad application prospects

Active Publication Date: 2020-08-04
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the above invention patents have obtained some hierarchical porous composite materials, which can solve the problem of low diffusion of conventional microporous molecular sieves to a certain extent, the preparation method is still too complicated, which increases the cost of synthesis to a certain extent.

Method used

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  • A worm-like mesoporous al <sub>2</sub> o <sub>3</sub> / Molecular sieve composite material and preparation method thereof
  • A worm-like mesoporous al <sub>2</sub> o <sub>3</sub> / Molecular sieve composite material and preparation method thereof
  • A worm-like mesoporous al <sub>2</sub> o <sub>3</sub> / Molecular sieve composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] A worm-like mesoporous Al 2 o 3 / Molecular sieve composite material, its preparation method comprises the steps:

[0035] 1) Synthesis of microporous nano-molecular sieves: Add 11.4g TPAOH (40wt%) solution and 20g TEOS to 30g deionized water successively, stir for 3h, make it uniformly mixed, obtain a clear solution, pour the resulting solution into the reaction kettle, Heating to 100°C for crystallization for 24 hours, washing the crystallized product, drying it, and roasting it in a muffle furnace at 550°C for 6 hours to obtain a microporous nanomolecular sieve;

[0036] 2) Add 0.2 g of the obtained microporous nano-molecular sieve to 100 mL of ethanol, and sonicate for 5 hours to obtain a monodisperse uniform mixed solution I;

[0037] 3) Add 2g of aluminum sec-butoxide to 100mL of ethanol, stir for 5min to fully mix to obtain the mixed solution II;

[0038] 4) Slowly add the obtained mixed solution II into the mixed solution I, keep the solution I stirring contin...

Embodiment 2

[0042] A worm-like mesoporous Al 2 o 3 / Molecular sieve composite material, its preparation method comprises the steps:

[0043]1) Synthesis of microporous nano-molecular sieves: sequentially add 11g TPAOH (40wt%) solution, 20g silica sol (30wt%) to 16g deionized water, stir for 4h, make it evenly mixed, obtain a clear solution, pour the resulting solution into In a reaction kettle, heat to 110°C for crystallization for 20 hours, wash the crystallized product, dry it, and place it in a muffle furnace at 550°C for 7 hours to obtain a microporous nanomolecular sieve;

[0044] 2) Add 0.2 g of the obtained microporous nano-molecular sieve to 100 mL of ethanol, and sonicate for 6 hours to obtain a monodisperse uniform mixed solution I;

[0045] 3) Add 2g of aluminum sec-butoxide to 100mL of ethanol, stir for 2min to fully mix to obtain the mixed solution II;

[0046] 4) Slowly add the obtained mixed solution II to the mixed solution I, keep the solution I stirring continuously, ...

Embodiment 3

[0050] A worm-like mesoporous Al 2 o 3 / Molecular sieve composite material, its preparation method comprises the steps:

[0051] 1) Synthesis of microporous nano-molecular sieves: 11.4g TPAOH (40wt%) solution, 5.9g white carbon black (that is, 5.9g nanometer SiO 2 Particles) were added to 50g of deionized water, stirred for 5 hours, and mixed uniformly to obtain a clear solution. The resulting solution was poured into a reaction kettle, heated to 100°C for 24 hours to crystallize, and the crystallized product was washed and dried. Place it in a muffle furnace at 550°C for 6 hours to obtain microporous nanomolecular sieves;

[0052] 2) Add 0.2 g of the obtained microporous nano-molecular sieve to 100 mL of ethanol, and sonicate for 5 hours to obtain a monodisperse uniform mixed solution I;

[0053] 3) Add 1.5g of aluminum sec-butoxide to 80mL of ethanol, stir for 3 minutes to mix thoroughly, and obtain the mixed solution II;

[0054] 4) Slowly add the obtained mixed solutio...

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Abstract

The invention provides a method for preparing a wormlike mesoporous Al2O3 / molecular sieve composite material. The whole method generally comprises the following two steps: 1) preparing a nano-grade molecular sieve; 2) performing in-situ compounding of the molecular sieve with a mesoporous aluminum oxide material. By adjusting hydrolysis of an aluminum source, the aluminum source is slowly hydrolyzed to form the wormlike mesoporous aluminum oxide material which is very well compounded with a molecular sieve, and at the same time a multi-stage porous system of a structure of mesopores (provided by aluminum oxide) and micropores (provided by the molecular sieve) as well is formed. The method provided by the invention is simple and feasible, easy in condition regulation and control and easy in large-scale production and has the potential of being applied to industrial fields such as molecule adsorption and catalysis.

Description

technical field [0001] The invention belongs to the technical field of inorganic synthesis, in particular to a worm-like mesoporous Al 2 o 3 Molecular sieve composite material and preparation method thereof. Background technique [0002] Zeolite molecular sieves belong to a class of solid catalysts with crystalline state. They are widely used in catalysis, adsorption separation, ion exchange and other fields. They are an indispensable class of solid catalyst materials in the fields of petrochemical and fine chemistry. At the same time, since the material usually has only a single micropore channel, when it is used as a catalyst, it is easy to cause problems such as too long reaction transmission path, restricted transport of reactant molecules or product molecules, etc., resulting in low conversion rate and carbon deposition on the catalyst. Cause a series of phenomena such as catalyst deactivation and poisoning. [0003] In order to solve the above problems, it is a simp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/70B01J35/10B01J20/16B01J20/30
CPCB01J20/08B01J20/16B01J29/70B01J35/1014B01J35/1019B01J35/1042B01J35/1057B01J35/1061B01J2229/18
Inventor 陈丽华彭钊汪建南孙明慧刘豪苏宝连
Owner WUHAN UNIV OF TECH
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