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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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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 present invention provides a worm-like mesoporous Al 2 O 3 / Preparation method of molecular sieve composite materials, the entire invention is roughly divided into two steps: 1) preparation of nanoscale molecular sieves; 2) in-situ composite of molecular sieves and mesoporous alumina materials. By adjusting the hydrolysis of the aluminum source, the invention enables the aluminum source to slowly hydrolyze to form a worm-like mesoporous alumina material, which is well compounded with the molecular sieve to form a material with both mesopores (provided by alumina) and micropores (provided by molecular sieve). Structural hierarchical pore system. The preparation method involved in the present invention is simple and feasible, the conditions are easy to control, and it is easy to produce in large quantities. It is expected to be applied in industrial fields such as molecular 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
CPCB01J20/08B01J20/16B01J29/70B01J2229/18B01J35/613B01J35/635B01J35/643B01J35/647B01J35/615
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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