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Method for synthesizing tungsten-modified alumina mesoporous material through solvent-evaporation induced self-assembly and catalysis application thereof

A mesoporous material and self-assembly technology, which is applied in the field of mesoporous material modification and alumina mesoporous materials, can solve the problems of easy falling off, surface agglomeration of mesoporous materials, and large mass transfer resistance.

Inactive Publication Date: 2016-12-07
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

WO prepared without structure directing agent 3 / Al 2 o 3 Composite materials have problems such as small specific surface area, uneven pore size distribution, and large mass transfer resistance during the reaction process; WO prepared by post-impregnation method 3 / Al 2 o 3 Composite material exists WO 3 Easy to fall off, WO 3 Easy to agglomerate on the surface of mesoporous materials

Method used

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  • Method for synthesizing tungsten-modified alumina mesoporous material through solvent-evaporation induced self-assembly and catalysis application thereof
  • Method for synthesizing tungsten-modified alumina mesoporous material through solvent-evaporation induced self-assembly and catalysis application thereof
  • Method for synthesizing tungsten-modified alumina mesoporous material through solvent-evaporation induced self-assembly and catalysis application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve 1g of F127 in 10mL of absolute ethanol and 0.5mL of concentrated nitric acid, and stir until clear; dissolve 2.04g of aluminum isopropoxide in 10mL of absolute ethanol and 1mL of concentrated nitric acid, and stir until clear; press 1 of the above two solutions :1 mix, continue to stir until uniform; add silicotungstic acid (0.05mmol) ethanol solution dropwise according to the volume ratio of 3:40, continue to stir for 4h; transfer the solution into a petri dish and place 60 In the oven for 72h, and the gel obtained at 600 Low roasting for 4h, heating rate is 0.5 / min. The obtained mesoporous material is denoted as WO 3 (0.06) / Al 2 O 3 , Wherein the theoretical molar ratio of tungsten to aluminum is 0.06.

[0025] The tungsten-modified WO prepared in Example 1 was modified by using the Tristar 3000 automatic physical adsorption and desorption instrument from Micromeritics Company 3 / Al 2 O 3 The specific surface area, pore size distribution, pore volume and othe...

Embodiment 2

[0030] WO 3 (0.12) / Al 2 O 3 The preparation method is the same as in Example 1, changing the amount of silicotungstic acid in the silicotungstic acid ethanol solution to 0.1 mmol. The resulting solution is placed at 60 In the oven for 72 hours, the dried gel is at 600 Low roasting for 4h, heating rate is 0.5 / min. The obtained mesoporous materials are respectively denoted as WO 3 (0.12) / Al 2 O 3 , Wherein the theoretical molar ratio of tungsten to aluminum is 0.12.

Embodiment 3

[0032] WO 3 (0.24) / Al 2 O 3 The preparation method is the same as in Example 1, changing the amount of silicotungstic acid in the silicotungstic acid ethanol solution to 0.2 mmol. The resulting solution is placed at 60 In the oven for 72 hours, the dried gel is at 600 Low roasting for 4h, heating rate is 0.5 / min. The obtained mesoporous materials are respectively denoted as WO 3 (0.24) / Al 2 O 3 , Wherein the theoretical molar ratio of tungsten to aluminum is 0.24.

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Abstract

The invention relates to a method for synthesizing a tungsten-modified alumina mesoporous material through solvent-evaporation induced self-assembly and a catalysis application thereof. The invention provides a tungste-modified WO3 / Al2O3 mesoporous material through solvent-evaporation induced self-assembly with a one-step method, the prepared tungste-modified WO3 / Al2O3 mesoporous material catalyst has ordered and uniformly distributed tunnel structures, the specific surface is 140-200 m<2> / g, the pore diameter is 8.6 nm-9.4 nm, the hydro-thermal stability is good, and the mesoporous material has acidity and bond breaking function. The mesoporous material can be used for preparing glycol by cellulose hydrogenolysis and conversion. The preparation method requires only one step, the process is simple, the prepared catalyst has high specific surface area of mesoporous alumina and bond breaking function of tungsten oxide, and the catalytic activity for conversing cellulose to glycol with one step is enhanced.

Description

Technical field [0001] The invention relates to a solvent-induced volatilization self-assembly method for synthesizing tungsten-modified alumina mesoporous material and its catalytic application, which belong to mesoporous material modification technology. Background technique [0002] Mesoporous alumina is a kind of porous solid material. With its good hydrothermal stability, adsorption performance and surface acidity, it is widely used as adsorbent, catalyst active component and catalyst carrier and has attracted much attention. It has always been a material science And one of the research hotspots in the fields of catalysis Especially in the application of catalyst support, because of its high specific surface area and adjustable pore size (2-50nm), mesoporous alumina can not only improve the surface dispersion of catalytically active components, but also increase the loading of active components. The amount will not cause blockage of the pores, which is more conducive to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30C07C29/00C07C31/20
CPCY02P20/52B01J23/30B01J21/04C07C29/00C07C31/202
Inventor 王华常翠荣祝新利刘晓韩金玉
Owner TIANJIN UNIV
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