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Mesoporous alumina preparation method based on cross-linking reaction

A technology of mesoporous alumina and cross-linking reaction, which is applied in the field of preparation of alumina technology, can solve problems such as high environmental pressure, and achieve the effect of easy control and simple process

Active Publication Date: 2010-09-01
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses aluminum nitrate as a raw material, which reduces the cost, but the reaction is based on the ring-opening reaction of propylene oxide, so it must be carried out under the conditions of ethanol medium and propylene oxide, which belongs to a non-aqueous system. This preparation method greater pressure on the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 3 grams of sodium carboxymethylcellulose 1000, dissolve in 100 grams of pure water, fully dissolve, add 2 grams of 25wt.% ammonia water while stirring, then add 30 grams of 10wt.% aluminum nitrate solution drop by drop while stirring , to obtain a composite sol. The composite sol was left to stand for 24 hours to obtain a gel, which was further aged for 24 hours, and dried at a constant temperature in an 80-degree drying box for 8 hours to reach a constant weight. The obtained dry gel was pulverized and heated in a muffle furnace to 650 degrees, calcined for 8 hours to prepare white mesoporous alumina. The pore structure was tested by a physical adsorption instrument, and the BET specific surface area was 145.9 square meters per gram, the pore volume was 0.349 cm3 / g, and the average pore diameter was 7.63 nanometers.

Embodiment 2

[0019] Weigh 5 grams of sodium carboxymethylcellulose 125, dissolve in 100 grams of pure water, fully dissolve, add 15 grams of 28wt.% ammonia water while stirring, then add 75 grams of 20wt.% aluminum nitrate solution drop by drop while stirring , to obtain a composite sol. The composite sol was left to stand for 24 hours to obtain a gel, which was further aged for 24 hours, and dried at a constant temperature in an 80-degree drying box for 8 hours to reach a constant weight. The obtained dry gel was pulverized and heated in a muffle furnace to 650 degrees, calcined for 8 hours to prepare white mesoporous alumina. The pore structure was tested by a physical adsorption instrument, and the BET specific surface area was 159.7 square meters per gram, the pore volume was 0.347 cm3 / g, and the average pore diameter was 7.21 nanometers.

Embodiment 3

[0021] Weigh 3 grams of sodium carboxymethylcellulose 1700, dissolve in 300 grams of pure water, fully dissolve, and add 6.25 grams of 16wt.% aluminum nitrate solution dropwise while stirring to obtain a composite sol. The composite sol was left to stand for 24 hours to obtain a gel, which was further aged for 24 hours, and dried at a constant temperature in an 80-degree drying box for 8 hours to reach a constant weight. The obtained dry gel was pulverized and heated in a muffle furnace to 650 degrees, calcined for 8 hours to prepare white mesoporous alumina. The pore structure was tested by a physical adsorption instrument, and the BET specific surface area was 171.3 square meters per gram, the pore volume was 0.348 cm3 / g, and the average pore diameter was 6.99 nanometers.

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Abstract

The invention discloses a mesoporous alumina preparation method based on cross-linking reaction in the field of porous support technology. The preparation method comprises the steps of: weighting polyose electrolyte and dissolving in pure water to prepare a polyose electrolyte solution; adding an aluminum nitrate solution or mixed liquid of the aluminum nitrate solution and ammonia water and stirring uniformly to obtain compound sol; standing for 24h to obtain gel; aging for 24 hours and then carrying out constant-temperature drying treatment at 80 DEG C; crushing and then calcining for 8 hours at 650 DEG C to prepare white mesoporous alumina. The invention realizes the synthesis of the mesoporous alumina in a water phase system by taking cheap and environmental-protection saccharides which can be post-processed easily as a structural guide agent and using thin diaspore sol which is cheap and easily prepared as an aluminum precusor.

Description

technical field [0001] The invention relates to a preparation method in the technical field of alumina, in particular to a preparation method of mesoporous alumina based on a crosslinking reaction. Background technique [0002] Alumina is a very important industrial raw material. It is widely used in the field of catalysis. It is often used as catalyst and catalyst carrier in petroleum refining, automobile exhaust emission and other occasions. Mesoporous alumina has great application potential in many fields such as industrial catalysis and adsorption due to its high specific surface area, concentrated pore size distribution, and adjustable pore size. [0003] At present, the synthesis methods of mesoporous alumina are mainly divided into soft template method and hard template method. The hard template method refers to using a solid with a mesoporous structure (silicon dioxide, carbon, etc.) as a "hard template", introducing an aluminum source precursor into the pores of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B82B3/00
Inventor 赵斌元石悠邓国民赖亦坚唐建国胡晓斌
Owner SHANGHAI JIAO TONG UNIV
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