Preparation method of micron gamma aluminum oxide with controllable morphology and mesoporous structure

A γ-alumina, mesoporous structure technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of many influencing factors, difficult to effectively control the morphology, structure and performance of alumina, and achieve simple preparation process operation. , safety cost, the effect of high specific surface area

Inactive Publication Date: 2013-10-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently the most common mesoporous γ-Al 2 o 3 The preparation method is the template method, using polyoxyethylene, P123, glucose and other templates. Although this method is widely applicable, there are many influencing factors, and it is difficult to effectively control the morphology, structure and performance of alumina.

Method used

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  • Preparation method of micron gamma aluminum oxide with controllable morphology and mesoporous structure
  • Preparation method of micron gamma aluminum oxide with controllable morphology and mesoporous structure
  • Preparation method of micron gamma aluminum oxide with controllable morphology and mesoporous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take 0.35g of polyethylene glycol, 3.4g of aluminum trichloride hexahydrate, 2.52g of urea and 70mL of deionized water and magnetically stir and dissolve until uniform. The stirring speed is 200rpm and the time is 1.5 hours to obtain a mixed solution, which is the mother liquor. Then the mixed solution was transferred to a polytetrafluoroethylene liner and sealed in a hydrothermal kettle, and the hydrothermal kettle was subjected to microwave hydrothermal reaction at 80° C. for 6 hours. After natural cooling, a mixed solution of white precipitate and mother liquor was obtained, and then passed Centrifuge solid-liquid separation at a centrifugation speed of 4000 rpm for 3 minutes. Then wash with water and absolute ethanol 4 times each, wash the white precipitate, and dry it in an oven at 60°C for 12 hours to obtain the γ-alumina precursor, and finally the γ-alumina precursor is heated from room temperature to 10°C / min. 800°C, and at the same time keep at 800°C for 2 hour...

Embodiment 2

[0027] Take 5g of polyethylene glycol, 19.3g of aluminum trichloride hexahydrate, 50g of urea and 80mL of deionized water and magnetically stir and dissolve until uniform. The stirring speed is 300rpm and the time is 2 hours to obtain a mixed solution, which is the mother liquor. Then the mixed solution is transferred to a polytetrafluoroethylene liner and sealed in a hydrothermal kettle, and the hydrothermal kettle is subjected to a microwave hydrothermal reaction at 100° C. for 10 hours. After natural cooling, a mixed solution of white precipitate and mother liquor is obtained, and then passed Centrifuge solid-liquid separation at a centrifugation speed of 4000 rpm for 3 minutes. Then wash with water and absolute ethanol 5 times each, wash the white precipitate, and dry it in an oven at 80°C for 12 hours to obtain the γ-alumina precursor, and finally the γ-alumina precursor is heated from room temperature to 10°C / min. 820°C, at the same time, keep it at 820°C for 4 hours and...

Embodiment 3

[0029] Take 4.4g of ammonium citrate, 10.5g of aluminum chloride hexahydrate, 55g of urea and 90mL of deionized water and magnetically stir and dissolve until uniform. The stirring speed is 400rpm and the time is 2.5 hours to obtain a mixed solution, that is, the mother liquor. Then the mixed solution is transferred to the polytetrafluoroethylene liner and sealed in the hydrothermal kettle, and the hydrothermal kettle was subjected to microwave hydrothermal reaction at 120° C. for 15 hours. After natural cooling, the mixed solution of white precipitate and mother liquor was obtained, and then Solid-liquid separation by centrifugation at a centrifugation speed of 4000 rpm for 3 minutes. Then wash with water and absolute ethanol 6 times each, wash the white precipitate, and dry it in an oven at 80°C for 12 hours to obtain a γ-alumina precursor. Finally, the γ-alumina precursor is heated from room temperature to 15°C / min. 840°C, and at the same time keep at 840°C for 6 hours and ...

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Abstract

The invention discloses a preparation method of micron gamma aluminum oxide with controllable morphology and a mesoporous structure. The method comprises the following steps of: uniformly stirring and mixing an aluminum source material, a dispersing agent, a precipitating agent, and deionized water at room temperature to obtain a mixed solution; sealing the obtained mixed solution, carrying out a hydrothermal reaction at 80-180 DEG C for 6-48 hours to obtain a mixed solution of white precipitate and a mother solution, centrifugally separating the white precipitate from the mother solution, washing the white precipitate, and drying the washed precipitate in a drying oven to obtain a dispersing agent compound gamma aluminum oxide precursor; and calcining the gamma aluminum oxide precursor to obtain one or more of zero-dimensional / one-dimensional / three-dimensional micron gamma aluminum oxide with the mesoporous structure. According to the micron gamma aluminum oxide with the controllable morphology and the mesoporous structure disclosed by the invention, the mesoporous structure enables the aluminum oxide to be widely applied to the fields of catalysis and adsorption. Simultaneously, the preparation method of the micron gamma aluminum oxide with the controllable morphology and the mesoporous structure disclosed by the invention is simple in process, safe to operate, and low in cost.

Description

technical field [0001] The invention relates to gamma alumina, in particular to a preparation method of micron gamma alumina with controllable appearance and mesoporous structure; the micron gamma alumina has zero-dimensional, one-dimensional and three-dimensional structures with mesoporous structure. technical background [0002] Activated alumina with mesoporous structure is one of the most important catalyst supports and adsorbents, and is widely used in the fields of petroleum processing catalysts and sewage treatment. There are eight crystalline states of alumina known so far, among which γ-Al 2 o 3 It has high pore volume, specific surface area and thermal stability, so it is widely used. One of the important properties of catalyst supports and adsorbents is their mesoporous structure characteristics and specific surface area. The requirements for the catalyst carrier and adsorbent are firstly to provide the largest possible reaction contact area to improve the disp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 饶平根李艳辉
Owner SOUTH CHINA UNIV OF TECH
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