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A kind of preparation method of gamma-alumina

A technology of alumina and inorganic aluminum salts, which is applied in the direction of alumina/aluminum hydroxide, can solve problems that need to be further developed, and achieve the effects of product stability, low reaction temperature, and high specific surface area

Active Publication Date: 2015-11-18
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many preparation methods of γ-alumina have been proposed, the simple and effective method for obtaining γ-alumina with high specific surface area needs to be further developed.

Method used

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  • A kind of preparation method of gamma-alumina
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  • A kind of preparation method of gamma-alumina

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Drugs: sodium metaaluminate (Sinopharm Chemical Reagent Co., Ltd., AR, purity ≥ 41.0%), absolute ethanol (Sinopharm Chemical Reagent Co., Ltd., AR), carbon dioxide (Xiamen Linde Gas Co., Ltd., purity ≥ 99.99%) .

[0025] The first step: prepare ethanol aqueous solution, the ratio of alcohol to water is 1:1 (volume ratio), accurately weigh 1.02g of sodium metaaluminate and place it in a 50ml volumetric flask, add an appropriate amount of ethanol aqueous solution, and prepare 0.25M metaaluminate sodium ethanol in water. Pour the solution into a 180ml reaction kettle, seal it, place it in a water bath, and heat the water bath to 60°C.

[0026] The second step: the CO 2 Pour into the reactor, preheat the CO at the inlet of the reactor 2 , through the pressure control valve to adjust the CO 2 The pressure is 8 MPa, and the temperature and pressure are maintained for 30 minutes to react to obtain hydrated alumina which is the precursor of γ-alumina.

[0027] The third st...

Embodiment 2

[0032] Drugs: sodium metaaluminate (Sinopharm Chemical Reagent Co., Ltd., AR, purity ≥ 41.0%), absolute ethanol (Sinopharm Chemical Reagent Co., Ltd., AR), carbon dioxide (Xiamen Linde Gas Co., Ltd., purity ≥ 99.99%) .

[0033] This example adopts the same process and equipment as in Example 1, except that the ratio of alcohol to water is 2:1.

[0034] The specific surface area, pore volume and pore diameter of γ-alumina obtained at 400°C are 405.3m 2 / g, 1.1cm 3 / g and 9.3nm. After calcination at 800°C for 2 hours, the specific surface area, pore volume and pore diameter of γ-alumina are 347.4m 2 / g, 0.73cm 3 / g and 13.5nm.

Embodiment 3

[0036] Drugs: sodium metaaluminate (Sinopharm Chemical Reagent Co., Ltd., AR, purity ≥ 41.0%), absolute ethanol (Sinopharm Chemical Reagent Co., Ltd., AR), carbon dioxide (Xiamen Linde Gas Co., Ltd., purity ≥ 99.99%) .

[0037] This example adopts the same process and equipment as in Example 1, except that the ratio of alcohol to water is 3:1.

[0038] The specific surface area, pore volume and pore diameter of the γ-alumina obtained at 400°C are 306.9m 2 / g, 0.95cm 3 / g and 15.7nm. After calcination at 800°C for 2 hours, the specific surface area, pore volume and pore diameter of γ-alumina are 181.3m 2 / g, 0.95cm 3 / g and 18.1nm.

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Abstract

The invention discloses a preparation method of gamma-aluminum oxide, relating to an amphoteric oxide. The invention provides a preparation method of gamma-aluminum oxide with a high specific surface area and a preferred hole structure, wherein the preparation method is simple in process, few in reaction step and suitable for large-scale industrial production. The preparation method comprises the following steps of: preparing an aqueous organic solvent solution with inorganic aluminum salt, adding the solution with the inorganic aluminum salt into a reaction kettle, and introducing carbon dioxide to react to obtain reaction slurry; reducing the pressure of the reaction kettle to the normal pressure, and sequentially collecting, washing and filtering the reaction slurry; and finally, removing water in the product through alcohol washing, drying to obtain bayerite (white powder), and roasting to obtain the gamma-aluminum oxide. The obtained gamma-aluminum oxide has the high specific surface area of 519.8m<2> / g, the pore volume of 1.1cm<3> / g, the pore diameter of 28.4nm and the thermal stabilized temperature of 800 DEG C.

Description

technical field [0001] The invention relates to an amphoteric oxide, in particular to a method for preparing gamma-alumina with high specific surface area and large pore diameter. Background technique [0002] γ-alumina is an amphoteric oxide with good surface properties. As a catalyst carrier, it is widely used in various fields, such as catalytic synthesis, petrochemical industry, oil refining, gas release control and wastewater treatment. For supported catalysts, high specific surface area, suitable pore size distribution and high thermal stability are beneficial to support more active metal components to prepare catalysts with better activity, selectivity and stability. [0003] γ-alumina is usually obtained by roasting and dehydrating precursor hydrated alumina (such as pseudoboehmite and bayerite). The preparation methods of precursor hydrated alumina mainly include precipitation method, sol-gel method, hydrothermal method, microemulsion method. Such as the methods d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02
Inventor 李军易卜拉辛·阿卜杜勒·拉夫洪燕珍苏玉忠王宏涛
Owner XIAMEN UNIV
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