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Process for preparing mesopored alumina

A technology of alumina and preparation steps, applied in the direction of alumina/hydroxide, etc., can solve the problems of complicated operation process, limited industrialization, toxicity, etc., and achieve the effect of low raw material, convenient control and simple process

Active Publication Date: 2006-07-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present this method mainly takes poisonous, flammable, expensive aluminum alkoxide as precursor, carries out in alcoholic phase, and preparation period is long, operation process is complicated, has limited the industrialization of preparation (Chem.Commun., 1998, 1185; Microp. Mesop. Mater., 2002, 52, 169; Microp. Mesop. Mater., 2001, 44, 203)
In addition, most of the reported mesoporous aluminas have an amorphous framework, do not have the special crystal phase and surface properties of transition state aluminas, and are very sensitive to water, which will disappear after several months at room temperature. Loss of mesoporous structure (Chem.Mater., 1996, 8, 1451)
These make the application of amorphous mesoporous alumina as adsorbent, catalyst and catalyst support greatly limited.

Method used

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  • Process for preparing mesopored alumina

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Example 1 Prepare boehmite sol with commercial boehmite powder.

[0023] Get 13.67g boehmite powder (Al 2 o 3 The mass content is 74.6%) was dispersed in 200ml of water, 14ml of 1M nitric acid was added at 80°C, and the temperature was maintained to continue stirring for 6 hours to obtain a stable and highly dispersed 1M boehmite sol.

example 2

[0024] Example 2 Preparation of mesoporous alumina under alkaline conditions with surfactant as template.

[0025] At 30°C, add 3.64g of cetyltrimethylammonium bromide (CTAB), 3.6g of urea (or 60ml of 2M ammonia water) into 40ml of 1M boehmite sol, and continue stirring for 12 hours after completely dissolving. Transferred to 100°C for hydrothermal treatment for 24 hours, the pH of the mixture after leaving the kettle was 9.0, separated, washed, dried at 30°C, and then calcined at 500°C for 3 hours. XRD analysis proves that the skeleton of the product is composed of γ-Al 2 o 3 Composition (see attached figure 1 ). Other preparation conditions using polyethylene oxide-polypropylene oxide-polyethylene oxide (P123) and Tween-80 as templates and the main physicochemical properties of the products are shown in Table 1.

[0026]

example 3

[0027] Example 3 Directly prepare mesoporous alumina with surfactant as template.

[0028] At 35°C, 5.80g of P123 was dissolved in 20ml of 1M boehmite sol, and after continuous stirring for 12 hours, it was directly dried in a vacuum oven at 75°C and calcined at 500°C for 3 hours. XRD analysis proves that the skeleton of the product is composed of γ-Al 2 o 3 Composition (see attached picture). Other preparation conditions using CTAB, bis(2-ethylhexyl)sodium sulfosuccinate (AOT), and Tween-80 as templates and the main physicochemical properties of the products are shown in Table 2.

[0029]

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Abstract

The invention relates to a preparation method for alumina. Wherein, with aluminum sol as precursor, adding surfactant and high polymer or hydroxyl acid as structure guide agent, adding base to regulate system pH value within 8-11; hydrothermal composing at 80-100Deg, separating, clearing with water, drying, and baking at 500Deg; or drying directly the mixture at 30-100Deg, then baking at 500Deg to obtain the product. The experiments show: the product has connected worm-shaped pore structure with wall frame formed by crystal phase gamma-Al2O3 as well as high specific surface area and controllable pore size distribution, is simple and low cost and stable, and spreads its larger-scale application.

Description

technical field [0001] The present invention relates to the preparation of mesoporous alumina, specifically a high specific surface area, large pore volume, centralized and controllable pore size distribution, and a skeleton composed of crystalline phase γ-Al 2 o 3 Composition of mesoporous alumina. Background technique [0002] Alumina has various excellent physical and chemical properties, and is widely used in many fields such as industrial catalysis, adsorption, ion exchange, etc. When used as a catalyst carrier, the carbon deposits generated during the reaction will gradually block the pores of alumina, thereby inhibiting the mass transfer of reactants and products, and eventually leading to catalyst deactivation. It is known that for the support, the greater the contribution of micropores to the specific surface area and the wider the pore size distribution, the faster the deactivation rate of the catalyst. It can be seen that the pore structure of alumina has an im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02
Inventor 刘茜张涛王晓东程瑞华李宁徐长海
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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