Method for preparing spherical porous alumina carrier

A technology of porous alumina and aluminum hydroxide, applied in the direction of catalyst carrier, chemical instrument and method, alumina/aluminum hydroxide, etc. Equilibrium problem, to achieve the effect of strengthened bonding, good pore structure and uniform particle size

Active Publication Date: 2012-09-12
中铝郑州有色金属研究院有限公司
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Problems solved by technology

Since the structure of polyethylene glycol micelles no longer exists in the form of microscopic micelles under the condition of heating in a water bath, the characteristics of the mesoporous structure are also not obvious.
In the end, due to the uneven particle size and small pore volume of the synthesized alumina, it basically cannot meet the necessary catalyst production requirements.

Method used

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  • Method for preparing spherical porous alumina carrier
  • Method for preparing spherical porous alumina carrier
  • Method for preparing spherical porous alumina carrier

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preparation example Construction

[0026] A method for preparing a spherical porous alumina carrier, the steps of the preparation process comprising:

[0027] (1) Dissolve aluminum hydroxide with hydrochloric acid or sulfuric acid solution to make an acidic aqueous solution of aluminum ions;

[0028] (2) Introduce the prepared acid solution into NaOH solution drop by drop under the hydrothermal system, stir vigorously, control the final pH value of the system to be stable between 3.0 and 5.0, and then perform aging treatment at room temperature;

[0029] (3) Vigorously stir the aged solution under the hydrothermal system, quickly add the templating agent solution, and then introduce the reaction aid; continue to fully stir the above mixed system under the hydrothermal condition;

[0030] (4) After fully washing and filtering with deionized water, spray-dry to obtain the precursor powder;

[0031] (5) The precursor powder is roasted to obtain spherical porous activated alumina.

Embodiment 1

[0033] First, fully dissolve 1g of sodium laurate in 20ml of deionized water to prepare solution C, then measure 50ml of solution B, and quickly add solution C under 80°C hydrothermal system. After stirring vigorously for 1 hour, 0.2 g of citric acid was introduced as a reaction aid. Continue to fully stir the above mixed system for 12 hours under hydrothermal conditions, then use deionized water to fully filter and use spray drying equipment to quickly obtain the precursor powder material, and finally roast the precursor powder at 700°C for 4 hours in an air atmosphere , the rate was controlled at 2°C / min during the heating period, and the spherical porous alumina carrier material was obtained by natural cooling

Embodiment 2

[0035] First fully dissolve 1.5g P123 in 20ml deionized water to prepare solution C, then measure 100ml of solution B, quickly add solution C under 60°C hydrothermal system, stir vigorously for 2 hours and introduce 0.5g lauric acid as a reaction aid . Continue to fully stir the above mixed system for 24 hours under hydrothermal conditions, and then use spray drying equipment to quickly obtain the precursor powder material after being fully filtered with deionized water, and finally roast the precursor powder at 700°C for 4 hours in an air atmosphere , and finally obtain a spherical porous activated alumina carrier, and the rate is controlled at 2°C / min during the heating period.

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Abstract

A method for preparing a spherical porous alumina carrier is characterized in that the preparing steps include dissolving aluminium hydroxide by a hydrochloric acid or sulfuric acid solution to obtain an aluminum ion acid aqueous solution; dropwise introducing a sodium hydroxide solution into the obtained acid aqueous solution in a hydrothermal system, performing a punchy stirring, finally stabilizing the potential of hydrogen (pH) value in a range between 3.0 and 5.0, and then performing an ageing treatment at the normal temperature; vigorously stirring a solution after ageing in the hydrothermal system, rapidly adding a template agent solution, and then introducing a reaction auxiliary; continuously stirring and reacting the above mixed system completely in the hydrothermal system; obtaining a precursor powder by a spray drying after fully washing and filtering with deionized water; and calcining the precursor powder to obtain spherical porous activated aluminium oxide. By means of the method, the prepared spherical porous alumina carrier is good in pore passage structure, large in pore volume and specific surface area and capable of meeting industrial application requirements of a heterogeneous catalysis, a tail gas purification and an adsorption separation.

Description

technical field [0001] The invention discloses a method for preparing a spherical porous alumina carrier, and relates to a method for preparing a spherical porous alumina carrier for a catalyst. Background technique [0002] Alumina is currently the most widely used catalyst carrier in the field of industrial production. Compared with zeolite molecular sieves and silicon-based M41S mesoporous materials, it has higher hydrolytic stability, more surface isoelectric points, acid sites and defects, so it is more It is suitable as a catalyst carrier to load different metal oxides or noble metals as catalysts. The alumina prepared by the traditional precipitation method has small specific surface area, small pore volume, and too wide pore size distribution, which limits its promotion and application in specific fields. In production, the specific surface area of ​​alumina particles is often increased by micro-nano transformation, and the pore volume and pore size distribution in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B01J32/00B01J35/10B01J21/04
Inventor 刘明珠王建立姚长江李东红姜雪琴宋为聪耿红娟
Owner 中铝郑州有色金属研究院有限公司
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