Method for preparing mesoporous gamma-Al2O3 by dynamic hydrothermal method

Abstract

The invention relates to a method for preparing mesoporous gamma-Al2O3 by a dynamic hydrothermal method, belonging to the field of preparation of inorganic porous materials. The invention aims to solve the problems that in the prior art, reaction steps are multiple, experimental conditions are difficult to control, products are incompletely crystallized, the reaction time is too long, and a static reaction does not facilitate full contact among reaction materials. The method comprises the following steps of: adding inorganic aluminum salt and a precipitating agent into surfactant solution respectively, and uniformly mixing the inorganic aluminum salt with the precipitating agent; continuously stirring the mixed solution, and performing hydrothermal treatment; and washing and calcinating obtained products after finishing the reaction, and thus obtaining the mesoporous gamma-Al2O3. The method has the advantages that: the reaction is performed more fully, the formation of alumina precursors can be simply controlled, the formation of mesoporous alumina can be effectively controlled, the crystallization time is shortened to be less than 24 hours, the preparation period is short, and the method is suitable for large-scale continuous production.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic porous materials, and in particular relates to the preparation of mesoporous γ-Al by a dynamic hydrothermal method 2 o 3 Methods. Background technique [0002] The large specific surface area and regular pore structure of inorganic mesoporous materials make them have high activity and large adsorption capacity. Mesoporous γ-Al 2 o 3 It is one of the important materials. Due to mesoporous γ-Al 2 o 3 It has the advantages of large specific surface area, uniform pore size and stable physical and chemical properties, so it is widely used as a binder in the field of catalyst carriers. [0003] At present, the methods for synthesizing mesoporous alumina are divided into the following types: precipitation method, sol-gel method and crystallization method. [0004] The precipitation method is to add a precipitating agent to the aqueous solution of aluminum-containing metal salts to form cry...

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Problems solved by technology

However, the sol-gel method is not effective in the synthesis of mesoporous γ-Al 2 o 3 There are also deficiencies in the field, for example, when the template is removed, the calcination temperature is too high, the time is too long, the crystallization of the product is not perfect, and the particles are prone to self-agglomeration, etc.

[0006] The crystallization method is a method for preparing high-quality (higher crystallinity and larger specific surface area) crystals, but it belongs to a static preparation method like the above two methods, and this preparation method is not conducive to the reaction between substances. Fully contact and react between them, and the reaction time of the general crystallization method is too long, generally takes 24 to 72 hours

Moreover, the static preparation method is not suitable for large-scale continuous production

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