There are various ways to modify the pore structure of activated alumina, such as changing the preparation process conditions, preparation methods, and adding regulators. There are various ways to modify the pore structure of activated alumina, such as changing the preparation conditions, preparation methods, and adding regulators. Since activated alumina (γ-Al 2 O 3 ) is generally prepared by heat-dehydration conversion of its precursor pseudo-boehmite, the modified activated alumina can be obtained by changing the process conditions for preparing the activated alumina precursor pseudo-boehmite. The purpose of the pore structure. The relationship between the preparation conditions of the pseudo-boehmite and the pore structure The preparation process of the pseudo-boehmite has a great influence on the pore structure of the product. The preparation mainly includes the steps of gel formation (or precipitation), aging and drying. The pore structure can be effectively adjusted by changing the pH and the gelation temperature during the preparation process. The experimental results show that the pore size distribution of alumina synthesized under acidic conditions (pH=1) is concentrated (3~6nm), while the activated alumina synthesized under alkaline conditions does not have a concentrated pore size. As the precipitation temperature increases, both the specific surface area and the pore volume increase, and the pore size distribution is also more concentrated. The specific surface area of ​​γ-Al2O3 prepared at a precipitation temperature of 80 °C is 290 m2/g, the pore volume is 0.61 mL/g, and the proportion of pores in the range of 2 to 5 nm is 89%. Increasing the aging temperature and increasing the aging time all contribute to the improvement of the crystallinity of the product. The pseudo-boehmite grains also grow with the growth, which in turn affects the pore structure of the activated alumina. Although the pore structure of the precursor pseudo-boehmite can be modulated by changing the process conditions for preparing the pseudo-boehmite, the adjustment range is small, and other physical and chemical properties of the pseudo-boehmite should be noted. The resulting changes, such as crystallinity and peptization rate, affect the properties of the activated alumina of the final product.
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