Study On Synthesis And Application Of Mesoporous Alumina Prepared By Inorganic Aluminum Salts

Synthesis of organized mesoporous alumina by inorganic aluminum salts and the application as sorbent in the adsorption of Cr³⁺ have been studied in detail. Organized mesoporous alumina was prepared by aluminum nitrate. The structure was characterized by several measuring technology. The influence of reaction conditions on structure of organized mesoporous alumina has been investigated. Using the organized mesoporous alumina as sorbent, the adsorption abilities of Cr³⁺ in different conditions were studied. Cu-containing catalyst on synthesized mesoporous alumina has been prepared by different method. Several techniques weres used to detect the structural characterization of catalyst. The performance of Cu-containing catalyst using in the H₂O₂ catalytic oxidation has been tested.Organized mesoporous alumina was synthesized by precipitation of aluminum nitrate. PEG 1540 was used as template, monoamonium phosphate and carbamide as assistant solvent. Specific surface area reaches 220-300m²/g. Total pore volume is 0.3-0.5cm³/g, pore diameter up to 2.8-5nm. The method overcomes the shortcut of expensive template and alumina source in the synthesis of mesoporous alumina for its simple technology and inexpensive cost. PEG1540 can make the direct-piling and support function in the formation of mesopore. The pH value of reaction terminal and the change of cleaning produce important influence on mesoporous structure.Using the organized mesoporous alumina as sorbent, the adsorption ability of Cr³⁺ was studied. The value of pH, the concentration of Cr³⁺ and the temperature can affect the adsorption performance. The perfect adsorption condition were given and the adsorbed process could be described by Freundlich equation.Cu-containing catalysts were synthesis by overloading impregnation, equivalent-volume impregnation method and in-suit method. The catalytic performance was studied through the application in H₂O₂ catalytic oxidation. The different impregnation method has important influence on the structure, interaction between metal and carrier, catalysis of Cu-containing catalyst supported on mesoporous alumina.