氧化铝载体改性及其应用研究进展

Alumina,which is not only inexpensive and easy to obtain, but also has many advantages such as porosity, large specific surface area, high dispersibility and high thermal stability. Therefore, alumina is often used as catalyst carrier and widely used in the catalysis of petroleum industry.The pore structure of alumina has a great influence on the catalytic reaction of the catalyst, especially in mass transfer.In order to optimize the performance of alumina carrier, a lot of studies have been carried out on the pore expansion of alumina and the modification of alumina by adding additives.Pore enlargement can not only reduce the material diffusion resistance and improve mass transfer, but also improve the effective utilization of active sites and enhance the anti-coking performance. Thus, the yield of hydrogenation catalysis can be increased. The high temperature sintering and phase transformation of alumina support can be effectively inhibited by the addition of catalyst support modified by additives. In this way, the pore structure can be prevented from being destroyed and the service life of the catalyst can be prolonged.In this work, the methods for preparing alumina were pseudo boehmite dehydration and sol-gel method. Pore expanding methods of alumina, including self-assembly method, hydrothermal treatment method and pore expanding agent method, were reviewed. The modification methods of alumina additives were described, including rare earth metal oxides, alkali (earth) metal oxides, other metal oxides and non-metal oxides. The latest research progress of modified alumina carriers was summarized.Finally an outlook for the future research and development of aluminaas catalyst support was given.The existing modification methods of alumina still cannot meet the market demand. The preparation of alumina carriers for specific reactions is still the main research content at present. Four key aspects of future research on alumina carriers were proposed.