Synthesis Of Mesoporous Alumina Assisted By Organic Saccharide Templates

Alumina is one of the most commonly used industrial raw materials. Because of its good mechanical strength, high thermostability and chemical stability, suitable isoelectric point, adjustable surface acidity/basicity and polycrystalline property, alumina has become the most widely used catalyst or catalyst support in petrochemical industry and these years mesoporous alumina is attracting more and more researchers from adsorption and catalysis fields. Therefore we put emphasis on the synthesis of mesoporous with high specific surface area, large pore volume and controllable narrow pore size distribution.Organic saccharides template route has shown its great potential in synthesizing mesoporous alumina. However, it is very difficult for researchers to prepare mesoporous alumina via making systematic use of saccharides because of various kinds of saccharides with various properties which lead to various synthesis routes. Aiming at different organic template, this paper used corresponding inorganic aluminum source as the template's partner and designed feasible synthesis route to realize the synthesis of mesoporous alumina according to each template's property and its interaction way with aluminium source. Meanwhile, through various characterization techniques including TGA/DTA, XRD, Nitrogen physical adsorption, TEM and SEM measurements, 3 mechanisms about the interaction between each saccharide and aluminum source were proposed which were H-bond assembly, coordination crosslinking and colloidal particles coagulation respectively so that suitable synthesis route could be suggested in synthesizing mesoporous alumina prepared with other similar saccharide template by means of these 3 mechanisms.Moreover, it was found that the pore size of the mesoporous alumina could be controlled over a range of pore diameters from 4.0nm~6.3nm. On one hand, the pore structure of the final product could be controlled by tuning the molar ratio of saccharide template to aluminum source. On the other hand, the adjustable range of pore size was further enlarged by selecting different kinds of saccharide as template.