چكيده به لاتين
Mesoporous γ-Al2O3 is the most extensively used catalysts support in a wide range of catalytic processes due to its unique physical, textural, thermal and chemical properties. In this dissertation, we report two different methods: 1) sol gel-oil drop and 2) biopolymer chitosan as a template, to synthesis and production of spherical Millimetric mesoporous γ-alumina granules. XRD, DTA, TGA, SEM, and N2 adsorption techniques are used to characterize the morphologies and structure of the prepared alumina granules. By using the sol gel–oil drop method and precursor of alkoxide (aluminum isopropoxide), spherical Millimetric mesoporous γ-alumina granules in the size of 1.5 to 2 mm with high specific surface area (306 m2/g), high pore volume (0.5 cm3/g) and pore diameter in the range of 2-10 nm were synthesized. Then, CCD (Central composite design) was used for Mathematical modeling and optimization of the sol gel–oil drop method. The results of the modeling led to the extraction of equations with high correlation coefficient for the specific surface area, pore volume and pore diameter as dependent variables, which indicates the high validity of the proposed model. Then we also report the synthesis of mesoporous γ-alumina granules using the biopolymer chitosan as a template. Spherical gamma alumina granules with high specific surface area (310 m2/g), high pore volume (0.73 cm3/g) and pore diameter in the range of 2-10 nm were synthesized. Also, in order to Mathematical modeling and screening the operational parameters, experimental design (Full factorial design) was used.
