Preparation, characterization and catalytic properties of chromiaaluminia xerogels synthetized by a “Sol-Gel” process
Written by sctunisie no commentsChromia-Aluminia mixed oxides are prepared by the "sol-gel" method. This method involves the hydrolysis and polycondensation of an homogeneous mixture of metallic alkoxides. The gelification occurs in acetic medium by varying the molar ratio k = [acetic acid] / [alkoxide] between 0.5 and 3. The structural and catalytic properties of the xerogels obtained by calcination up to 440°C depend on the molar k, the quantity of chromium and the temperature of calcination. Very selective catalysts in partial oxidation and ammoxidation of paraxylene are obtained by acting on these parameters.
S. Sam-Rezgui, A. Ghorbel
Pages 299-309
