New process to control hydrolysis step during sol-gel preparation of sulfated zirconia catalysts |
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Authors: | L B Hamouda A Ghorbel |
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Affiliation: | (1) Laboratoire de Catalyse et Chimie des Matériaux, Département de chimie, Faculté des Sciences, de Tunis, 2092, Tunisia |
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Abstract: | Sulfated zirconia catalysts were prepared by sol-gel process using a new method allowing the control of the hydrolysis step
of zirconium alkoxides. Prepared samples were characterized by N2 adsorption (desorption) at 77 K, XRD, chemical analysis of total sulfur and XPS. Catalytic properties have been evaluated
in n-butane and n-hexane isomerization reactions. Obtained results show that time necessary for gelation is significant and
depends considerably on the nature of the zirconium precursor. Concerning the properties of the solids obtained by this method,
it has been noted that the use of the zirconium propoxide led to a better retention of the sulfate species, which improves
activity during isomerization reactions. It has been found also that an initial S/Zr molar ratio equal to 0.5 allowed to obtain
an optimal sulfur content and a high specific surface area. |
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Keywords: | Sol-gel Sulfated zirconia Superacid catalyst Isomerization |
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