Abstract
Acid tr eatment using H2SO4, HCl and H3PO4 has been carried ou t in an attempt to improve catalytic performance of silica-titania aerogel. X-ray diffraction results s howed the amorphous structure of the aerogels remained after the acid impregnation and calcinations steps. Hammert analysis revealed these acid modified silica-titania aerogels were superacids with pKa < -14.52. Different Ti species was observed in the samples upon the acid treatment. As compared to silica-titania aerogel, Lewis acidity increased remarkably in HCl treated sample without formation of any Bronsted acid site. Meanwhile, H2SO4 and H3PO4 treate d samples possessed both Lewis and Bronsted acid sites. The catalytic performance of these samples was evaluated through a consecutive transformation of 1-octene to 1,2-octanediol through the formation of 1,2-epoxyoctane using aqueous hydrogen peroxide as oxidant.
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