Novel oxidative-acidic bifunctional catalyst of tungsten-phosphate modified silica-titania

Abstract

A novel oxidative-acidic bifunctional catalyst of tungsten-phosphate supported silica-titania was successfully synthesized and characterized. Different tungsten amount was impregnated into silica-titania followed by phosphoric acid treatment via sol gel method. The impregnation of WO3 and PO4 3 - into TiO2 -SiO2 followed by drying and calcination gave the greyish colour to the samples. X-ray diffractograms of the samples showed the structures of TiO2 -SiO2 remained as amorphous structure after loading of WO3 and PO4 3- . The catalytic performance of the samples of PO4 3- /xW/TiO2 -SiO2 , (x = 1- 5wt %) as bifunctional catalyst in the formation of 1,2-octanediol through conversion of 1-octene to of 1,2-epoxyoctane using aqueous H2O2 as an oxidant was evaluated. It has been demonstrated that PO4 3- /5W/TiO2 -SiO2 was an active bifunctional oxidative-acidic catalyst in producing 1,2-octanediol from 1-octene.