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

Abstract

A novel oxidative-acidic bifunctional catalyst of silica-titania supported tungsten-phosphate 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 PO43- into TiO2-SiO2 followed by drying and calcination gave the white 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 PO43-. The catalytic performance of the samples of PO43-/xW/TiO2-SiO2, (x = 1 and 5 wt %) as bifunctional catalyst in the formation of 1,2-octanediol through conversion of 1-octene to 1,2-epoxyoctane using aqueous H2O2 as an oxidant was evaluated. It has been demonstrated that PO43-/5W/TiO2-SiO2 was an active bifunctional oxidative-acidic catalyst in producing 1,2-octanediol from 1-octene.