Isomerization of n-hexadecane over Pt-WO 3 catalysts supported on TiO 2-SiO 2 mixed oxides synthesized by glycothermal method

Abstract

The isomerization of n-hexadecane over Pt -WO 3 catalysts supported on TiO 2-SiO 2 synthesized by glycothermal reaction with various Si/Ti molar ratios was examined. The catalyst performance depended on Si/Ti molar ratio and WO 3 loading. The characterization of the catalysts by XRD, XAFS, UV-vis and so on revealed that with increasing the WO 3 loading, the structure of surface W species changed from monomeric species to polytungstate species, which is considered to significantly affect the isomerization selectivity of the catalysts.