title: Selective hydrodeoxygenation of cyclic vicinal diols to cyclic alcohols over tungsten oxide-palladium catalysts.
abstract: Hydrodeoxygenation of cyclic vicinal diols such as 1,4-anhydroerythritol was conducted over catalysts containing both a noble metal and a group 5-7 transition-metal oxide. The combination of Pd and WOx allowed the removal of one of the two OH groups selectively. 3-Hydroxytetrahydrofuran was obtained from 1,4-anhydroerythritol in 72 and 74% yield over WOx -Pd/C and WOx -Pd/ZrO2 , respectively. The WOx -Pd/ZrO2 catalyst was reusable without significant loss of activity if the catalyst was calcined as a method of regeneration. Characterization of WOx -Pd/C with temperature-programmed reduction, X-ray diffraction, and transmission electron microscopy/energy-dispersive X-ray spectroscopy suggested that Pd metal particles approximately 9 nm in size were formed on amorphous tungsten oxide particles. A reaction mechanism was proposed on the basis of kinetics, reaction results with tungsten oxides under an atmosphere of Ar, and density functional theory calculations. A tetravalent tungsten center (W(IV) ) was formed by reduction of WO3 with the Pd catalyst and H2 , and this center served as the reductant for partial hydrodeoxygenation.
authors: Department of Applied Chemistry, School of Engineering, Tohoku University, Aoba 6-6-07, Aramaki, Aoba-ku, Sendai, 980-8579 (Japan).
authors: Yasushi
authors: Y
authors: Amada
authors: Nobuhiko
authors: N
authors: Ota
authors: Masazumi
authors: M
authors: Tamura
authors: Yoshinao
authors: Y
authors: Nakagawa
authors: Keiichi
authors: K
authors: Tomishige
mesh_terms: D000438:Alcohols / Q000737:chemistry*; D002384:Catalysis; D008958:Models, Molecular; D008968:Molecular Conformation; D010087:Oxides / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry*; D011789:Quantum Theory; D014414:Tungsten / Q000737:chemistry*
chemical_list: D000438:Alcohols; D010087:Oxides; D010165:Palladium; C511604:tungsten oxide; D010100:Oxygen; D014414:Tungsten
keywords: cyclic alcohols; heterogeneous catalysis; hydrodeoxygenation; palladium; tungsten oxide