title: Role of Re species and acid cocatalyst on Ir-ReOx /SiO2 in the C-O hydrogenolysis of biomass-derived substrates.
abstract: The catalytic performance of ReOx -modified Ir metal catalyst in the hydrogenolysis of C-O bonds is strongly dependent on the choice of solvent. The acidic property of the Re species becomes obvious in the alkane solvent, and the hydrogenolysis reaction proceeds mainly by acid-catalyzed dehydration and the subsequent metal-catalyzed hydrogenation. The acidic property of the Re species is weakened in water; however, the hydrogenolysis reaction proceeds in water via a direct mechanism involving SN 2-like attack of a hydride species at the interface between Ir and ReOx on the adsorbed Re alkoxide species. This mechanism enabled the selective dissociation of the C-O bond neighboring the CH2 OH group.
authors.affiliation: Department of Applied Chemistry, School of Engineering, Tohoku University, Sendai, Japan. tomi@erec.che.tohoku.ac.jp.
authors.forename: Keiichi
authors.initials: K
authors.lastname: Tomishige
authors.forename: Masazumi
authors.initials: M
authors.lastname: Tamura
authors.forename: Yoshinao
authors.initials: Y
authors.lastname: Nakagawa
mesh_terms: D000143:Acids / Q000737:chemistry*; D018533:Biomass; D002241:Carbohydrates / Q000737:chemistry; D002384:Catalysis; D006859:Hydrogen / Q000737:chemistry; D007495:Iridium / Q000737:chemistry*; D012211:Rhenium / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry
chemical_list: D000143:Acids; D002241:Carbohydrates; D012997:Solvents; D007495:Iridium; D012211:Rhenium; D012822:Silicon Dioxide; D006859:Hydrogen
keywords: heterogeneous catalysis; hydrogenolysis; iridium; rhenium; supported catalysts