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Catalytic C-O bond hydrogenolysis of tetrahydrofuran-dimethanol over metal supported WOx/TiO2 catalysts

Journal Article · · Applied Catalysis B: Environmental

M-WOx/TiO2 (M = Pt-, Rh-, Pd-, and Ru) catalysts were prepared and studied for tetrahydrofuran-dimethanol (THFDM) hydrogenolysis. All catalysts have a small metal particle size (< 2 nm) but show catalytic activities that differ by two orders of magnitude. From a combination of CO chemisorption and STEM, we conclude that this wide gap in activity is primarily due to overgrowth of WOx/TiO2 covering the metal particle of the less-active catalysts. This overgrowth decreases the number of exposed hydrogenation sites in these catalysts, lowering the overall reaction rate. The catalyst with the highest activity (Pt-WOx/TiO2) was studied at various pressures of H2, with catalytic activity passing through a maximum with increasing pressure. This is likely due to changes in the oxidation state of Wδ+ on the catalyst surface, which changes from W6+ to W5+ and W4+ with increasing hydrogen pressure. Moreover, H2 can strongly adsorb on the catalyst surface and inhibit the activity at high hydrogen pressure. The apparent activation energy of THFDM conversion over Pt-WOx/TiO2 is 47 kJ·mol-1. Pt-WOx/TiO2 showed a decrease in conversion from 45% to 23% over 46 h on stream in a continuous flow reactor. Catalyst deactivation is likely due to leaching of W. THFDM can be efficiently converted to 1,2,6-hexanetriol (HTO) in the presence of Pt/TiO2 and homogeneous W salts.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office
Grant/Contract Number:
EE0006878
OSTI ID:
1799261
Alternate ID(s):
OSTI ID: 1778293
Journal Information:
Applied Catalysis B: Environmental, Journal Name: Applied Catalysis B: Environmental Vol. 258; ISSN 0926-3373
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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