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Adsorption of CO, CO2, H2, and H2O on titania surfaces with different oxidation states

Journal Article · · J. Phys. Chem.; (United States)
DOI:https://doi.org/10.1021/j100270a024· OSTI ID:6270512
The adsorptive properties of titania surfaces with different oxidation states were proved by temperature-programmed desorption (TPD) of CO, H2, CO2, and H2O. Auger electron spectroscopy and X-ray photoelectron spectroscopy revealed that vacuum annealing an oxidized titanium foil at temperatures from 300 to 800 K was an effective means of systematically varying the average surface oxidation state from TiU to TiS . Carbon monoxide weakly adsorbed (desorption energy of 44-49 kJ x mol ) in a carbonyl fashion on coordinatively unsaturated cation sites. Titania surfaces were inert with respect to H2 adsorption and dissociation. Carbon dioxide adsorbed in a linear molecular fashion. Water adsorbed both molecularly and dissociatively. Results are discussed in terms of the role of titania oxidation state in CO hydrogenation over titania-supported metal catalysts. 74 references, 7 figures.
Research Organization:
Univ. of Wisconsin, Madison
OSTI ID:
6270512
Journal Information:
J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 89:24; ISSN JPCHA
Country of Publication:
United States
Language:
English