Competing pathways for methoxy decomposition on oxygen-covered Mo(110)
- Department of Chemistry, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138 (United States)
The reactions of methanol (CH{sub 3}OH) are investigated on a range of oxygen overlayers on Mo(110), with {theta}{sub O} from {approximately}0.5 to {gt}1 ML, using a combination of vibrational spectroscopies and temperature-programmed reaction. Infrared spectroscopy identifies a common, tilted methoxy intermediate at high temperature on all overlayers studied; electron energy loss spectroscopy shows that this intermediate decomposes to deposit oxygen exclusively in high-coordination sites. While C{endash}O bond scission to evolve gas-phase methyl radicals is the only reaction observed for methoxy on highly oxidized Mo(110), on the surface oxygen overlayers competition between dehydrogenation and methyl evolution is highly sensitive to oxygen coverage. The enhanced selectivity for hydrocarbon formation from methanol reaction on oxygen-modified Mo(110) relative to the clean surface is attributed to inhibition of dehydrogenation pathways rather than to marked changes in the C{endash}O bond potential of methoxy. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 659303
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 14 Vol. 109; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
Similar Records
Reactions of methanethiol on cobalt-covered Mo(110)
Alcohol chemistry as a probe of mixed-metal phases: Reactions of 2-propanol on cobalt-covered Mo(110)