Adsorption of Methyl Radicals on the Oxygen-Modified Mo(100) Surface

George H. Smudde; Min Yu; Peter C. Stair

doi:10.1021/ja00058a053

Adsorption of Methyl Radicals on the Oxygen-Modified Mo(100) Surface

George H. Smudde, Min Yu, Peter C. Stair

Northwestern University

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

The adsorption and surface reactions of free gas phase methyl radicals on oxygen-modified Mo(100) have been studied using a combination of temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). Methyl radicals were found to adsorb on the surface at room temperature. Upon heating the surface methyl groups decompose to form surface hydrogen. The surface hydrogen hydrogenates the remaining intact methyl groups leading to methane which desorbs from the surface. The carbon produced by dehydrogenation combines with surface oxygen to yield CO. Comparison of the surface chemistry and the measured C(1s) binding energy with surface methoxy and with CH₃ bonded to metal surfaces indicates that the methyl groups are primarily bonded to surface metal atoms to form a metal alkyl rather than to surface oxygen.

Original language	English
Pages (from-to)	1988-1993
Number of pages	6
Journal	Journal of the American Chemical Society
Volume	115
Issue number	5
DOIs	https://doi.org/10.1021/ja00058a053
Publication status	Published - Mar 1 1993

ASJC Scopus subject areas

Catalysis
Chemistry(all)
Biochemistry
Colloid and Surface Chemistry

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abstract = "The adsorption and surface reactions of free gas phase methyl radicals on oxygen-modified Mo(100) have been studied using a combination of temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). Methyl radicals were found to adsorb on the surface at room temperature. Upon heating the surface methyl groups decompose to form surface hydrogen. The surface hydrogen hydrogenates the remaining intact methyl groups leading to methane which desorbs from the surface. The carbon produced by dehydrogenation combines with surface oxygen to yield CO. Comparison of the surface chemistry and the measured C(1s) binding energy with surface methoxy and with CH3 bonded to metal surfaces indicates that the methyl groups are primarily bonded to surface metal atoms to form a metal alkyl rather than to surface oxygen.",

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AU - Smudde, George H.

AU - Yu, Min

AU - Stair, Peter C.

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N2 - The adsorption and surface reactions of free gas phase methyl radicals on oxygen-modified Mo(100) have been studied using a combination of temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). Methyl radicals were found to adsorb on the surface at room temperature. Upon heating the surface methyl groups decompose to form surface hydrogen. The surface hydrogen hydrogenates the remaining intact methyl groups leading to methane which desorbs from the surface. The carbon produced by dehydrogenation combines with surface oxygen to yield CO. Comparison of the surface chemistry and the measured C(1s) binding energy with surface methoxy and with CH3 bonded to metal surfaces indicates that the methyl groups are primarily bonded to surface metal atoms to form a metal alkyl rather than to surface oxygen.

AB - The adsorption and surface reactions of free gas phase methyl radicals on oxygen-modified Mo(100) have been studied using a combination of temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS). Methyl radicals were found to adsorb on the surface at room temperature. Upon heating the surface methyl groups decompose to form surface hydrogen. The surface hydrogen hydrogenates the remaining intact methyl groups leading to methane which desorbs from the surface. The carbon produced by dehydrogenation combines with surface oxygen to yield CO. Comparison of the surface chemistry and the measured C(1s) binding energy with surface methoxy and with CH3 bonded to metal surfaces indicates that the methyl groups are primarily bonded to surface metal atoms to form a metal alkyl rather than to surface oxygen.

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