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Spectroscopic study of the adsorption of C/sub 2/H/sub 4/ and C/sub 2/H/sub 2/ on a rare-earth single crystal. 2. Oxidized Gd(0001)

Journal Article · · J. Phys. Chem.; (United States)
DOI:https://doi.org/10.1021/j100316a052· OSTI ID:7004991
The adsorption of ethylene and acetylene on a rare earth oxide surface has been studied primarily by ultraviolet photoemission and Auger electron spectroscopies. The gadolinium oxide surface is produced by exposure of the clean Gd(0001) surface at 300 K to O/sub 2/. The adsorption probability for ethylene is at least a factor of 3 and probably a factor of 100 lower than tat for acetylene on the oxidized surface at 165 K. The surface species formed upon low-temperature acetylene adsorption is identified as a molecular C/sub 2/H/sub 2/. The molecularly adsorbed C/sub 2/H/sub 2/ decomposes below a substrate temperature of 350 K, leaving carbon on the surface. These results are compared with those of a previous study of C/sub 2/H/sub 2/ and C/sub 2/H/sub 4/ adsorption on the metallic GD(0001) surface. The possible catalytic significance of the selectivity of the oxidized Gd surface toward acetylene adsorption is discussed.
Research Organization:
Massachusetts Institute of Technology, Cambridge (USA)
OSTI ID:
7004991
Journal Information:
J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:5; ISSN JPCHA
Country of Publication:
United States
Language:
English