AVS 53rd International Symposium
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP37
Adsorption Reaction of C2H5SH on Rh(100) Surface Studied by XPS and Sulfur K-edge NEXAFS

Tuesday, November 14, 2006, 6:00 pm, Room 3rd Floor Lobby

Session: Surface Science Poster Session
Presenter: S. Yagi, Nagoya University, Japan
Authors: S. Yagi, Nagoya University, Japan
T. Nomoto, Nagoya University, Japan
A. Koizumi, Nagoya University, Japan
G. Kutluk, Hiroshima University, Japan
K. Soda, Nagoya University, Japan
E. Hashimoto, Hiroshima University, Japan
M. Taniguchi, Hiroshima University, Japan
Correspondent: Click to Email
There are various environmental problems. One of the causes is automobile exhaust gas. Thereforean efficient automobile catalyst is needed for the exhaust gas (SOx, NOx, CxHy) purification. Sincethe purification catalyst loses its activity in a sulfur-containing molecular atmosphere, which is named "Sulfur Poisoning", the adsorbed sulfur have a great influence on the catalyst performance. It isimportant to investigate the reaction of sulfur containing molecules on the catalyst surface. Incomparison with other platinum group metals, rhodium especially have much resistance to the sulfur poisoning.@footnote 1@ In this investigation, we have studied the adsorption structure of C2H5SH on Rh(100)surface by X-ray Photoelectron Spectroscopy (XPS) and S K-edge Near Edge X-ray Absorption FineStructure (NEXAFS) methods. The Rh(100) surface was cleaned by the repeated operation (Ar+ sputtering and annealing) and thenexposed by C2H5SH at 85 K. Both XPS and NEXAFS measurements were carried out at the soft X-ray double crystal monochromator beamline BL-3 on Hiroshima Synchrotron Radiation Center(HSRC). C2H5SH coverage is submonolayer phase and estimated to be 0.15 ML. The S2p XPS results showthat the C2H5SH molecules dissociate to ethanethiolate C2H5S- and atomic sulfur. The C1s XPS results indicate that some hydrocarbons(CxHy) adsorb on Rh(100) surface. It is clear that theadsorbed C2H5SH, C2H5S- and hydrocarbons behaviors depend on substrate temperature. @FootnoteText@@footnote 1@ J.S.Hepburn et al., Energy & Fuels 2 (1988) 289.