PHOTOEMISSION STUDY OF THE REACTION OF CO WITH SmFILMS ON THE Ru(001) SURFACE

G. Ranga Rao () and H. Nozoye
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G. Ranga Rao: Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India;
H. Nozoye: Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan

Surface Review and Letters (SRL), 2003, vol. 10, issue 06, 917-923

Abstract: Photoemission spectroscopy (Ru 3d/C 1s and O 1s regions) has been used to investigate the formation of carbonate species on the Sm- andSmOx-covered Ru(001) surfaces at small exposures of CO. The results indicate that the reaction of ~ 1 L CO with disordered Sm layers on the Ru surface at 105 K produces surface carbonate and weakly boundCO2via the Boudouard reaction(2COg→CO2,ad+Cad). The latter species desorbs below 250 K, whereas the former is stable up to 500 K. The surface carbonate species is detected by the O 1s features as well as the C 1s feature developed in the Ru 3d region upon CO exposure. The CO reaction with theSmOxlayer also leads to the formation of surface carbonate. The generation of carbonate on Sm andSmOxfilms seems to be related to the ionization of Sm atoms and the defects present in the partly oxidized Sm, respectively.

Keywords: Sm2O3; Ru(001); surface carbonate; CO (search for similar items in EconPapers)
Date: 2003
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DOI: 10.1142/S0218625X03005700

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