[2C09-15] Synchrotron Radiation Surface Science 

4:50 PM - 5:05 PM JST(7:50 AM - 8:05 AM UTC)

[2C15] Step-site-promoted methanol decomposition on Cu(977) under near-ambient-pressure conditions

*Yoshiko Sakaguchi¹, Kozo Mukai¹, Takuji Iimori¹, Kenta Kuroishi¹, Wei-Chih Hsiao¹, Masafumi Horio¹, Haruto Sakurai¹, Iwao Matsuda¹, Jun Yoshinobu¹ (1. The Institute for Solid State Physics(ISSP), the University of Tokyo (Japan))

Methanol decomposition on well-defined Cu(977) was investigated by synchrotron radiation NAP-XPS at NanoTerasu BL-08U combined with QMS and also studied by NAP-IRAS in the laboratory. NAP-XPS revealed a dominant C 1s component at 284.7 eV assigned to CHx and/or C species, a component around 287.5 eV suggesting formate species, and weak 288–293 eV features tentatively assigned to satellite structures of adsorbed CO. O 1s spectra indicated formate, OH-, and H₂O-related species. QMS simultaneously detected formaldehyde, CO, and H₂O as desorption produced from the surface. In addition, NAP-IRAS showed methoxy bands at 2815, 2892, 2919, and 1022 cm^-1 and a CO band even at 2 × 10^-6 Torr. These results show that Cu step sites strongly promote methoxy formation and its multiple pathways including decomposition and desorption.

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