Wu, K (reprint author), CHINESE ACAD SCI,DALIAN INST CHEM PHYS,STATE KEY LAB CATALYSIS,POB 110,DALIAN 116023,PEOPLES R CHINA.
Article; Proceedings Paper
Oxidation of carbon monoxide and ethylene on an in situ prepared ordered Pd(001)-C(2x2)Mn alloy surface was investigated by LEED and HREELS. At 140 K, coadsorption of carbon monoxide and oxygen gives anew HREELS feature at 2300 cm(-1) which is tentatively assigned to the formation of adsorbed carbon dioxide with the molecular axis nearly perpendicular to the alloy surface. Meanwhile, ethylene reacts with oxygen on the ordered alloy surface at temperatures higher than 230 K to produce surface hydroxyl species and adsorbed CO. Bimetallic composition and the buckled structure of the alloy surface are responsible for the high reactivity and the stabilization of reaction intermediates in the two oxidation processes.