Ring-opening reactions of ethylene oxide on Pd(110) surfaces

摘要: Abstract Ethylene oxide (EO) reactions on Pd(110) surfaces were investigated under ultra-high vacuum conditions using temperature programmed reaction/desorption. EO adsorbed clean at 120–260 K underwent ring-opening, leading to the formation of methane 325 K. The ratio CO produced exhibited a dependence coverage. Furthermore, deuterium coadsorption experiments containing up two atoms, suggestive presence hydrocarbon species less hydrogen-rich than methyl groups surface. There was also evidence C2 dehydrogenation ca. 450 K, reminiscent ethylene These observations are consistent with release CH2 in course decomposition this However, is contrast acetaldehyde decarbonylation surface, where appears lead Studies oxygen-precovered indicated that oxidation does not proceed via carboxylate intermediates; rather epoxide decomposes CO, which combines oxygen surface produce carbon dioxide. Again, light chemistry metal surfaces, acetate intermediates formed, it suggested ring-opening isomerization an intermediate, but occurs by sequential CO and CC scission reactions.