Formation of a stable surface oxametallacycle that produces ethylene oxide.
作者： Suljo Linic , Mark A. Barteau
DOI: 10.1021/JA0118136
关键词: Adsorption 、 Transition metal 、 Density functional theory 、 Chemistry 、 Thermal desorption spectroscopy 、 Ethylene 、 Ethylene oxide 、 Electron energy loss spectroscopy 、 Photochemistry 、 Infrared spectroscopy 、 Stereochemistry
摘要: Temperature programmed desorption, high-resolution electron energy loss spectroscopy (HREELS), and density functional theory (DFT) were used to investigate the adsorption reaction of ethylene oxide (EO) on Ag(111) surface. When EO is dosed onto at 140 K it adsorbs molecularly, desorbing without ∼200 K. On other hand, when 250 K, ring-opening activated, a stable surface intermediate formed. This reacts 300 re-form plus few products. HREELS DFT studies suggest that this oxametallacycle. Moreover, activation energies observed for oxametallacycle form are in an excellent agreement with values reported steady-state epoxidation process. work represents first demonstration ring-closure EO. Comparison spectroscopic results obtained from silver single crystals supported cataly...
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