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Distinct oxidation behaviors of π-bonded and di-σ-bonded propylene on Ag(1 1 1) |
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| Authors: | Weixin Huang Zhiquan Jiang J.M. White |
| Affiliation: | aHefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, MPG-CAS Partner Group of Fritz-Haber-Institut der MPG, University of Science and Technology of China, Hefei 230026, China bDepartment of Chemistry and Biochemistry, Center for Materials Chemistry, University of Texas at Austin, Austin, TX 78712, USA |
| Abstract: | We have investigated the propylene oxidation on Ag(1 1 1) by means of temperature-programmed reaction spectroscopy (TPRS) and reflection-absorption infrared spectroscopy (RAIRS). Existence of atomic oxygen on the surface greatly enhances the interaction of propylene with Ag(1 1 1) at 100 K. With the coverage of oxygen adatoms increasing, a gradual transition from the π-bonded propylene to the di-σ-bonded propylene was observed. Only a small fraction of oxygen adatoms participate the propylene oxidation reaction. Three propylene oxidation pathways were observed, leading to the formation not only of combustion products (CO2) but also of partially oxidation products (CO and acetone). RAIRS results evidence the formation of hydroxyls on the surface at elevated temperatures. Both TPRS and RAIRS results reveal that the π-bonded and di-σ-bonded propylene follow different combustion mechanisms. |
| Keywords: | Propylene oxidation Ag(1 1 1) Temperature-programmed reaction spectroscopy Reflection-absorption infrared spectroscopy |
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