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Distinct oxidation behaviors of π-bonded and di-σ-bonded propylene on Ag(1 1 1)

✍ Scribed by Weixin Huang; Zhiquan Jiang; J.M. White

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
437 KB
Volume
131
Category
Article
ISSN
0920-5861

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✦ Synopsis

We have investigated the propylene oxidation on Ag(1 1 1) by means of temperature-programmed reaction spectroscopy (TPRS) and reflectionabsorption 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 p-bonded propylene to the di-s-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 (CO 2 ) 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 p-bonded and di-sbonded propylene follow different combustion mechanisms.

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