Hydrogenation and dehydrogenation of propylene on Pt(111) studied by sum frequency generation from UHV to atmospheric pressure

Paul S. Cremer, Xingcai Su, Y. Ron Shen, Gabor A. Somorjai

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109 Scopus citations

Abstract

The reactions of adsorbed propylene on Pt(111) in the presence and absence of hydrogen have been studied over 13 orders of magnitude in pressure using infrared-visible sum frequency generation. In the presence of near ambient pressures of hydrogen and propylene at 295 K, propylene hydrogenation was observed to proceed from a physisorbed intermediate (π-bonded propylene) through a 2-propyl species (Pt-CH(CH3)2) to propane. Under UHV conditions in the absence of hydrogen, di-σ-bonded propylene was found to dehydrogenate to propylidyne just below room temperature and then to vinylmethylidyne (M≡CCHCH2) at 450 K on the way to graphite formation.

Original languageEnglish (US)
Pages (from-to)16302-16309
Number of pages8
JournalJournal of physical chemistry
Volume100
Issue number40
StatePublished - Oct 3 1996

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physical and Theoretical Chemistry

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