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

Research output: Contribution to journalArticle

107 Citations (Scopus)

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

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Dehydrogenation
dehydrogenation
propylene
Atmospheric pressure
Hydrogenation
hydrogenation
Propylene
atmospheric pressure
Hydrogen
hydrogen
Propane
Graphite
propane
graphite
methylidyne
Infrared radiation
room temperature
Temperature

All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

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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.",
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Hydrogenation and dehydrogenation of propylene on Pt(111) studied by sum frequency generation from UHV to atmospheric pressure. / Cremer, Paul S.; Su, Xingcai; Shen, Y. Ron; Somorjai, Gabor A.

In: Journal of physical chemistry, Vol. 100, No. 40, 03.10.1996, p. 16302-16309.

Research output: Contribution to journalArticle

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AU - Cremer, Paul S.

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AB - 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.

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