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

doi:10.1021/jp9613394

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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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 language	English (US)
Pages (from-to)	16302-16309
Number of pages	8
Journal	Journal of physical chemistry
Volume	100
Issue number	40
DOIs	https://doi.org/10.1021/jp9613394
State	Published - Oct 3 1996

All Science Journal Classification (ASJC) codes

General Engineering
Physical and Theoretical Chemistry

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

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.",

author = "Cremer, {Paul S.} and Xingcai Su and Shen, {Y. Ron} and Somorjai, {Gabor A.}",

year = "1996",

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doi = "10.1021/jp9613394",

language = "English (US)",

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T1 - Hydrogenation and dehydrogenation of propylene on Pt(111) studied by sum frequency generation from UHV to atmospheric pressure

AU - Cremer, Paul S.

AU - Su, Xingcai

AU - Shen, Y. Ron

AU - Somorjai, Gabor A.

PY - 1996/10/3

Y1 - 1996/10/3

N2 - 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.

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

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