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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