The hydrogenation and dehydrogenation of carbon(2)-carbon(4) hydrocarbons on platinum(111) monitored in situ over 13 orders of magnitude in pressure with infrared-visible sum frequency generation

The hydrogenation and dehydrogenation of ethylene, propylene, and isobutene were monitored in situ during heterogeneous catalysis over Pt(111)between ;Olefin dehydrogenation experiments were carried out with SFG under ultra high vacuum (UHV) conditions on the (111) crystal face of platinum. Ethylene chemisorbed on Pt(111)below 230 K in the di-;Hydrogenation of ethylene was carried out between 1 Torr and 700 Torr of H;The hydrogenation of propylene was carried out under the same conditions as ethylene. It was found that propylene hydrogenates from...