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Employing hot tungsten filament to thermal dissociate molecular hydrogen,we generated gas phase atomic hydrogen under ultra-high vacuum(UHV)conditions and investigated its interaction with Pt(111) surface.Thermal desorption spectroscopy(TDS)results demonstrate that adsorption of molecular hy- drogen on Pt(111)forms surface Had species whereas adsorption of atomic hydrogen forms not only surface Had species but also bulk Had species.Bulk Had species is more thermal-unstable than surface Had species on Pt(111),suggesting that bulk Had species is more energetic.This kind of weakly- adsorbed bulk Had species might be the active hydrogen species in the Pt-catalyzed hydrogenation reactions.
We generated gas phase atomic hydrogen under ultra-high vacuum (UHV) conditions and investigated its interaction with Pt (111) surface. Thermal desorption spectroscopy (TDS) results demonstrate that the adsorption of molecular hy- drogen on Pt (111) forms surface Had species while adsorption of atomic hydrogen forms not only surface Had species but also bulk Had species. Bulk Had species is more thermal-unstable than surface Had species on Pt (111), suggesting that bulk Had species is more energetic.This kind of weakly-adsorbed bulk Had species might be the active hydrogen species in the Pt-catalyzed hydrogenation reactions.