Adsorption of thermal D atoms on Sn/Pt(111) surface alloys

Reactivity of Ethyl Groups on a Sn/Pt(111) Surface Alloy

“…There are two possible origins of the H 2 peak at 380 K in addition to the cracking fraction of desorbed hydrocarbons (ethane and ethylene) that are products from ethyl dehydrogenation. Adsorbed hydrogen adatoms recombine and desorb as H 2 below 300 K on the ffiffi ffi 3 p alloy [44] and so this excludes a pathway for coadsorbed H adatoms and ethyl to combine to produce ethane at 376 K. Adsorbed ethyl groups must obtain another additional H-atom from other ethyl groups to form ethane. Adsorbed ethyl species can lose one H through b-H elimination to produce ethylene and hydrogen adatoms, and this is a common pathway on most transition metal surfaces [4].…”

Hydrogenation of cyclohexanone on Pt–Sn surface alloys

“…The change in hydrogen reaction order is consistent with previous UHV studies of H 2 adsorption on the Pt-Sn alloys [22] where it was shown that the barrier for H 2 dissociative adsorption increases on these surfaces compared to Pt(111). In addition it is also known that hydrocarbon adsorption is also weaker on the Pt-Sn surface alloys [23][24][25]. On the alloys, the overall reaction rate, instead of being determined mostly by the reaction in Eq.…”

Hydrogen mediated transport of Sn to Ru film surface

“…Surface alloying of Sn deposited on Pt͑111͒ and Pd͑111͒ occurs at 300-400K. 11 The exothermic heats of formation of specific intermetallic compounds serve as a sufficient thermodynamic driving force for the formation of Sn-Pt alloy. A random alloy of increasing thickness was also detected at 300 K for vapor deposited Sn on Rh͑111͒.…”