Berlin 2005 – wissenschaftliches Programm

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O: Oberflächenphysik

O 3: Oberfl
ächenreaktionen I

O 3.4: Vortrag

Freitag, 4. März 2005, 11:30–11:45, TU EB420

Hydrogen Transfer Reaction on the Surface of an Oxide catalyst — •Daniela Crihan, Marcus Knapp, and Herbert Over — Phys.Chem.Institut, Justus Liebig Univ. Giessen, D-35392 Giessen

RuO-1ex2(110) exposes two kinds of active surface species (acidic and basic centers) which govern the interaction of the gas phase in contact with the catalysts surface. Here we will elucidate the cooperative interplay of these two active surface sites for a simple model reaction, namely the water formation over RuO-1ex2(110) catalysts when supplying hydrogen and oxygen from the gas phase. The bridging O atoms harvest the hydrogen from the gas phase, while the on-top O atoms picks up those adsorbed hydrogen atoms from the bridging O atoms to form water. This mechanism of hydrogen transfer is mediated by a strong hydrogen bond. Hydrogen transfer is expected to play a vital role for the whole class of catalyzed hydrogenation and dehydrogenation reactions of hydrocarbons over RuO-1ex2(110).