%0 Journal Article %J Chemistry-an Asian Journal %D 2009 %T Kinetic evidence for the influence of subsurface oxygen on palladium surfaces towards CO oxidation at high temperatures %A Gopinath, Chinnakonda S. %A Thirunavukkarasu, Kandasamy %A Nagarajan, Sankaranarayanan %K Adsorption %K kinetics %K Oxidation %K Palladium %K surface analysis %X

Transient state kinetics of the catalytic oxidation of CO with 0, on Pd-surfaces has been measured under isothermal conditions by using a molecular beam approach. Systematic studies were carried out as a function of reaction temperature and CO+O(2) composition. With sufficient kinetic evidence, we have demonstrated the positive influence of subsurface oxygen towards CO-adsorption and oxidation to CO, at high temperatures (600-900 K) on Pd-surfaces, and the likely electronic nature of the surface changes with oxygen in the subsurface. These studies also provide a direct proof for CO-adsorption with a significantly reactive sticking coefficient at high temperatures on Pd-surfaces exhibiting a significant subsurface O-coverage.

%B Chemistry-an Asian Journal %I WILEY-V C H VERLAG GMBH %C PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY %V 4 %P 74-80 %8 OCT %G eng %N 1 %3 Foreign %4 4.188 %R 10.1002/asia.200800278