Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 40: Heterogeneous Catalysis: Experiment
O 40.4: Vortrag
Dienstag, 8. März 2016, 14:45–15:00, S053
CO and D2O chemistry on continuous and discontinuous samaria thin films on Pt(111) — Jin-Hao Jhang1, •Simona Keil1, Andreas Schaefer2, Volkmar Zielasek1, and Marcus Bäumer1 — 1Institute of Applied and Physial Chemistry, University of Bremen, Germany — 2Division of Synchrotron Radiation Research, Lund University, Sweden
The water-gas shift (WGS) reaction is among the most relevant for sustainable chemistry and energy conversion. Exemplarily for mixed metal – rare earth oxide WGS catalysts, the chemistry of CO and D2O, individually adsorbed or co-adsorbed, on epitaxial thin films and islands of samaria on Pt(111) was studied by temperature programmed desorption spectroscopy in ultra-high vacuum. The comparative study indicates that Sm2O3 islands provide lattice oxygen at their perimeter for oxidation of CO adsorbed on adjacent Pt area. However, the reduced SmOx islands are not fully reoxidized by subsequent exposure to D2O. Upon CO and D2O coadsorption, interaction between CO and OD species at the perimeter of SmOx islands promotes D2 formation but does not yield CO2 as product. The study demonstrates the relevance of structural details at interface sites between metal and oxide for chemical reactions.