Berlin 2005 – wissenschaftliches Programm
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O: Oberflächenphysik
O 42: Oberfl
ächenreaktionen II
O 42.7: Vortrag
Dienstag, 8. März 2005, 12:15–12:30, TU EB407
Ellipsometric Confirmation of the Phase Transition in Methanol Oxidation over Copper Surface — •Ling Zhou1, Sebastian Günther2, and Ronald Imbihl1 — 1Institut für Physikalische Chemie und Elektrochemie, Universität Hannover — 2Department Chemie, Ludwig-Maximilians-Universität München
The kinetics of methanol oxidation over metallic and oxidized copper surface has been studied in the 10−2 mbar range. It was found that the different phases over the copper sample lead to different reactivity. Comparing with the metallic copper surface, the partially oxidized copper surface has higher reactivity to produce formaldehyde whereas the deep oxidized surface shows more total oxidation to CO2 . The phase transition during the reactions can be well defined by the optics and ellipsometer which is in favour of determining the active phase in methanol selective oxidation to formaldehyde.