Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 109: Heterogeneous Catalysis on Metal Oxides

O 109.4: Talk

Thursday, March 19, 2020, 15:45–16:00, TRE Phy

Poisoning by Hydroxylation: Photoreforming of Primary Alcohols on Rutile Titania — •Martin Tschurl, Carla Courtois, Moritz Eder, Constantin Walenta, and Ueli Heiz — Chair of Physical Chemistry, Department of Chemistry & Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4, 85748 Garching, Germany

Some years ago, we reported the catalyst poisoning during the photoreaction of ethanol on a titania(110) single crystal in an ultra-high vacuum atmosphere. In this work, we now focus on the origins of this peculiar reaction property. The comparison of different alcohols enables a closer look into the reaction mechanism, in order to determine the decisive factors for the inhibition of the reaction. For this purpose all steps of the reaction sequence, the alcohol adsorption, the migration of photon-generated charges, the photochemical reaction and the desorption of the oxidized products, are discussed to finally reveal the reason for the poisoning.