Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 50: Supported Nanoclusters: Structure, Reaction, Catalysis

O 50.2: Talk

Wednesday, March 20, 2024, 10:45–11:00, TC 006

Elucidating the Role of the Degree of Reduction in the Alcohol Photooxidation over Titania(110) Photocatalysts — •Philip Petzoldt, Lucia Mengel, Anna Lemperle, Martin Tschurl, and Ueli Heiz — Chair of Physical Chemistry, School of Natural Sciences & Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4, 85748 Garching, Germany

Titania is one of the most widely investigated metal-oxides in surface science and often considered the archetypical heterogeneous photocatalyst. Fundamental studies have deepened the understanding of its thermal and photochemical reactivity on the atomic scale as well as the interplay with nanoparticulate co-catalysts. However, a critical but commonly neglected parameter of titania is the degree of its reduction and consequential impacts on the (photo)reactivity.

In this contribution, we address this aspect by investigating the alcohol photooxidation reaction over Pt cluster-loaded Titania(110) single crystals, while systematically changing the degree of reduction of the photocatalyst. Our results provide new insights into different factors governing the photoreactivity and underline the importance of kinetics in photocatalysis.

Keywords: photocatalysis; titania; platinum clusters; methanol