Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 33: Poster: Supported Nanoclusters and Catalysis

O 33.2: Poster

Tuesday, March 19, 2024, 18:00–20:00, Poster C

Photocatalytic Alcohol Reforming on Platinum Cluster Co-Catalyst Loaded Titania(110) — •Anna Lemperle, Philip Petzoldt, Lucia Mengel, Martin Tschurl, and Ueli Heiz — Chair of Physical Chemistry, School of Natural Sciences & Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4, 85748 Garching, Germany

Sunlight is a widely abundant resource, whose potential applications have come into focus in the face of environmental challenges. The field of photocatalysis aims to use light to power chemical reactions, thereby storing its energy inside chemical bonds. However, state of the art catalysts are limited in their performance. To systematically optimise the efficiency of photocatalysts, fundamental understanding of reaction mechanisms is essential. Only well-defined model systems allow to trace back catalytic results to distinct catalyst features and elucidate individual reaction steps. Alcohol reforming on metal loaded semiconductor single crystals under ultra-high vacuum conditions represents an ideal model reaction to enable such mechanistic studies. Encapsulation of clusters with a metal oxide overlayer caused by strong metal-support interactions are of particular interest, as it affects both turnover-frequency and selectivity of the catalyst.

In this poster, mechanistic insights gained from photocatalytic conversion of methanol over platinum cluster loaded TiO₂(110) single crystals will be presented. In particular, we will focus on the effects of reductive heating on the co-catalyst and support demonstrating the importance of a profound understanding of their interplay.

Keywords: photocatalysis; titania; platinum clusters; methanol