Enhancement of activity by pulsed laser post processing of heterogenous catalysts

Sven Reichenberger, University of Duisburg-Essen, Duisburg, Germany
Marcus Lau, TRUMPF Laser- und Systemtechnik GmbH, Ditzingen, Germany
Galina Marzun, University of Duisburg-Essen, Duisburg, Germany
Baoxiang Peng, Ruhr-University Bochum, Bochum, Germany
Martin Muhler, Ruhr-University Bochum, Bochum, Germany
Astrid Müller, University of Rochester, New York City, USA
Stephan Barcikowski, University of Duisburg-Essen, Essen, Germany

The scalable application of lasers for providing and developing surfactant-free, active heterogenous catalysts is a young and aspiring method in literature on catalysis.[1-4] Especially the intrinsic purity and the independent adjustability of nanoparticle size, load and composition enables a novel research agenda for basic and applied catalysis research.[4] Inspired by the latter, post processing of catalyst supports [5] as well as already active heterogenous catalysts [6] offers a novel aspect especially in order to tune the defect structure of pre-designed materials independent of composition, nanoparticle size or load. Consequently this approach sets new impulses to improve the catalytic activity and deepen the understanding of underlying structure-activity correlations and mechanisms of respective catalytic reactions.

Within this brief talk, a laser-based defect-engineering agenda to tune the catalytic activity of AuTiO2 catalysts will be presented and discussed in terms of laser parameters as well as the type of catalytic reaction (photocatalysis [6 and selective oxidation [4]). It will be shown, how the laser-induced alteration affects material properties and catalytic performance of the same catalysts applied in different catalytic reactions and how this is linked to the presence and location of respective material defects.

The authors gratefully acknowledge the funding provided by the Mercator Research Centre Ruhr (MERCUR) project Pr-2016-0044 and the Collaborative Research Center CRC/TRR 247 “Heterogeneous Oxidation Catalysis in the Liquid Phase”.

[1] J. Zhang, J. Claverie,M. Chaker, D. Ma, ChemPhysChem 18 (9), 986-1006, 2017
[2] D. Zhang, B. Gökce, S. Barcikowski, Chemical Reviews 117 (5), 3990–4103, 2017.
[3] D. Zhang, J. Liu, P. Li, Z. Tian, C. Liang, ChemNanoMat 3 (8), 512-533, 2017
[4] W. Dong, S. Reichenberger, S. Chu, P. Weide, H. Ruland, S. Barcikowski, P. Wagener, M. Muhler, Journal of Catalysis, 330, 497-506 , 2015.
[5] F. Waag, B. Goekce, C. Kalapu, G. Bendt, S. Salamon, J. Landers, U. Hagemann, M. Heidelmann, S. Schulz, H. Wende, N Hartmann, M. Behrens, S. Barcikowski, Scientific Reports, 2017, 7, 1-13
[6] M. Lau, S. Reichenberger, I. Haxhiaj, S. Barcikowski, A. M. Müller, ACS Applied Energy Materials (2018), accepted

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