B3 – In situ/operando Characterization of Noble Metal Clusters and Particles on Metal Oxides at Work

Objective

This project aims at tracking and correlating the structure and activity of oxide-supported metals under steady and transient reaction conditions. For this purpose, operando X-ray absorption/emission and IR spectroscopy complemented by in situ TEM will be applied to investigate selected catalysts based on Pt, Pd and Pt-Pd nanoparticles deposited on well-defined CeO2, TiO2, and Al2O3 supports under emission control reaction conditions. The complementary techniques will elucidate the impact of fluctuations in the gas feed and temperature on the sintering behavior, oxidation/reduction, redispersion processes, morphology changes of nanoparticles and segregation processes in bimetallic systems.

Project-related publications by participating researchers

Prof. Dr. Jan-Dierk Grunwaldt

J.-D. Grunwaldt, J. B. Wagner, R. E. Dunin-Borkowski, Imaging catalysts at work: A hierarchical approach from the macro- to the meso- and nano-scale. ChemCatChem, 2013, 5, 62-80

DOI: 10.1002/cctc.201200356

Y. Zhou, D. E. Doronkin, M. Chen, S. Wei, J.-D. Grunwaldt, Interplay of Pt and crystal facets of TiO2: CO oxidation activity and operando XAS/DRIFTS studies. ACS Catal. 2016, 6, 7799-7809

DOI: 10.1021/acscatal.6b01509

F. Benzi, T. L. Sheppard, D. E. Doronkin, D. M. Meira, A. M. Gänzler, S. Baier, J.-D. Grunwaldt, Transient structural and catalytic behaviour of Pt-particles probed by operando spectroscopy during a realistic driving cycle. Catal. Sci. Technol. 2017, 7, 3999-4006

DOI: 10.1039/C7CY00926G

A. M. Gänzler, M. Casapu, P. Vernoux, S. Loridant, F. J. Cadete Santos Aires, T. Epicier, B. Betz, R. Hoyer, J.-D. Grunwaldt, Tuning the structure of Platinum particles on ceria in situ for enhancing the catalytic performance of exhaust gas catalysts. Angew. Chem. Int. Ed. 2017, 56, 13078-13082

DOI: 10.1002/anie.201707842

A. M. Gänzler, M. Casapu, F. Maurer, H. Störmer, D. Gerthsen, G. Ferré, P. Vernoux, B. Bornmann, R. Frahm, V. Murzin, M. Nachtegaal, M. Votsmeier, J.-D. Grunwaldt, Tuning the Pt/CeO2 interface by in situ variation of the Pt particle size. ACS Catal. 2018, 8, 4800-4811

DOI: 10.1021/acscatal.8b00330

Prof. Dr. Christof Wöll

M. Xu, H. Noei, K. Fink, M. Muhler, Y. Wang, C. Wöll, The surface science approach for under-standing reactions on oxide powders: the importance of IR spectroscopy. Angew. Chem. Int. Ed. 2012, 51, 4731-4734

DOI: 10.1002/anie.201200585

V. Schott, H. Oberhofer, A. Birkner, M. Xu, Y. Wang, M. Muhler, K. Reuter, C. Wöll, Chemical activity of thin oxide layers: Strong interactions with the support yield a new thin-film phase of ZnO. Angew. Chem. Int. Ed. 2013, 52, 11925-11929

DOI: 10.1002/anie.201302315

D. Silber, P. Kowalski, F. Traeger, M. Buchholz, F. Bebensee, B. Meyer, C. Wöll, Adsorbate-induced lifting of substrate relaxation is a general mechanism governing titania surface chemistry. Nat. Comm. 2016, 7, 12888

DOI: 10.1038/ncomms12888

C. W. Yang, X. Yu, S. Heissler, A. Nefedov, S. Colussi, J. Llorca, A. Trovarelli, Y. Wang, C. Wöll, Surface faceting and reconstruction of ceria nanoparticles. Angew. Chem. Int. Ed. 2017, 56, 375-379

DOI: 10.1002/anie.201609179

Y. Wang, C. Wöll, IR spectroscopic investigations of chemical and photochemical reactions on metal oxides: Bridging the materials gap. Chem Soc. Rev. 2017, 46, 1875-1932

DOI: 10.1039/C6CS00914J