A2 - Reactivity and Sintering of Size- and Composition-Selected Clusters on Supports


For better mechanistic understanding of atomic scale reaction mechanisms, we will apply mass-selective ion deposition of Ptx=1-80, Pdy=1-150 and PtxPdy onto oxide supports (CeO2, patterned graphene/CeO2, Si/SiO2, TiO2 and Al2O3). The clusters’ structural changes, size dispersion, sintering, reactivity and catalytic activity will be tracked under conditions approaching those of engine exhaust catalysis. Local probe (STM) and ensemble averaging (XPS, TDS, FT-IR, NAP-XPS) surface characterization will be correlated with MS-based probes of reactivity to study CO and NO oxidation, NO reduction by CO and CH4 oxidation.

Project-related publications by participating researchers

Prof. Dr. Manfred Kappes

R. Popescu, R. Schneider, D. Gerthsen, A. Böttcher, D. Loffler, P. Weis, M. Kappes, Coarsening of mass-selected Au clusters on amorphous carbon at room temperature, Surf. Sci. 2009, 603, 3119-3125

DOI: 10.1016/j.susc.2009.08.025

N. Bajales, S. Schmaus, T. Miyamashi, W. Wulfhekel, J. Wilhelm, M. Walz, M. Stendel, A. Bagrets, F. Evers, S. Ulas, B. Kern, A. Böttcher, M. Kappes, C58 on Au(111): A scanning tunneling microscopy study, J. Chem. Phys. 2013, 138, 104703

DOI: 10.1063/1.4793761

S. Ulas, J. Weippert, K. Amsharov, M. Jansen, M.L. Pop, M. V. Diudea, D. Strelnikov, A. Böttcher, M. Kappes, Thermal decomposition of the fullerene precursor C60H21F9 deposited on graphite, J. Phys. Chem. C2015, 119, 7308-7,18

DOI: 10.1021/acs.jpcc.5b00588

J. Weippert, J. Hauns, J. Bachmann, A. Böttcher, X. Yao, B. Yang, A. Narita, K. Müllen, M. Kappes, A TPD-based determination of the graphite interlayer cohesion energy, J. Chem. Phys. 2018, 149, 194701

DOI: 10.1063/1.5052728

J. Weippert, S. Ulas, D. Strelnikov, A. Böttcher, M. Kappes, Formation of sublimable nanographene oxides by reacting coronene films with atomic oxygen, J. Phys. Chem. C2018, 122, 28588-28600

DOI: 10.1021/acs.jpcc.8b01655

Prof. Dr. Barbara Lechner

C. Dri, M. Panighel, D. Tiemann, L. L. Patera, G. Troiano, Y. Fukamori, F. Knoller, B.A.J. Lechner, G. Cautero, D. Giuressi, G. Comelli, J. Fraxedas, C. Africh, and F. Esch, The new FAST module: A portable and transparent add-on module for time-resolved investigations with commercial scanning probe microscopes. Ultramicroscopy2019, 205, 49-56

DOI: 10.1016/j.ultramic.2019.05.010

C. Heine, B.A.J.Lechner, H. Bluhm, M. Salmeron, Recycling of CO2: Probing the chemical state of the Ni(111) surface during the methanation reaction with ambient pressure x-ray photoelectronspectroscopy. J. Am. Chem. Soc. 2016, 138, 13246-13252

DOI: 10.1021/jacs.6b06939

B. Zugic, L. Wang, C. Heine, D.N. Zakharov, B.A.J. Lechner, E.A. Stach, J. Biener, M. Salmeron, R.J. Madix, C.M. Friend, Dynamic Restructuring Drives Catalytic Activity on Nanoporous Gold-Silver Alloy Catalysts. Nat. Mater. 2017, 16, 558-564

DOI: 10.1038/nmat4824

B.A.J. Lechner, X. Feng, P.J. Feibelman, J.I. Cerdá, M. Salmeron, Scanning tunneling microscopy study of the structure and interaction between carbon monoxide and hydrogen on the Ru(0001) surface. J. Phys. Chem. B2017, 122, 649-656

DOI: 10.1021/acs.jpcb.7b05657

B.A.J. Lechner, F. Knoller, A. Bourgund, U. Heiz, F. Esch, A microscopy approach to investigating the energetics of small supported metal clusters. J. Phys. Chem. C2018, 122, 22569-22576

DOI: 10.1021/acs.jpcc.8b06866