Structure and Reactivity

Structure and Reactivity

We study surface chemistry of oxide-supported metal and transition metal oxide nanoparticles focusing on the effect of the particle size, shape and the nature of oxide support on reactivity, particularly in CO2 hydrogenation reactions.

Mono- and multi-component particles, prepared for example by colloidal chemistry methods, are deposited onto planar oxide supports by dip coating, followed by oxygen plasma ligand removal and calcination-reduction treatments. In addition, metallic particles can be prepared by physical vapor deposition in vacuum.

In several UHV setups, we use a variety of surface science techniques such as scanning probe microscopy (SPM), Auger electron spectroscopy (AES), ultraviolet photoelectron spectroscopy (UPS), low energy ion scattering (LEIS), temperature programmed desorption (TPD), infrared reflection absorption spectroscopy (IRAS) (also in polarization-modulation mode, PM-IRAS), and X-ray photoelectron spectroscopy (XPS) in UHV as well as at near atmospheric pressures (NAP-XPS). In addition, the elementary steps of reactions are addressed by molecular beam (MB) studies in combination with IRAS. The catalytic activity of model planar catalysts under both, UHV-compatible and realistic conditions can be monitored by a gas chromatography and mass-spectrometry. The results on model catalysts are compared to the “real” systems prepared on high surface area supports to rationalize the structure-reactivity relationships.

Group Members

Dr. Jingyi Yang

David Kordus

Dr. Jie Zhu

Mauricio Lopez Luna

Van Canh Nguyen Uwe H.

Recent Publications

Mauricio Prieto, Thomas Mullan, Weiming Wan, Liviu Cristian Tanase, Lucas de Souza Caldas, Shamil K. Shaikhutdinov, Joachim Sauer, Denis Usvyat, Thomas Schmidt, and Beatriz Roldan Cuenya, "Plasma Functionalization of Silica Bilayer Polymorphs," ACS Applied Materials and Interfaces 14 (43), 48609-48618 (2022).
Nina F. Richter, Hendrik Ronneburg, Peter M. Clawin, Noah Subat, Felix E. Feiten, Jagriti Pal, Emre Emmez, Shamil K. Shaikhutdinov, Helmut Kuhlenbeck, Thomas Risse, and Hans-Joachim Freund, "Electron-Stimulated Hydroxylation of Silica Bilayer Films Grown on Ru(0001): A Combined HREELS and EPR Study," The Journal of Physical Chemistry C 126 (18), 7956-7964 (2022).
Weiming Wan, Julian Geiger, Nikolay Berdunov, Mauricio Lopez-Luna, See Wee Chee, Nathan Daelman, Núria López, Shamil K. Shaikhutdinov, and Beatriz Roldan Cuenya, "Highly Stable and Reactive Platinum Single Atoms on Oxygen Plasma-Functionalized CeO2 Surfaces: Nanostructuring and Peroxo Effects," Angewandte Chemie International Edition 61 (20), e202112640 (2022).
Jan Seifert, Spencer Carey, S. Schauermann, Shamil K. Shaikhutdinov, and Hans-Joachim Freund, "Water and Carbon Dioxide Adsorption on CaO(001) Studied via Single Crystal Adsorption Calorimetry," Topics in Catalysis 64 (17-20), 1030-1040 (2021).
Mauricio Lopez-Luna, Janis Timoshenko, David Kordus, Clara Rettenmaier, See Wee Chee, Adam S. Hoffman, Simon R. Bare, Shamil K. Shaikhutdinov, and Beatriz Roldan Cuenya, "Role of the Oxide Support on the Structural and Chemical Evolution of Fe Catalysts during the Hydrogenation of CO2," ACS Catalysis 11 (10), 6175-6185 (2021).

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