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. Weiming Wan

David Kordus

Dr. Jian Qiang Zhong

Mauricio Lopez Luna

Uwe Härtel

Burkhard Kell

Structure and Reactivity Research Group

Recent Publications

Hans-Joachim Freund, Markus Heyde, Helmut Kuhlenbeck, Niklas Nilius, Thomas Risse, Thomas Schmidt, Shamil K. Shaikhutdinov, and Martin Sterrer, "Chapter model systems in heterogeneous catalysis at the atomic level: a personal view," Science China Chemistry 63 (4), 426-447 (2020).
Zhaorui Li, Kristin Werner, Kun Qian, Rui You, Agata Plucienik, Aiping Jia, Lihui Wu, Liyuan Zhang, Haibin Pan, Helmut Kuhlenbeck, Shamil K. Shaikhutdinov, Weixin Huang, and Hans-Joachim Freund, "Oxidation of Reduced Ceria by Incorporation of Hydrogen," Angewandte Chemie International Edition 58 (41), 14686-14693 (2019).
E. Sorek, J. Ankri, G. Arbiv, R. Mol, I. Popov, Hans-Joachim Freund, Shamil K. Shaikhutdinov, and M. Asscher, "Acetylene Reactivity on Pd-Cu Nanoparticles Supported on Thin Silica Films: The Role of the Underlying Substrate," The Journal of Physical Chemistry C 123 (28), 17425-17431 (2019).

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