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. Sebastian Kunze

Mauricio Lopez Luna

Dr. See Woo Lee

Burkhard Kell

Uwe Härtel

Structure and Reactivity Research Group

Recent Publications

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, 6175-6185 (2021).
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 (2021).
Zhaorui Li, Kristin Werner, Lu Chen, Aiping Jia, Kun Qian, JianQiang Zhong, Rui You, Lihui Wu, Liyuan Zhang, Haibin Pan, Xin-Ping Wu, Xue-Qing Gong, Shamil K. Shaikhutdinov, Weixin Huang, and Hans-Joachim Freund, "Interaction of Hydrogen with Ceria: Hydroxylation, Reduction, and Hydride Formation on the Surface and in the Bulk," Chemistry – A European Journal 27 (16), 5268-5276 (2021).
JianQiang Zhong, Shamil K. Shaikhutdinov, and Beatriz Roldan Cuenya, "Structural Evolution of Ga–Cu Model Catalysts for CO2 Hydrogenation Reactions," The Journal of Physical Chemistry C 125 (2), 1361-1367 (2021).
Ke Zhang, Linfei Li, Jacek Goniakowski, Claudine Noguera, Hans-Joachim Freund, and Shamil K. Shaikhutdinov, "Size effect in two-dimensional oxide-on-metal catalysts of CO oxidation and its connection to oxygen bonding: An experimental and theoretical approach," Journal of Catalysis 393, 100-106 (2021).

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