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IR-Spectroscopic Study on the Interface of Cu-Based Methanol Synthesis Catalysts: Evidence for the Formation of a ZnO Overlayer

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Schumann,  Julia
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Chemical Engineering, Stanford University;
SLAC National Accelerator Laboratory, SUNCAT Center for Interface Science and Catalysis, 2575 Sand Hill Road ;

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Kröhnert,  Jutta
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Frei,  Elias
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Max Planck Institute for Chemical Energy Conversion ;

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Trunschke,  Annette
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Schumann, J., Kröhnert, J., Frei, E., Schlögl, R., & Trunschke, A. (2017). IR-Spectroscopic Study on the Interface of Cu-Based Methanol Synthesis Catalysts: Evidence for the Formation of a ZnO Overlayer. Topics in Catalysis, 60(19-20), 1735-1743. doi:10.1007/s11244-017-0850-9.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-FCB2-F
Abstract
Carbon monoxide was applied as probe molecule to compare the surface of a ZnO-containing (Cu/ZnO:Al) and a ZnO-free (Cu/MgO) methanol synthesis catalyst (copper content 70 atomic %) after reduction in hydrogen at 523 K by DRIFT spectroscopy. Nano-structured, mainly metallic copper was detected on the surface of the Cu/MgO catalyst. In contrast, the high energy of the main peak in the spectrum of CO adsorbed on reduced Cu/ZnO:Al (2125 cm−1) proves that metallic copper is largely absent on the surface of this catalyst. The band is assigned to Znδ+–CO. The presence of not completely reduced Cuδ+–CO species cannot be excluded. The results are interpreted in terms of a partial coverage of the copper nano-particles in the Cu/ZnO:Al catalyst by a thin layer of metastable, defective zinc oxide. Minor contributions in the spectrum at 2090 and 2112 cm−1 due to nano-structured Cu0–CO and CO adsorbed on highly defective Cu0, respectively, indicate that the coverage of metallic copper is not complete.