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Negative Charging of Au Nanoparticles during Methanol Synthesis from CO₂/H₂ on a Au/ZnO Catalyst: Insights from Operando Infrared and Near‐ambient Pressure XPS and XAS

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Klyushin,  Alexander
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Helmholtz-Zentrum Berlin für Materialien und Energie, BESSY II;

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Knop-Gericke,  Axel
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Abdel-Mageed, A. M., Klyushin, A., Rezvani, A., Knop-Gericke, A., Schlögl, R., & Behm, R. J. (2019). Negative Charging of Au Nanoparticles during Methanol Synthesis from CO₂/H₂ on a Au/ZnO Catalyst: Insights from Operando Infrared and Near‐ambient Pressure XPS and XAS. Angewandte Chemie International Edition, 58(30), 10325-10329. doi:10.1002/anie.201900150.


Cite as: https://hdl.handle.net/21.11116/0000-0003-7552-D
Abstract
Kinetic measurements in combination with time resolved operando infrared (DRIFTS), in situ near ambient pressure X‐ray photoelectron spectroscopy (NAP‐XPS) and X‐ray absorption near edge spectroscopy (XANES) measurements at the O K‐edge together with high resolution electron microscopy were applied to evaluate the electronic and structural properties of Au/ZnO under industrial and idealized methanol synthesis conditions. CO adsorption during the reaction revealed the presence of negatively charged Au nanoparticles / Au sites under reaction conditions, which are formed during the initial phase of the reaction. Near ambient pressure XPS and XANES demonstrate the build‐up of O‐vacancies during the reaction, which goes along with a substantial increase in the methanol formation rate. The results are discussed in comparison with previous findings for Cu/ZnO and Au/ZnO catalysts.