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Negative Charging of Au Nanoparticles during Methanol Synthesis from CO 2 /H 2 on a Au/ZnO Catalyst: Insights from Operando IR and Near‐Ambient‐Pressure XPS and XAS Measurements
Author(s) -
AbdelMageed Ali M.,
Klyushin Alexander,
Rezvani Azita,
KnopGericke Axel,
Schlögl Robert,
Behm R. Jürgen
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201900150
Subject(s) - x ray photoelectron spectroscopy , xanes , catalysis , ambient pressure , nanoparticle , methanol , adsorption , materials science , analytical chemistry (journal) , spectroscopy , absorption (acoustics) , chemistry , chemical engineering , nanotechnology , biochemistry , physics , organic chemistry , chromatography , quantum mechanics , engineering , composite material , thermodynamics
The electronic and structural properties of Au/ZnO under industrial and idealized methanol synthesis conditions have been investigated. This was achieved by kinetic measurements in combination with time‐resolved operando infrared (DRIFTS) as well as 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. The adsorption of CO during the reaction revealed the presence of negatively charged Au nanoparticles/Au sites 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 rate of methanol formation. The results are discussed in comparison with previous findings for Cu/ZnO and Au/ZnO catalysts.