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

Autor:	Alexander Yu. Klyushin, Robert Schlögl, Ali M. Abdel-Mageed, Axel Knop-Gericke, Azita Rezvani, R. Jürgen Behm
Rok vydání:	2019
Předmět:	X-ray absorption spectroscopy Materials science 010405 organic chemistry Analytical chemistry Nanoparticle General Chemistry 010402 general chemistry 01 natural sciences Catalysis XANES 0104 chemical sciences Adsorption X-ray photoelectron spectroscopy Spectroscopy Ambient pressure
Zdroj:	Angewandte Chemie International Edition. 58:10325-10329
ISSN:	1521-3773 1433-7851
DOI:	10.1002/anie.201900150
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::096fc649190880513d92cf12aac62535 https://doi.org/10.1002/anie.201900150 Zobrazit plný text záznamu Plný text