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Fundamental Aspects of Ceria Supported Au Catalysts Probed by In Situ/Operando Spectroscopy and TAP Reactor Studies
Author(s) -
AbdelMageed Ali M.,
Chen Shilong,
Fauth Corinna,
Häring Thomas,
Bansmann Joachim
Publication year - 2021
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.202100027
Subject(s) - catalysis , raman spectroscopy , reactivity (psychology) , spectroscopy , redox , nanoparticle , in situ , x ray absorption spectroscopy , absorption spectroscopy , fourier transform infrared spectroscopy , chemistry , heterogeneous catalysis , diffuse reflectance infrared fourier transform , photochemistry , reaction mechanism , oxidation state , chemical engineering , nanotechnology , materials science , inorganic chemistry , photocatalysis , organic chemistry , medicine , physics , alternative medicine , engineering , pathology , quantum mechanics , optics
The discovery of the activity of dispersed gold nanoparticles three decades ago paved the way for a new era in catalysis. The unusual behavior of these catalysts sparked many questions about their working mechanism. In particular, Au/CeO 2 proved to be an efficient catalyst in several reactions such as CO oxidation, water gas shift, and CO 2 reduction. Here, by employing findings from operando X‐ray absorption spectroscopy at the near and extended Au and Ce L III energy edges, we focus on the fundamental aspects of highly active Au/CeO 2 catalysts, mainly in the CO oxidation for understanding their complex structure‐reactivity relationship. These results were combined with findings from in situ diffuse reflectance FTIR and Raman spectroscopy, highlighting the changes of adlayer and ceria defects. For a comprehensive understanding, the spectroscopic findings will be supplemented by results of the dynamics of O 2 activation obtained from Temporal Analysis of Products (TAP). Merging these results illuminates the complex relationship among the oxidation state, size of the Au nanoparticles, the redox properties of CeO 2 support, and the dynamics of O 2 activation.