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In‐situ XAS Study of Catalytic N 2 O Decomposition Over CuO/CeO 2 Catalysts
Author(s) -
Zabilskiy Maxim,
Arčon Iztok,
Djinović Petar,
Tchernychova Elena,
Pintar Albin
Publication year - 2021
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202001829
Subject(s) - xanes , extended x ray absorption fine structure , x ray absorption spectroscopy , catalysis , copper , ionic bonding , decomposition , inorganic chemistry , oxide , chemistry , oxidation state , materials science , analytical chemistry (journal) , absorption spectroscopy , ion , spectral line , metallurgy , biochemistry , physics , organic chemistry , chromatography , quantum mechanics , astronomy
Abstract We performed in‐situ XAS study of N 2 O decomposition over CuO/CeO 2 catalysts. The Cu K‐edge and Ce L 3 ‐edge XANES and EXAFS analyses revealed the dynamic and crucial role of Cu 2+ /Cu + and Ce 4+ /Ce 3+ ionic pairs during the catalytic reaction. We observed the initial formation of reduced Cu + and Ce 3+ species during activation in helium atmosphere at 400 °C, while concentration of these species decreased significantly during steady‐state nitrous oxide degradation reaction (2500 ppm N 2 O in He at 400 °C). In‐situ EXAFS analysis further revealed a crucial role of copper−ceria interface in this catalytic reaction. We observed dynamic changes in average number of Cu−Ce scatters under reaction conditions, indicating an enlarging of the interface between both copper and ceria phases, where electron and oxygen transfer occurs.