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XPS characterization of adsorbed reaction intermediates on automotive exhaust gas catalysts: NO and CO + NO interactions with Pd
Author(s) -
Mamede A.S.,
Leclercq G.,
Payen E.,
Granger P.,
Gengembre L.,
Grimblot J.
Publication year - 2002
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1263
Subject(s) - catalysis , x ray photoelectron spectroscopy , adsorption , chemistry , oxide , nitrogen , exhaust gas , nitrous oxide , nox , reaction mechanism , inorganic chemistry , chemical engineering , organic chemistry , combustion , engineering
Nitrous oxide (NO) adsorption and the CO + NO reaction have been investigated on bulk and alumina‐supported Pd catalysts by XPS at various temperatures between 25 and 300°C with P NO in the 0.5–5.0 (×10 −2 ) atm range and P CO = 5 × 10 −3 atm. A catalytic reactor settled in the preparation chamber coupled to the spectrometer allows surface changes occurring under catalytic conditions on these catalysts to be characterized. Various nitrogen‐containing species have been detected, which depend on the oxidation state of Pd. The results have been explained tentatively in the light of a mechanism proposed for NO transformation. Copyright © 2002 John Wiley & Sons, Ltd.