XPS characterization of adsorbed reaction intermediates on automotive exhaust gas catalysts: NO and CO + NO interactions with Pd

• Published in: Surface and interface analysis Vol. 34; no. 1; pp. 105 - 111
• Main Authors: Mamede, A.-S., Leclercq, G., Payen, E., Granger, P., Gengembre, L., Grimblot, J.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Chichester, UK John Wiley & Sons, Ltd 01.08.2002; Wiley
• Subjects: Catalysis; Catalytic reactions; Chemistry; CO + NO reaction; Exact sciences and technology; General and physical chemistry; NO adsorption; Pd-based catalysts; Solid-gas interface; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; three-way catalytic converters; XPS; Reaction intermediate; Air pollution control; Catalytic reaction; Coadsorption; Palladium; Supported catalyst; Gas solid adsorption; Nitric oxide; Three way catalyst; Exhaust gas; Carbon monoxide; Alumina; X-ray photoelectron spectra
• ISSN: 0142-2421; 1096-9918
• DOI: 10.1002/sia.1263

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 PNO in the 0.5–5.0 (×10−2) atm range and PCO = 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.