Journal
TOPICS IN CATALYSIS
Volume 42-43, Issue 1-4, Pages 37-41Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s11244-007-0147-5
Keywords
NOx storage catalysts; mechanism; infrared spectroscopy
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NOx storage mechanism over a model NSR catalyst has been analysed by means of in-situ FTIR. The results indicated that a two-step mechanism involving nitrite formation, without requirement of NO evolution to NO2, followed by oxidation to nitrate species, being both steps assisted by O-2, would describe the overall process at 350 degrees C. This mechanism could be also extended to a wider temperature range. The interaction between Pt and Ba sites was crucial in this mechanism, since spillover process of oxidising agents appeared to play a key role. NO2 direct interaction with BaO surface may also occur, but this process was only dominant on Ba sites away from Pt interaction.
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