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NO x 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 NO 2 , followed by oxidation to nitrate species, being both steps assisted by O 2 , would describe the overall process at 350°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. NO 2 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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