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This paper describes an expeditious and reliable method for determining the thermal effects\udin a static condition of commercial NOx storage catalysts (NSCs) using scanning electron microscopy\udwith an energy dispersive X-ray analytical system (SEM/EDS). It is worth remarking that possible\udchanges in the morphology and in the elemental composition of the catalyst may be considered as\udthe most important causes of the lower conversion of NOx. The information attained in this work\udindicates that Pt nanoparticle sintering is strongly increased by the oxygen exposure, and this can be\udconsidered a very useful preliminary investigation for the studies already present in the literature on\udthe efficiency of NSCs

Evaluating the NOx Storage Catalysts (NSC) Aging: A Preliminary Analytical Study with Electronic Microscopy