Abstract
Mnx–Sny–Ce1−x−y–O2±μ (denoted Mn–Sn–Ce–O) catalysts prepared through co-precipitation were used for NOX storage under lean conditions at a low temperature (100°C). The NOX storage capacity (NSC) of the Mn–Sn–O dramatically increased after incorporating Ce. The catalyst, which has a 4:5:1 molar ratio of Mn:Sn:Ce (denoted Mn0.4Sn0.5Ce0.1), exhibited a breakthrough time of 16min and a NSC of 565.9μmolg−1 at a gas hourly space velocity (GHSV) of 48,000mLh−1g−1. Combining the NO adsorption/desorption results with XPS and H2-TPR, results revealed that the NO oxidation ability of Mn–Sn–Ce–O had improved dramatically due to the Sn–Ce interactions and the surface defect oxygen species. Furthermore, the NO-TPD, NO2-TPD and in situ DRIFTS data indicated that incorporate Ce into the Mn–Sn–O induced a synergistic Sn–Ce effect during NOX storage, thereby producing more NO2 adsorption sites on the surface.
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