Abstract
A highly active CaMnO3 perovskite catalyst (CMO-H) was fabricated for NO oxidation, a key reaction in the control of NOx emissions from mobile and stationary sources, by tuning the average oxidation state of Mn on the surface via acid-initiated Mn disproportionation. In-depth structure-performance investigations suggest that an increased abundance of surface Mn4+ on CMO-H is responsible for its high activity. Doping with a tiny amount of Pd promoted the formation of reactive oxygen species on the CMO-H surface, leading to a further increase of NO oxidation activity which was largely sustained even in the presence of CO and hydrocarbons. Strikingly, an increased SO2-resistance was achieved over the Pd-doped CMO-H, due to an alleviation of surface sulfate formation by Pd. Our study sheds new lights on the rational fabrication of active, poisoning-resistant and cost-effective oxide catalysts for NO oxidation, which is an important reaction in various environmental and industrial applications.
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