Mixed-Phase Oxide Catalyst Based on Mn-Mullite (Sm, Gd)Mn₂O₅ for NO Oxidation in Diesel Exhaust
2012
Wang, Weichao | McCool, Geoffrey | Kapur, Neeti | Yuan, Guang | Shan, Bin | Nguyen, Matt | Graham, Uschi M. | Davis, Burtron H. | Jacobs, Gary | Cho, Kyeongjae | Hao, Xianghong (Kelly)
Cleaning Diesel Exhaust One strategy for removing pollutants from diesel engine exhaust is to trap the unburned carbon soot and then to combust the soot with the NO ₂ that is generated from NO; the two pollutants are then converted to N ₂ and CO ₂. Diesel exhaust is relatively cold, compared to gasoline engine exhaust, and conversion of NO to NO ₂ has required the use of platinum catalysts. W. Wang et al. (p. 832) now report that a more earth-abundant catalyst, based on Mn-mullite (Sm, Gd)Mn ₂O ₅ metal oxides was able to oxidize NO in simulated diesel exhaust at temperatures as low as 75°C. Spectroscopic studies and quantum chemical modeling suggested that Mn-nitrates formed on Mn-Mn dimer sites were the key intermediates responsible for NO ₂ formation.
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