Citation: Lü Jiao-Long, LI Feng-Li, LI Xin-Gang. NOx Storage Reduction Performance of Coupled BaFeO3-x+Cu-ZSM-5 Catalyst[J]. Acta Physico-Chimica Sinica, ;2014, 30(8): 1550-1558. doi: 10.3866/PKU.WHXB201406031
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A BaFeO3-x+Cu-ZSM-5 coupled catalyst was designed and synthesized to eliminate the NOx emitted from lean-burn exhausts, providing an alternative to the traditional noble-metal-based NOx storage reduction (NSR) catalysts. During the lean-burn period, the NO oxidation and storage processes mainly occurred over the BaFeO3-x catalyst. During the fuel-rich period, the released NOx from the BaFeO3-x catalyst was further reduced over the Cu-ZSM-5 catalyst. Our results show that, compared with the BaFeO3-x and Cu-ZSM-5 catalyst alone, the operating temperature window of the coupled BaFeO3-x+Cu-ZSM-5 catalyst is extended from 250 to 400 ℃, and its NOx elimination performance is significantly improved. The maximum NOx conversion of the coupled catalyst was 98%, while the N2 selectivity was close to 100%.
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Keywords:
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Lean-burn
, - Coupled catalyst,
- NOx,
- Storage,
- Reduction
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