Citation: LI Feng-Li, GUO Li, XIAN Hui, MENG Ming, LI Zhi-Jun, BAO Jun, LI Xin-Gang. NOx Storage Performance of Alkaline Earth-Doped Perovskite-Type BaFeO3 Catalysts[J]. Acta Physico-Chimica Sinica, ;2013, 29(03): 605-611. doi: 10.3866/PKU.WHXB201212241
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A series of Ba1-xMxFeO3 (M=Mg, Ca, Sr; x=0, 0.1, 0.2) perovskites were prepared by the sol-gel method as NOx storage reduction (NSR) catalysts. The effect of doping with alkaline earth metals (Mg, Ca, and Sr) on the NOx storage and oxidation performance of the BaFeO3 perovskites was investigated. Doping with Mg enhanced the NOx storage capacity (NSC) of the BaFeO3 perovskites in the temperature range 250-400 ℃, the Ba0.8Mg0.2FeO3 perovskite exhibited the best NOx storage performance, which reached its maximum at 350 ℃, with NSC>1200 μmol·g-1 and the NO→NO2 conversion of 53.4%. Compared with BaFeO3, the monodentate nitrate appeared clearly for the Ba0.8Mg0.2FeO3 sample after storing NOx at 250 ℃. The amount of the monodentate nitrate on Ba0.8Mg0.2FeO3 varied with the NOx storage temperature in a similar manner to that of its NSC. Fourier transform infrared (FTIR) spectra indicated that doping with Mg induced an A-site deficient perovskite structure in BaFeO3, which readily generates oxygen vacancies that act as the active sites for NOx adsorption. Moreover, the residual M on the catalyst might also improve the NSC of the sample by forming the monodentate nitrate.
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Keywords:
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Perovskite
, - Alkaline-earth metal doping,
- NOx storage,
- NO oxidation,
- Lean-burn
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