碱土元素掺杂的BaFeO3钙钛矿型催化剂的NOx储存性能

doi:10.3866/PKU.WHXB201212241

Abstract

Abstract:

A series of Ba_1-xM_xFeO₃ (M=Mg, Ca, Sr; x=0, 0.1, 0.2) perovskites were prepared by the sol-gel method as NO_x storage reduction (NSR) catalysts. The effect of doping with alkaline earth metals (Mg, Ca, and Sr) on the NO_x storage and oxidation performance of the BaFeO₃ perovskites was investigated. Doping with Mg enhanced the NO_x storage capacity (NSC) of the BaFeO₃ perovskites in the temperature range 250-400 ℃, the Ba_0.8Mg_0.2FeO₃ perovskite exhibited the best NO_x 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 Ba_0.8Mg_0.2FeO₃ sample after storing NO_x at 250 ℃. The amount of the monodentate nitrate on Ba_0.8Mg_0.2FeO₃ varied with the NO_x 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 NO_x adsorption. Moreover, the residual MgO on the catalyst might also improve the NSC of the sample by forming the monodentate nitrate.

Key words: Perovskite, Alkaline-earth metal doping, NO_x storage, NO oxidation, Lean-burn

LI Feng-Li, GUO Li, XIAN Hui, MENG Ming, LI Zhi-Jun, BAO Jun, LI Xin-Gang. NO_x Storage Performance of Alkaline Earth-Doped Perovskite-Type BaFeO₃ Catalysts[J].Acta Phys. -Chim. Sin., 2013, 29(03): 605-611.

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NO_x Storage Performance of Alkaline Earth-Doped Perovskite-Type BaFeO₃ Catalysts

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NO_x Storage Performance of Alkaline Earth-Doped Perovskite-Type BaFeO₃ Catalysts