Citation: XIAN Hui, MA Ai-Jing, MENG Ming, LI Xin-Gang. Influence of Reductants on the NO_x Storage Performances of the La_0.7Sr_0.3Co_0.8Fe_0.2O₃ Perovskite-Type Catalyst[J]. Acta Physico-Chimica Sinica, ;2013, 29(11): 2437-2443. doi: 10.3866/PKU.WHXB201309052 shu

Influence of Reductants on the NO_x Storage Performances of the La_0.7Sr_0.3Co_0.8Fe_0.2O₃ Perovskite-Type Catalyst

XIAN Hui ^1,2 ,
MA Ai-Jing ¹ ,
MENG Ming ^1,3 ,
LI Xin-Gang ^1,3,

1.
1 Tianjin Key Laboratory of Applied Catalysis Science & Technology, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072;
2 Pei-Yang Distillation Engineering Limited Company, Tianjin 300457;
3 The Synergistic Innovation Center of Chemistry and Chemical Engineering of Tianjin, Tianjin 300072

Received Date: 3 July 2013
Available Online: 5 September 2013
Fund Project: 国家自然科学基金(U1232118,) (U1232118,)天津市自然科学基金(11JCYBJC03700) (11JCYBJC03700)教育部新世纪优秀人才支持计划(NCET-10-0615) (NCET-10-0615)

A La_0.7Sr_0.3Co_0.8Fe_0.2O₃ perovskite-type catalyst was synthesized by a sol-gel method. The influence of different reductants (CO, C₃H₆, and H₂) on the NO_x storage capacity and NO-to-NO₂ conversion of the perovskite was evaluated before and after the NO_x storage-reduction (NSR) tests. Our O₂temperature programmed desorption findings showed that a large number of oxygen vacancies were generated in the COreduced perovskite. These oxygen vacancies are effective sites for NO_x storage. The catalytic tests and Fourier transform infrared (FTIR) spectroscopy results showed that during the NSRtests of catalysts that used CO as the reductant, the catalysts demonstrated excellent NO_x storage performance. Further investigations revealed the generation of a new Sr₃Fe₂O₇ phase in the catalyst. This new phase may possess better NO_x storage ability than the La_0.7Sr_0.3Co_0.8Fe_0.2O₃ perovskite. In conclusion, the NO_x storage ability of the catalyst was greatly improved after reduction by CO due to an increase in oxygen vacancies and the generation of a Sr₃Fe₂O₇ phase during NSR cycling.
- Lean-burn,
- Perovskite,
- NO_x,
- Storage,
- Reduction,
- Reductant
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Influence of Reductants on the NOx Storage Performances of the La0.7Sr0.3Co0.8Fe0.2O3 Perovskite-Type Catalyst

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通讯作者: 陈斌, bchen63@163.com

Influence of Reductants on the NO_x Storage Performances of the La_0.7Sr_0.3Co_0.8Fe_0.2O₃ Perovskite-Type Catalyst