Citation: WANG Shao-Zeng, ZOU Hong-Hu, MENG Ming, LI Zhi-Jun, BAO Jun, LI Xin-Gang. The Performance of the NO_x Storage Capacity and Sulfur Tolerance of the La_0.7Sr_0.3Co_1-xFe_xO₃ Catalyst[J]. Acta Physico-Chimica Sinica, ;2012, 28(06): 1474-1480. doi: 10.3866/PKU.WHXB201203311 shu

The Performance of the NO_x Storage Capacity and Sulfur Tolerance of the La_0.7Sr_0.3Co_1-xFe_xO₃ Catalyst

¹ ,
WANG Shao-Zeng ¹ ,
ZOU Hong-Hu ¹ ,
MENG Ming ¹ ,
LI Zhi-Jun ² ,
BAO Jun ³ ,
LI Xin-Gang ^1,

1.
1. Tianjin Key Laboratory of Applied Catalysis Science & Technology, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, P. R. China;
2. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, P. R. China;
3. National Synchrotron Radiation Laboratory, University of Science & Technology of China, Hefei 230029, P. R. China

Received Date: 16 January 2012
Available Online: 31 March 2012
Fund Project: 国家自然科学基金(20806056, U1162103) (20806056, U1162103) 国家高技术研究发展计划(863 计划) (2008AA06Z323) (863 计划) (2008AA06Z323) 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) 教育部留学归国人员科研启动基金(2011-1568)以及天津大学内燃机燃烧学国家重点实验室开放基金(K2012-05)资助项目 (2011-1568)以及天津大学内燃机燃烧学国家重点实验室开放基金(K2012-05)

In this paper, a series of La_0.7Sr_0.3Co_1-xFe_xO₃ (x=0, 0.2, 0.6, and 1.0) catalysts was synthesized by a sol-gel method with calcination at 700 °C in static air. The effect of the Fe doping on the structure, the performance of the NO_x storage, sulfur tolerance and regeneration of the perovskite catalysts was investigated. Our results showed that the partial substitution of Co with Fe improved the depersion of the SrCO₃ phase, and that the perovskite phase became the only species detected from the X-ray diffraction (XRD) patterns. The NO_x storage capacity (NSC) of the catalysts dropped following an increase in the proportion of Fe doping. The deposition of sulfate on the surface and the partial structural damage of the La_0.7Sr_0.3CoO₃ catalyst led to a dramatic reduction in the NSC and the NO oxidation capacity after the sulfation treatment: the NSC being reduced by 64.2%, and the conversion of NO-to-NO₂ falling to 43.4% from 72.8%. The sulfur tolerance of the perovskite catalyst, however, was improved after doping with Fe at the B sites of the La_0.7Sr_0.3CoO₃ catalyst. Of all of these catalysts, the perovskite with 60% of Fe doping (the Fe60 sample) gave the best performance for sulfur tolerane properties and regeneration ability. The NSC of the Fe60 sample was reduced by only 16.6%, and the NO-to-NO₂ conversion reached the value almost similar to that of the fresh sample (i.e. 69.1%).
- Lean-burn,
- NO_x,
- Storage,
- Perovskite,
- Sulfur tolerance,
- Regeneration,
- La_0.7Sr_0.3Co_1-xFe_xO₃
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The Performance of the NOx Storage Capacity and Sulfur Tolerance of the La0.7Sr0.3Co1-xFexO3 Catalyst

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The Performance of the NO_x Storage Capacity and Sulfur Tolerance of the La_0.7Sr_0.3Co_1-xFe_xO₃ Catalyst