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Effects of Fe dopants and residual carbonates on the catalytic activities of the perovskite-type La0.7Sr0.3Co1-xFexO3 NOx storage catalyst
Ma, AJ; Wang, SZ; Liu, C; Xian, H; Ding, Q; Guo, L; Meng, M; Tan, YS; Tsubaki, N; Zhang, J; Zheng, LR; Li, XG;张静; Zheng LR(郑黎荣)
2014
发表期刊APPLIED CATALYSIS B-ENVIRONMENTAL
卷号146期号:SI页码:24-34
摘要Herein, we reported the NOx storage capacity, NO oxidation ability and sulfur resistance of the La0.7Sr0.3CoO3-based perovskite-type catalysts. NO could be readily oxidized to NO2 with around 83% of NO-to-NO2 conversion at 300 degrees C over the perovskite. After sulfation, the NSC of the La0.7Sr0.3CoO3 catalyst calcined in static air decreased 58.0%. Nevertheless, a significant improvement of the sulfur tolerance could be achieved through partial substitution of Co with Fe cations, as well as calcination in flowing air. The NSC of the pre-sulfated La0.7Sr0.3Co0.8Fe0.2O3 catalyst maintained 360.7 mu mol/g and dropped only 6.4% as compared with the fresh one. The XPS results confirmed the presence of Fe-2(SO4)(3) in the sulfated La0.7Sr0.3Co0.8Fe0.2O3 catalyst. The EXAFS results further revealed that the formation of Fe-2(SO4)(3) in the perovskite inhibited the sulfation of neighboring strontium from the viewpoint of the local atomic level. These findings strongly suggest that the La0.7Sr0.3Co0.8Fe0.2O3 perovskite is a possible NOx absorber used for aftertreament systems upon lean-burn engines with the advantages of the excellent NO oxidation ability, NOx storage capacity and the high sulfur tolerance. (C) 2013 Elsevier B.V. All rights reserved.
关键词Perovskite Fe dopant Carbonates NOx storage Sulfur tolerance
学科领域Chemistry; Engineering
DOI10.1016/j.apcatb.2013.06.005
收录类别SCI
WOS记录号WOS:000327904000004
引用统计
被引频次:18[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224818
专题多学科研究中心
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Ma, AJ,Wang, SZ,Liu, C,et al. Effects of Fe dopants and residual carbonates on the catalytic activities of the perovskite-type La0.7Sr0.3Co1-xFexO3 NOx storage catalyst[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2014,146(SI):24-34.
APA Ma, AJ.,Wang, SZ.,Liu, C.,Xian, H.,Ding, Q.,...&郑黎荣.(2014).Effects of Fe dopants and residual carbonates on the catalytic activities of the perovskite-type La0.7Sr0.3Co1-xFexO3 NOx storage catalyst.APPLIED CATALYSIS B-ENVIRONMENTAL,146(SI),24-34.
MLA Ma, AJ,et al."Effects of Fe dopants and residual carbonates on the catalytic activities of the perovskite-type La0.7Sr0.3Co1-xFexO3 NOx storage catalyst".APPLIED CATALYSIS B-ENVIRONMENTAL 146.SI(2014):24-34.
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