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A-site defects in LaSrMnO3 perovskite-based catalyst promoting NOx storage and reduction for lean-burn exhausts
Zhao, Dongyue1; Yang, Yuexi1; Gao, Zhongnan1; Tian, Ye1; Zhang, Jing2; Jiang, Zheng3; Li, Xingang1
2020
Source PublicationJournal of Rare Earths
ISSN1002-0721
Subtype期刊论文
AbstractHerein, we report the high De-NOx performance of the A-site defective perovskite-based Pd/La0.5Sr0.3MnO3 catalyst. The formation of the defective perovskite structure can be proved by both the increased Mn4+/Mn3+ ratio and serious lattice contraction due to cationic nonstoichiometry. It promotes the Sr doping into perovskite lattice and reduces the formation of the SrCO3 phase. Our results demonstrate that below 300 °C the A-site defective perovskite can be more efficiently regenerated than the SrCO3 phase as NOx storage sites due to the latter's stronger basicity, and also exhibits the higher NO oxidation ability than the A-site stoichiometric and excessive catalysts. Both factors promote the low-temperature De-NOx activity of the Pd/La0.5Sr0.3MnO3 catalyst through improving its NOx trapping efficiency. Nevertheless, above 300 °C, the NOx reduction becomes the determinant of the De-NOx activity of the perovskite-based catalysts. A-site defects can weaken the interactions between perovskite and Pd, inducing activation of Pd sites by in-situ transformation from PdO to metallic Pd in the alternative lean-burn/fuel-rich atmospheric alternations, which boosts the De-NOx activity of the Pd/La0.5Sr0.3MnO3 catalyst. The Pd/La0.5Sr0.3MnO3 catalyst exhibits the high sulfur tolerance as well. These findings provide insight into optimizing the structural properties and catalytic activities of the perovskite-based catalysts via tuning formulation, and have potential to be applied for various related catalyst systems. © 2020 Chinese Society of Rare Earths
KeywordStrontium compounds Catalyst activity Defects Lanthanum compounds Manganese compounds Nitrogen oxides Palladium Perovskite Temperature Cationic nonstoichiometry Lattice contraction Low temperatures NOx storage and reduction Perovskite lattice Perovskite structures Situ transformation Trapping efficiencies
DOI10.1016/j.jre.2020.04.015
Indexed ByEI
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/32711
Collection中科院上海应用物理研究所2011-2020年
Affiliation1.Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), State Key Laboratory of Chemical Engineering, Tianjin Key Laboratory of Applied Catalysis Science and Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin; 300072, China;
2.Institute of High Energy Physics, Chinese Academy of Sciences, Beijing; 100049, China;
3.Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai; 201800, China
Recommended Citation
GB/T 7714
Zhao, Dongyue,Yang, Yuexi,Gao, Zhongnan,et al. A-site defects in LaSrMnO3 perovskite-based catalyst promoting NOx storage and reduction for lean-burn exhausts[J]. Journal of Rare Earths,2020.
APA Zhao, Dongyue.,Yang, Yuexi.,Gao, Zhongnan.,Tian, Ye.,Zhang, Jing.,...&Li, Xingang.(2020).A-site defects in LaSrMnO3 perovskite-based catalyst promoting NOx storage and reduction for lean-burn exhausts.Journal of Rare Earths.
MLA Zhao, Dongyue,et al."A-site defects in LaSrMnO3 perovskite-based catalyst promoting NOx storage and reduction for lean-burn exhausts".Journal of Rare Earths (2020).
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