A-site defects in LaSrMnO3 perovskite-based catalyst promoting NOx storage and reduction for lean-burn exhausts

doi:10.1016/j.jre.2020.04.015

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	A-site defects in LaSrMnO3 perovskite-based catalyst promoting NOx storage and reduction for lean-burn exhausts
	Zhao, Dongyue 2; Yang, Yuexi 2; Gao, Zhongnan 2; Tian, Ye 2; Zhang, Jing 1; Jiang, Zheng 3; Li, Xingang 2
刊名	Journal of Rare Earths
	2020
关键词	Strontium 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
ISSN号	1002-0721
DOI	10.1016/j.jre.2020.04.015
文献子类	期刊论文
英文摘要	Herein, 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
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/32711]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Institute of High Energy Physics, Chinese Academy of Sciences, Beijing; 100049, China; 2.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; 3.Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai; 201800, China
推荐引用方式 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).