La1-xSrxFeO3 perovskite-type oxides for chemical-looping steam methane reforming: Identification of the surface elements and redox cyclic performance

doi:10.1016/j.ijhydene.2019.03.002

GIEC OpenIR

	La1-xSrxFeO3 perovskite-type oxides for chemical-looping steam methane reforming: Identification of the surface elements and redox cyclic performance
	He, Fang1,2 ; Chen, Jing 2,3; Liu, Shuai 4; Huang, Zhen 2; Wei, Guoqiang 2; Wang, Guixia 1; Cao, Yan 4,5; Zhao, Kun2
	2019-04-23
发表期刊	INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
ISSN	0360-3199
卷号	44 期号:21 页码:10265-10276
通讯作者	He, Fang(hefang@glut.edu.cn) ; Zhao, Kun(zhaokun@ms.giec.ac.cn)
摘要	We report a family of perovskite-type oxides La1-xSrxFeO3 (x = 0.1, 0.3, 0.5, 0.7, 1.0) prepared by combustion method as effective redox catalysts for methane partial oxidation and thermochemical water splitting in a cyclic redox scheme. The effect of Sr-doping on the characterizations and properties of these perovskite-type oxides were studied by means of X-ray diffraction (XRD), hydrogen temperature-programmed reduction (H-2-TPR), X-ray photoelectron spectroscopy (XPS), and scanning electron microscope (SEM). All the as prepared and regenerated samples with various Sr substitutions exhibited pure crystalline perovskite structure. The oxygen carrying capacity of the La1-xSrxFeO3 perovskites was improved by doping Sr into the La-site. Besides, Sr-substitution has obvious effects on the valences of the Fe cations in the B-site and the oxygen species distribution of the La1-xSrxFeO3 perovskites. We recommend La0.7Sr0.3FeO3 as the optimal oxygen carrier in the series because it gives the maximum O-la/O-ad (O-la and O-ad stand for lattice oxygen and adsorbed oxygen species, respectively.) ratio of 3.64:1, which can be regarded as a criterion for the reactivity and selectivity of partial oxidation of methane into syngas of the oxygen carriers. Up to 80% CH4 conversion in the methane partial oxidation step and 96% of H-2 concentration in the water splitting step were achieved in ten successive redox tests conducted in a fixed bed reactor at 850 degrees C with La0.7Sr0.3FeO3 as a redox catalyst. The electronic properties of the original LaFeO3 cell and its lattice substituted by Sr were calculated based on the density functional theory method. Electronic structure analysis demonstrates that doping of Sr makes LaFeO3 more electric conductive and its electron is prone to be excited. This is in agreement with the test results that La0.7Sr0.3FeO3 exhibited better performance in chemical looping reactions. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
关键词	Perovskites Oxygen species XPS Chemical looping Methane reforming Water thermochemical splitting
DOI	10.1016/j.ijhydene.2019.03.002
关键词[WOS]	PARTIAL OXIDATION ; ABSORBED OXYGEN ; THIN-FILMS ; XPS ; HYDROGEN ; SYNGAS ; LAFE1-XCOXO3 ; COMBUSTION ; MECHANISM ; CATALYST
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2017YFE0105500] ; National Natural Science Foundation of China[51876205] ; National Natural Science Foundation of China[51776210] ; Guangxi Natural Science Foundation[2018JJD120017] ; R&D Project of Guilin University of Technology[GLUTQD2018027]
WOS研究方向	Chemistry ; Electrochemistry ; Energy & Fuels
项目资助者	National Key Research and Development Program of China ; National Natural Science Foundation of China ; Guangxi Natural Science Foundation ; R&D Project of Guilin University of Technology
WOS类目	Chemistry, Physical ; Electrochemistry ; Energy & Fuels
WOS记录号	WOS:000466618300012
出版者	PERGAMON-ELSEVIER SCIENCE LTD
引用统计	被引频次：58[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.giec.ac.cn/handle/344007/25020
专题	中国科学院广州能源研究所
通讯作者	He, Fang; Zhao, Kun
作者单位	1.Guilin Univ Technol, Coll Chem & Bioengn, Guilin 541004, Peoples R China 2.Chinese Acad Sci, Key Lab Renewable Energy, Guangdong Key Lab New & Renewable Energy Res & De, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China 3.Univ Sci & Technol China, Inst Nano Sci & Technol, Suzhou 215123, Peoples R China 4.Anhui Univ, Coll Chem & Chem Engn, Hefei 230601, Anhui, Peoples R China 5.Western Kentucky Univ, Dept Chem, Bowling Green, KY 42101 USA
推荐引用方式 GB/T 7714	He, Fang,Chen, Jing,Liu, Shuai,et al. La1-xSrxFeO3 perovskite-type oxides for chemical-looping steam methane reforming: Identification of the surface elements and redox cyclic performance[J]. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,2019,44(21):10265-10276.
APA	He, Fang.,Chen, Jing.,Liu, Shuai.,Huang, Zhen.,Wei, Guoqiang.,...&Zhao, Kun.(2019).La1-xSrxFeO3 perovskite-type oxides for chemical-looping steam methane reforming: Identification of the surface elements and redox cyclic performance.INTERNATIONAL JOURNAL OF HYDROGEN ENERGY,44(21),10265-10276.
MLA	He, Fang,et al."La1-xSrxFeO3 perovskite-type oxides for chemical-looping steam methane reforming: Identification of the surface elements and redox cyclic performance".INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 44.21(2019):10265-10276.