Effects of Co-substitution on the reactivity of double perovskite oxides LaSrFe2-xCoxO6 for the chemical-looping steam methane reforming

doi:10.1016/j.joei.2018.03.013

	Effects of Co-substitution on the reactivity of double perovskite oxides LaSrFe2-xCoxO6 for the chemical-looping steam methane reforming
	Zhao, Kun 1,2,3,4; Chen, Jing 1,2,3,5; Li, Haibin 1,2,3; Zheng, Anqing 1,2,3; He, Fang 1,2,3
刊名	JOURNAL OF THE ENERGY INSTITUTE
	2019-06-01
卷号	92 期号:3 页码:594-603
关键词	Chemical looping Methane reforming Double perovskite Synergistic effect Oxygen vacancy
ISSN号	1743-9671
DOI	10.1016/j.joei.2018.03.013
通讯作者	Zheng, Anqing(zhengaq@ms.giec.ac.cn) ; He, Fang(hefang@ms.giec.ac.cn)
英文摘要	The double perovskite oxides (DPOs) LaSrFe2-xCoxO6 (x = 0, 0.2, 0.4, 0.6, 0.8) were investigated as oxygen carriers for the chemical looping steam methane reforming (CL-SMR). The fresh oxides were prepared by micro-emulsion method and their physical and chemical properties were characterized by X-ray diffraction, H2-temperature programmed reduction and X-ray photoelectron spectroscopy technologies. Meanwhile, isothermal reactions for methane reforming and steam splitting were carried out in a fixed-bed reactor to determine the influences of Co-substitution on the reactivity of LaSrFe2-xCoxO6. The substitution of metal Co has no obvious effect on the crystal structure of double perovskite, but induces a certain degree of Fe/Co disorder generating oxygen vacancies and/or higher oxidation states of metal cations. Synergistic interaction between surface metal ions, such as (Fe4+/Fe5+-O2--Co2+) and (Fe3+-O2--Co3+), plays a positive effect for the dissociation of methane. The activity may be more likely to be associated with the active oxygen species in connection with Co species on the DPOs surface and abundant of syngas was generated due to the concordant of methane dissociation with the lattice oxygen diffusion. Comprehensively considered, an optimal range of the degree of Co substitution is x = 0.4-0.6 for LaSrFe2-xCoxO6, probably converting 70% of CH4 into CO and H-2 with molar ratio around 2:1. At the reduced states, the ability of DPOs for steam splitting is primarily associated with the oxygen vacancies after oxygen consumption. The substitution of metal Co slightly enhances the hydrogen production capacity and resistance to carbon formation, achieving the average hydrogen yields at 2.89-3.33 mmol/g oxygen carrier and 1.46-1.61 wt% of carbon depositions. (C) 2018 Energy Institute. Published by Elsevier Ltd. All rights reserved.
资助项目	National Natural Science Foundation of China[51406208] ; National Natural Science Foundation of China[51406214] ; Science & Technology Research Project of Guangdong Province[2015A010106009]
WOS关键词	OXYGEN CARRIER ; HYDROGEN-PRODUCTION ; PARTIAL OXIDATION ; MIXED OXIDES ; PERFORMANCE ; REDUCTION ; GAS ; CATALYST ; COMBUSTION ; STABILITY
WOS研究方向	Energy & Fuels
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000469152800018
资助机构	National Natural Science Foundation of China ; Science & Technology Research Project of Guangdong Province
内容类型	期刊论文
源URL	[http://ir.giec.ac.cn/handle/344007/25133]
专题	中国科学院广州能源研究所
通讯作者	Zheng, Anqing; He, Fang
作者单位	1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou, Guangdong, Peoples R China 2.CAS Key Lab Renewable Energy, Beijing, Peoples R China 3.Guangdong Prov Key Lab New & Renewable Energy Res, Guangzhou, Guangdong, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.Univ Sci & Technol China, Nano Sci & Technol Inst, Suzhou 215123, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Kun,Chen, Jing,Li, Haibin,et al. Effects of Co-substitution on the reactivity of double perovskite oxides LaSrFe2-xCoxO6 for the chemical-looping steam methane reforming[J]. JOURNAL OF THE ENERGY INSTITUTE,2019,92(3):594-603.
APA	Zhao, Kun,Chen, Jing,Li, Haibin,Zheng, Anqing,&He, Fang.(2019).Effects of Co-substitution on the reactivity of double perovskite oxides LaSrFe2-xCoxO6 for the chemical-looping steam methane reforming.JOURNAL OF THE ENERGY INSTITUTE,92(3),594-603.
MLA	Zhao, Kun,et al."Effects of Co-substitution on the reactivity of double perovskite oxides LaSrFe2-xCoxO6 for the chemical-looping steam methane reforming".JOURNAL OF THE ENERGY INSTITUTE 92.3(2019):594-603.