DOI: 10.1016/j.jcou.2019.02.013
Scopus记录号: 2-s2.0-85062715320
论文题名: Chemical insights on the activity of La 1-x Sr x FeO 3 perovskites for chemical looping reforming of methane coupled with CO 2 -splitting
作者: Sastre D. ; Serrano D.P. ; Pizarro P. ; Coronado J.M.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2019
卷: 31 起始页码: 16
结束页码: 26
语种: 英语
英文关键词: Boudouard reaction
; CH 4 decomposition
; Chemical looping
; CO 2 -splitting
; Redox perovskites
; Solar fuels
; Syngas
Scopus关键词: Carbon dioxide
; Carbon footprint
; High temperature effects
; Iron compounds
; Lanthanum compounds
; Metals
; Methane
; Oxidation
; Perovskite
; Reforming reactions
; Synthesis gas
; Boudouard reaction
; Chemical looping
; CO2-splitting
; Solar fuels
; Syn-gas
; Strontium compounds
英文摘要: Coupling Chemical Looping Reforming of methane with CO 2 -splitting reactions represents an attractive route to achieve continuous syngas and CO productivities with reduced carbon footprint in a cyclic two-steps process. Both reactions are performed in the presence of a metal oxide, which switches from reduced to oxidized in successive stages. In this work, La 1-x Sr x FeO 3 perovskites were selected, because the Sr/La ratio can be varied to tune the redox capacity of the system. Reactivity of these materials were tested in isothermal cycles at 850 °C with the aim of simultaneously maximize the conversion of CH 4 and ensure the re-oxidation of the solid. Although the highest redox capacity is observed for the material with higher Sr-content (x = 0.9), the best performance is obtained for La 0.9 Sr 0.1 FeO 3 , which exhibits notable overall syngas yields per cycle: 12.8 mmol H 2 g -1 and 15.9 mmol CO g -1 . Analyses of the reactivity of these perovskites reveal the important contribution of both methane cracking and Boudouard reaction on the production of syngas, particularly for materials with low Sr/La ratio. These two processes operate, respectively, in the reduction and oxidation stages, in such a way that a significant deactivation of the perovskites by carbon deposition is avoided. These findings highlight the influence of aspects other than redox properties on the high temperature reactivity of La 1-x Sr x FeO 3 perovskites in cycles alternating CH 4 and CO 2 . On the other hand, materials with high La/Sr ratio experienced significant changes in the phase composition after prolonged reduction in CH 4 . Nevertheless, these transformations are reversible and, after re-oxidation, the recovered perovskite remains highly active, emphasizing the stability of these reactive solids. © 2019 Elsevier Ltd. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117279
Appears in Collections: 气候变化与战略
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Recommended Citation:
Sastre D.,Serrano D.P.,Pizarro P.,et al. Chemical insights on the activity of La 1-x Sr x FeO 3 perovskites for chemical looping reforming of methane coupled with CO 2 -splitting[J]. Journal of CO2 Utilization,2019-01-01,31