DOI: 10.1016/j.jcou.2016.05.006
Scopus记录号: 2-s2.0-84971283830
论文题名: CO2 conversion to CO by auto-thermal catalyst-assisted chemical looping
作者: Hu J. ; Buelens L. ; Theofanidis S.-A. ; Galvita V.V. ; Poelman H. ; Marin G.B.
刊名: Journal of CO2 Utilization
ISSN: 22129820
出版年: 2016
卷: 16 起始页码: 8
结束页码: 16
语种: 英语
英文关键词: CO production
; CO2 utilization
; Iron oxide
; Ni-Fe catalyst
; Oxygen storage material
Scopus关键词: Catalysts
; Iron alloys
; Iron oxides
; Nickel
; Sintering
; Co-production
; Fe catalyst
; High conversions
; Methane dry reforming
; Ni-based catalyst
; Oxygen storage materials
; Reduction capacity
; Thermodynamic calculations
; Carbon dioxide
英文摘要: A bifunctional 9 wt.%NiO-16 wt.%Fe2O3/MgAl2O4 material was prepared for CO2 conversion to CO by auto-thermal catalyst-assisted chemical looping. This process is designed to maximize CO2 conversion. The generation of CO from CO2 was investigated between 873 K and 1023 K. The high endothermicity of methane dry reforming and the material deactivation by coke deposition were avoided by the simultaneous feeding of CH4, CO2 and O2 in a 1:1:0.5 molar ratio during the reduction half-cycle of chemical looping. In this half-cycle, interaction of Ni with Fe leads to Ni-Fe alloy formation. The resulting Ni-based catalyst converts CH4 + CO2 + O2 into a mixture of CO and H2, which both reduce Fe3O4, producing CO2 and H2O. In the CO2 re-oxidation half-cycle, CO is produced and the Ni-Fe alloy decomposes into Ni and Fe3O4. The reduction capacity (Rc) of the gas mixture strongly depends on the ratio Rc between reducing and oxidizing gases. Based on thermodynamic calculations, high conversion of Fe3O4 to reduced state can be reached if Rc > 2 and T > 873 K. During prolonged auto-thermal chemical looping at 1023 K, the 9 wt.%NiO-16 wt.%Fe2O3/MgAl2O4 suffers from deactivation in the first five cycles, after which a more stable operation is established. Based on TEM measurements, sintering was found to be the main cause for the initial decrease of CO production. © 2016 Elsevier Ltd. All rights reserved. 资助项目: China Scholarship Council
; Fonds Wetenschappelijk Onderzoek
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52869
Appears in Collections: 影响、适应和脆弱性
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Recommended Citation:
Hu J.,Buelens L.,Theofanidis S.-A.,et al. CO2 conversion to CO by auto-thermal catalyst-assisted chemical looping[J]. Journal of CO2 Utilization,2016-01-01,16