Ce-Fe oxygen carriers for chemical-looping steam methane reforming

被引:196
作者
Zhu, Xing [1 ,2 ]
Wei, Yonggang [1 ,2 ]
Wang, Hua [1 ,2 ]
Li, Kongzhai [1 ,2 ]
机构
[1] Kunming Univ Sci & Technol, Fac Met & Energy Engn, Kunming 650093, Peoples R China
[2] Kunming Univ Sci & Technol, Engn Res Ctr Met Energy Conservat & Emiss Reduct, Minist Educ, Kunming 650093, Peoples R China
基金
中国国家自然科学基金;
关键词
Hydrogen; Syngas; Chemical-looping steam methane reforming; Ce-Fe mixed oxides; Oxygen carrier; Redox process; CEO2-ZRO2 MIXED OXIDES; HYDROGEN-PRODUCTION; LATTICE OXYGEN; SYNTHESIS GAS; PARTIAL OXIDATION; SYNGAS PRODUCTION; REDOX SYSTEM; STEPWISE PRODUCTION; DIRECT CONVERSION; SOLID-SOLUTION;
D O I
10.1016/j.ijhydene.2013.01.115
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Chemical-looping steam methane reforming (CL-SMR) is a novel process for the co-production of pure hydrogen and syngas (synthesis gas) without purification processes. Ce1-xFexO2-delta oxides (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 1) prepared by chemical precipitation were characterized by X-ray powder diffraction, BET, Raman spectra, temperature-programmed reduction technologies and used as oxygen carrier for the CL-SMR process. The methane conversion/water splitting redox properties of samples were evaluated at the different temperatures (800, 850, and 900 degrees C). With the combination of CeO2 and Fe2O3, Fe2O3 particles were well dispersed on ceria surface and a small amount of iron ions was incorporated into the CeO2 lattice to form a Ce-Fe-O solid solution. It was found that reducibility of CeO2 was enhanced by the added Fe2O3. These results therefore led to the conclusion of the strong Ce-Fe interaction in CeO2-Fe2O3 mixed oxides. As a result, the redox activity of CL-SMR was significantly improved, and increased in desired product yield. The redox performance was also affected by the redox temperatures, and the desired product yield was obviously enhanced at the higher temperatures. It was found that Ce0.5Fe0.5O2-delta oxygen carrier showed the highest performance for the co-production of syngas and hydrogen. Copyright (c) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:4492 / 4501
页数:10
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