Journal
FUEL PROCESSING TECHNOLOGY
Volume 146, Issue -, Pages 56-61Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fuproc.2016.02.017
Keywords
Iron oxide; Chemical looping; Carbon monoxide; NiO; Isomorphous replacement
Funding
- National Science Foundation of China (NSFC) [51176062, 51576081]
- Research Project of Chinese Ministry of Education [20130142110086]
- Program for New Century Excellent Talents in University [NCET-13-0226]
- Hubei Natural Science Funds for Distinguished Young Scholar [2013CFA036]
- Foundation of State Key Laboratory of Coal Combustion [FSKLCCB1404]
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Using Fe2O3, Fe2O3/Al2O3, and Fe2O3-NiO/Al2O3 as oxygen carriers (OCs) on chemical looping combustion with CO was investigated in this study. All the modified iron-based OCs were prepared by sol-gel method, and the samples were characterized by X-ray diffraction (XRD), N-2 adsorption/desorption, and scanning electron microscope/energy dispersive X-ray spectroscopy. The temperature-programmed reduction showed that loading on Al2O3 will promote the reduction of Fe2O3 to Fe3O4, but further reduction will be inhibited, and the addition of NiO can effectively reduce this inhibition. Thermogravimetric analysis also revealed that NiO addition can improve the maximum reaction rate of iron-based OCs in the oxidation stage. Mixing with NiO will also decrease the oxygen capacity of iron-based OCs. The XRD data of the reduced samples showed that both Al2O3 and NiO have an isomorphous replacement effect on Fe3O4. The isomorphous replacement effect of NiO is much stronger than that of Al2O3. Thus, NiO introduction can effectively inhibit the formation of FeAl2O4 and promote the further reduction of Fe-oxides to Fe. However, Ni2+ will replace part of the Fe2+ in Fe3O4 to form NiFe2O4 and slightly decrease the oxygen capacity of iron-based OCs. (C) 2016 Elsevier B.V. All rights reserved.
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