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Effect of Water Vapor on the Redox Reactions of Iron-Based Oxygen Carriers for Chemical Looping Combustion

Iron-based oxygen carriers (OCs) have been the focus of studies at the Center for Applied Energy Research (CAER), University of Kentucky, for the application of chemical looping combustion (CLC) to solid fuels. Freeze granulation (FG) was chosen as a method to produce Fe2O3 on an alumina (Al2O3) OC of appropriate particle size for separation from ash and reactivity to oxidize a coal char in a bench-scale fluid-bed reactor. The purpose of this study was to gain an understanding of the iron oxide transformations, which would occur under CLC fuel reactor conditions, including gas compositions similar to CLC syngas concentrations. A FG OC composed of 50:50 Fe2O3/Al2O3 and a commercial Fe2O3 powder were tested in a thermal analyzer equipped with a water vapor (WV) furnace and a WV generator and coupled to a mass spectrometer (TGMS). This TGMS system allowed for testing of OCs under simulated CLC reducing reactor conditions containing WV. Two reducing gas concentrations consistent with potential syngas in a CLC...

Authors:   Aurora M. Rubel; Yi Zhang; James K. Neathery; Kunlei Liu
Journal:   Energy & Fuels
Year:   2011
DOI:   10.1021/ef2008198
Publication date:   20-Sep-2011
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