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Redox Characteristics of Cobalt Oxide based Oxygen Carriers for Chemical-Looping Combustion  

Lee, J.B. (Department of Fine Chemicals Engineering & Chemistry, Chung nam National University)
Park, C.S. (Korea Institute of Energy Research)
Choi, S.I. (Korea Institute of Energy Research)
Song, Y.W. (Department of Fine Chemicals Engineering & Chemistry, Chung nam National University)
Yang, H.S. (Department of Fine Chemicals Engineering & Chemistry, Chung nam National University)
Kim, Y.H. (Department of Fine Chemicals Engineering & Chemistry, Chung nam National University)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.15, no.1, 2004 , pp. 46-53 More about this Journal
Abstract
Redox characteristics of cobalt oxide-based oxygen carriers were tested for chemical-looping combustion. Cobalt oxide was chosen as active metal oxide and $CoAl_2O_4$ was compared with YSZ(yttria-stabilized zirconia) as a binder. Cobalt oxide/$CoAl_2O_4$ was prepared by sol-gel method. Hydrogen fuel was reacted with metal oxide and then the reduced metal was successively oxidized by air. The effects of reaction temperature were measured and the regenerabilies during 10 cycles were examined by a TGA. In regenerability of cobalt oxide/YSZ and cobalt oxide/$CoAl_2O_4$, after they showed above 90% conversion in first reduction, they were stabilized in about 70-75% conversion. From reaction rate constant obtained, the activation energies of cobalt oxide/YSZ in oxidation and reduction were 51.47kJ/mol and 7.71kJ/mol respectively.
Keywords
Chemical-looping combustion; Hydrogen energy; Cobalt oxide; Oxygen carrier; YSZ; CoAl_2O_4;
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