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Received October 26, 2005
Accepted March 15, 2006
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Synthesis of manganese oxide particles in supercritical water
Department of Environmental Engineering, Daegu University, 15 Naeriri, Jinryang, Gyoungsan, Gyoungbuk 712-714, Korea 1Department of Chemical Engineering, Daegu University, 15 Naeriri, Jinryang, Gyoungsan, Gyoungbuk 712-714, Korea
Korean Journal of Chemical Engineering, September 2006, 23(5), 714-719(6), 10.1007/BF02705916
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Abstract
The synthesis of manganese oxide and LiMn2O4 particles in supercritical water has been investigated with a residence time of 10-40 seconds. It was suggested that the reaction temperature for SCW process should be relatively higher than the critical temperature of water, to synthesize the particles of uniform size and shape. It was observed that the selective synthesis of LiMn2O4 was mainly dependent of the amount of OH. ion in the reactants. We concluded that the size, shape and structure of particles were strongly influenced by a change in the reaction temperature, reactant composition and OH. ion amount, and thus enabling to synthesize a specific metal oxide particles. The reaction mechanisms for manganese oxides and LiMn2O4 have been proposed with the oxidation, hydrolysis and dehydration steps.
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Adschiri T, Hakuta Y, Arai K, Ind. Eng. Chem. Res., 39(12), 4901 (2000)
Bailar JC, Emeleus HJ, Nyholm SR, Trotman-Dickenson AF, Comprehensive inorganic chemistry, vol. 3, Pergamon Press, New York (1976)
Cabaoas A, Poliakoff M, J. Mater. Chem., 11, 1408 (2001)
Cotton FA, Wilkinson G, Murillo CA, Bochmann M, Advanced inorganic chemistry, 6th Edition, John Wiley & Sons, Inc., New York (1999)
Hakuta Y, Terayama H, Onai S, Adschiri T, Arai K, “Hydrothermal synthesis of CeO2 fine particles in supercritical water,” Proc. 4th Int. Symp. on ‘Supercritical Fluids,’ Sendai, Japan, May, 255-258 (1997)
Hakuta Y, Adschiri T, Suzuki T, Chida T, Senio K, Arai K, J. Am. Ceram. Soc., 81, 2461 (1998)
Hakuta Y, Senio K, Ura H, Adschiri T, Takizawa H, Arai K, J. Mater. Chem., 9, 2671 (1999)
Hakuta Y, Yamamoto Y, Okada KI, Adschiri T, Arai K, Kanamura K, Goto A, Hamagami J, Umegaki T, “Production of spinel LiMn2O4 fine crystals via hydrothermal synthesis in supercritical water,” Proc. 40th Symp.in Japan on ‘Battery,’ Kyoto, Japan, November, 251-252 (1999)
Holleman AF, Wiberg E, Inorganic chemistry, 34th Edn, Academic Press, San Diego (2001)
Lee JH, Kim MH, Choo KH, Ham JY, J. Korean Ind. Eng. Chem., 14(6), 847 (2003)
Nam SC, Kim GJ, Korean J. Chem. Eng., 21(3), 582 (2004)
Rho S, Park S, Korean J. Chem. Eng., 19(1), 120 (2002)
Wakihara M, Li G, Ikuta H, Cathode active materials with a threedimensional spinel framework, Lithium Ion Batteries, Wakihara, M. and Yamamoto, O., eds., Wiley-Vch (1998)
