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Received January 15, 2002
Accepted March 19, 2002
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Kinetics on Dehydration Reaction during Thermal Treatment of MgAl-CO3-LDHs
Department of Chemistry-BK21 and the Institute of Basic Science, SungKyunKwan University, Suwon 440-746, Korea 1Radioactive Waste Disposal Team, Korea Atomic Energy Research Institute, Daejeon 305-600, Korea
munkang@kaeri.re.kr
Korean Journal of Chemical Engineering, July 2002, 19(4), 653-657(5), 10.1007/BF02699312
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Abstract
Kinetics on the dehydration reaction of interlayer water during the thermal treatment of synthetic LDHs was studied. LDHs with different layer charges such as Mg8Al2-CO3-LDH, Mg6Al2-CO3-LDH and Mg4Al2-CO3-LDH were used. The powder X-ray diffraction patterns and TGA diagrams of synthetic LDHs show the typical structural and thermal properties of MgAl-LDHs intercalated with carbonate. The non-isothermal kinetics for the loss of interlayer water molecules was investigated by the TGA diagrams. The water molecules dehydrated from interlayer of LDHs_x000D_
with similar activation energies of 106, 105 and 107 kJ mol(-1) for the Mg8Al2-CO3-LDH, Mg6Al2-CO3-LDH and Mg4Al2-CO3-LDH at each inflection point of TGA curves, respectively. The dehydration reactions were controlled by the diffusion of water molecules through two-dimensional interlayers, and the frequency factors were 5.78×10(11), 5.68×10(10)_x000D_
and 4.66×10(10) min(-1) for the Mg8Al2-CO3-LDH, Mg6Al2-CO3-LDH and Mg4Al2-CO3-LDH, respectively.
Keywords
References
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Kang MJ, Rhee SW, Moon H, Neck V, Fanghanel T, Radiochim. Acta, 75, 169 (1996)
Kang MJ, Rhee SW, Hahn PS, HWAHAK KONGHAK, 39(4), 517 (2001)
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Mascolo G, Marino O, Miner. Mag., 43, 619 (1980)
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Rhee SW, Kang MJ, Kim H, Moon H, Environ. Technol., 18, 231 (1997)
Rives V, Inorg. Chem., 38(2), 406 (1999)
Taylor HFW, Miner. Mag., 39, 377 (1973)
Sato T, Kato K, Endo T, Shimada M, React. Solids, 2, 253 (1986)
Sato T, Wakabayashi T, Shimada M, Ind. Eng. Chem. Prod. Res. Dev., 25, 89 (1986)
Vaccari A, Appl. Clay Sci., 10, 1 (1995)
Velu S, Ramkumar V, Narayanan A, Swamy CS, J. Mater. Sci., 32(4), 957 (1997)
Yun SK, Pinnavaia TJ, Chem. Mater., 7, 348 (1995)
Zsako J, J. Phys. Chem., 72, 2406 (1968)
