Kinetics on Dehydration Reaction during Thermal Treatment of MgAl-CO3-LDHs

Seog Woo Rhee; Mun Ja Kang

Korean Journal of Chemical Engineering, Vol.19, No.4, 653-657, July, 2002

DOI10.1007/BF02699312 Export Citation

Kinetics on Dehydration Reaction during Thermal Treatment of MgAl-CO3-LDHs

Seog Woo Rhee, and Mun Ja Kang^{1, †}

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

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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 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) and 4.66×10(10) min(-1) for the Mg8Al2-CO3-LDH, Mg6Al2-CO3-LDH and Mg4Al2-CO3-LDH, respectively.

Keywords:Layered Double Hydroxide;Non-isothermal Kinetics;Dehydration;Thermogravimetric Analysis (TGA)

[References]

Allmann R, Acta Crystallogr. Sect. B-Struct. Sci., B24, 972 (1968)
Barriga C, Fernandez JM, Ulibarri MA, Labajos FM, Rives V, J. Solid State Chem., 124, 205 (1996)
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Chibwe K, Jones W, J. Chem. Soc.-Chem. Commun., 926 (1989)
Constantino VRL, Pinnavaia TJ, Inorg. Chem., 34(4), 883 (1995)
Ogawa M, Kuroda K, Chem. Rev., 95(2), 399 (1995)
del Arco M, Matin C, Martin I, Rives V, Trujilano R, Spectrochim. Acta, 49, 1575 (1993)
Horowitz HH, Metzger G, Anal. Chem., 35, 1464 (1963)
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)
Kim S, Chun HD, Korean J. Chem. Eng., 12(4), 448 (1995)
Mascolo G, Marino O, Miner. Mag., 43, 619 (1980)
Miyata S, Clays Clay Miner., 28, 50 (1980)
Miyata S, Clays Clay Miner., 31, 305 (1983)
Parker LM, Milestone NB, Newman RH, Ind. Eng. Chem. Res., 34(4), 1196 (1995)
Powder Diffraction Files, Joint Committee on Powder Diffraction Standards, Card No. 22-700 (1986)
Powder Diffraction Files, Joint Committee on Powder Diffraction Standards, Card No. 14-191 (1986)
Reichle WT, Kang SY, Everhardt DS, J. Catal., 101, 352 (1986)
Rhee SW, Kang MJ, Moon H, J. Korean Chem. Soc., 39, 627 (1995)
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)

[Referenced By]

[1] Allmann R, Acta Crystallogr. Sect. B-Struct. Sci., B24, 972 (1968)

[2] Barriga C, Fernandez JM, Ulibarri MA, Labajos FM, Rives V, J. Solid State Chem., 124, 205 (1996)

[3] Brindley GW, Kikkawa S, Clays Clay Miner., 28, 87 (1980)

[4] Brown ME, Phillpotts CAR, J. Chem. Educ., 55, 556 (1978)

[5] Bruce DW, O'Hare D, "Inorganic Materials," John Wiley and Sons, New York (1996)

[6] Cavani F, Trifiro F, Vaccari A, Catal. Today, 11, 173 (1991)

[7] Chibwe K, Jones W, J. Chem. Soc.-Chem. Commun., 926 (1989)

[8] Constantino VRL, Pinnavaia TJ, Inorg. Chem., 34(4), 883 (1995)

[9] Ogawa M, Kuroda K, Chem. Rev., 95(2), 399 (1995)

[10] del Arco M, Matin C, Martin I, Rives V, Trujilano R, Spectrochim. Acta, 49, 1575 (1993)

[11] Horowitz HH, Metzger G, Anal. Chem., 35, 1464 (1963)

[12] Kang MJ, Rhee SW, Moon H, Neck V, Fanghanel T, Radiochim. Acta, 75, 169 (1996)

[13] Kang MJ, Rhee SW, Hahn PS, HWAHAK KONGHAK, 39(4), 517 (2001)

[14] Kim S, Chun HD, Korean J. Chem. Eng., 12(4), 448 (1995)

[15] Mascolo G, Marino O, Miner. Mag., 43, 619 (1980)

[16] Miyata S, Clays Clay Miner., 28, 50 (1980)

[17] Miyata S, Clays Clay Miner., 31, 305 (1983)

[18] Parker LM, Milestone NB, Newman RH, Ind. Eng. Chem. Res., 34(4), 1196 (1995)

[19] Powder Diffraction Files, Joint Committee on Powder Diffraction Standards, Card No. 22-700 (1986)

[20] Powder Diffraction Files, Joint Committee on Powder Diffraction Standards, Card No. 14-191 (1986)

[21] Reichle WT, Kang SY, Everhardt DS, J. Catal., 101, 352 (1986)

[22] Rhee SW, Kang MJ, Moon H, J. Korean Chem. Soc., 39, 627 (1995)

[23] Rhee SW, Kang MJ, Kim H, Moon H, Environ. Technol., 18, 231 (1997)

[24] Rives V, Inorg. Chem., 38(2), 406 (1999)

[25] Taylor HFW, Miner. Mag., 39, 377 (1973)

[26] Sato T, Kato K, Endo T, Shimada M, React. Solids, 2, 253 (1986)

[27] Sato T, Wakabayashi T, Shimada M, Ind. Eng. Chem. Prod. Res. Dev., 25, 89 (1986)

[28] Vaccari A, Appl. Clay Sci., 10, 1 (1995)

[29] Velu S, Ramkumar V, Narayanan A, Swamy CS, J. Mater. Sci., 32(4), 957 (1997)

[30] Yun SK, Pinnavaia TJ, Chem. Mater., 7, 348 (1995)

[31] Zsako J, J. Phys. Chem., 72, 2406 (1968)