Abstract
A combination of high resolution thermogravimetric analysis coupled to a gas evolution mass spectrometer has been used to study the thermal decomposition of synthetic hydrotalcites reevesite (Ni6Fe2(CO3)(OH)16·4H2O) and pyroaurite (Mg6Fe2(SO4,CO3)(OH)16·4H2O) and the cationic mixtures of the two minerals. XRD patterns show the hydrotalcites are layered structures with interspacing distances of around 8.0. Å. A linear relationship is observed for the d(001) spacing as Ni is replaced by Mg in the progression from reevesite to pyroaurite. The significance of this result means the interlayer spacing in these hydrotalcites is cation dependent. High resolution thermal analysis shows the decomposition takes place in 3 steps. A mechanism for the thermal decomposition is proposed based upon the loss of water, hydroxyl units, oxygen and carbon dioxide.
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J. T. Kloprogge and R. L. Frost, Applied Catalysis, A: General, 184 (1999) 61.
A. Alejandre, F. Medina, X. Rodriguez, P. Salagre, Y. Cesteros and J. E. Sueiras, Appl. Catal., B, 30 (2001) 195.
J. Das and K. Parida, React. Kinet. Catal. Lett., 69 (2000) 223.
S. H. Patel, M. Xanthos, J. Grenci and P. B. Klepak, J. Vinyl Addit. Technol., 1 (1995) 201.
V. Rives, F. M. Labajos, R. Trujillano, E. Romeo, C. Royo and A. Monzon, Appl. Clay Sci., 13 (1998) 363.
F. Rey, V. Fornes and J. M. Rojo, J. Chem. Soc., Faraday Trans., 88 (1992) 2233.
M. Valcheva-Traykova, N. Davidova and A. Weiss, J. Mater. Sci., 28 (1993) 2157.
C. O. Oriakhi, I. V. Farr and M. M. Lerner, Clays and Clay Minerals, 45 (1997) 194.
G. Lichti and J. Mulcahy, Chemistry in Australia, 65 (1998) 10.
Y. Seida and Y. Nakano, J. Chem. Eng. Japan, 34 (2001) 906.
Y. Roh, S. Y. Lee, M. P. Elless and J. E. Foss, Clays and Clay Minerals, 48 (2000) 266.
Y. Seida, Y. Nakano and Y. Nakamura, Water Research, 35 (2001) 2341.
M. A. Aramendia, V. Borau, C. Jimenez, J. M. Marinas, J. M. Luque, J. R. Ruiz and F. J. Urbano, Mater. Lett., 43 (2000) 118.
V. R. L. Constantino and T. J. Pinnavaia, Inorg. Chem., 34 (1995) 883.
M. Del Arco, P. Malet, R. Trujillano and V. Rives, Chem. Mater., 11 (1999) 624.
K. Hashi, S. Kikkawa and M. Koizumi, Clays and Clay Minerals, 31 (1983) 152.
L. Ingram and H. F. W. Taylor, Mineralogical Magazine and Journal of the Mineralogical Society, (1876–1968) 36 (1967) 465.
R. M. Taylor, Clay Minerals, 17 (1982) 369.
H. F. W. Taylor, Mineralogical Magazine and Journal of the Mineralogical Society, (1876–1968) 37 (1969) 338.
H. C. B. Hansen and C. B. Koch, Applied Clay Science, 10 (1995) 5.
E. H. Nickel and J. E. Wildman, Mineralogical Magazine, 44 (1981) 333.
D. L. Bish and A. Livingstone, Mineralogical Magazine, 44 (1981) 339.
E. H. Nickel and R. M. Clarke, American Mineralogist, 61 (1976) 366.
P. G. Rouxhet and H. F. W. Taylor, Chimia, 23 (1969) 480.
R. L. Frost, Z. Ding and H. D. Ruan, J. Therm. Anal. Cal., 71 (2003) 783.
R. L. Frost, W. Martens, Z. Ding and J. T. Kloprogge, J. Therm. Anal. Cal., 71 (2003) 429.
E. Horvath, R. L. Frost, E. Mako, J. Kristof and T. Cseh, Thermochim. Acta, 404 (2003) 227.
W. N. Martens, Z. Ding, R. L. Frost, J. Kristof and J. T. Kloprogge, J. Raman Spectroscopy, 33 (2002) 31.
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Frost, R.L., Erickson, K.L. Thermal decomposition of synthetic hydrotalcites reevesite and pyroaurite. Journal of Thermal Analysis and Calorimetry 76, 217–225 (2004). https://doi.org/10.1023/B:JTAN.0000027820.58744.bd
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DOI: https://doi.org/10.1023/B:JTAN.0000027820.58744.bd