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Thermogravimetric and infrared study of the desorption of butylamine, cyclohexylamine and pyridine from Ni- and Co-exchanged montmorillonite

Published online by Cambridge University Press:  09 July 2018

C. Breen
C. Breen*
Affiliation:
Chemistry Division, School of Science, Sheffield City Polytechnic, Pond Street, Sheffield S1 1WB, UK
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Abstract

The acidity of Ni2+- and Co2+-exchanged montmorillonite has been probed using the diagnostic bases n-butylamine, cyclohexylamine and pyridine. Derivative thermograms for the desorption of pyridine from Ni2+- and Co2+-exchanged montmorillonite exhibited strong maxima at 40°, 90° and 360°C together with a weak maximum near 170°C The desorption maximum at 360°C is usually attributed to desorption of base from Bronsted acid sites. However, IR spectra of pyridine adsorbed on Ni2+- and Co2+-exchanged montmorillonite, at 250°C were dominated by intense bands near 1450 and 1607 cm−1 which are diagnostic of Lewis-bound pyridine. Consequently, the desorption maximum at 360°C must, in this instance, be attributed to desorption of pyridine from Lewis acid centres. Other bases, including cyclohexylamine and butylamine, also desorb at temperatures which have previously been attributed to the desorption of protonated base. Ni2+- and Co2+-exchanged clay contained predominatly Lewis acid or electron accepting sites, which is in marked contrast to the behaviour of trivalent cation exchanged clays.

Type
Research Article
Information
Clay Minerals , Volume 26 , Issue 4 , December 1991 , pp. 487 - 496
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1991

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References

Adams, J.M. (1987) Synthetic organic chemistry using pillared, cation-exchanged and acid-treated montmorillonite catalysts—A review. App. Clay Sci., 2, 309–342.CrossRefGoogle Scholar
Adams, J.M., Ballantine, J.A., Graham, S.H., Laub, R.J., Purnell, J.H., Reid, P.I., Shaman, W.Y.M. & Thomas, J.M. (1979) Selective chemical conversion using sheet silicates: low temperature addition of water to 1-alkenes. J. Catal., 58, 238–252.CrossRefGoogle Scholar
Adams, J.M., Clement, D.E. & Graham, S.H. (1982) Synthesis of methyl-f-butyl ether from methanol and isobutene using a clay catalyst. Clays Clay Miner., 30, 129–134.Google Scholar
Adams, J.M., McCabe, R.W. & Martin, K. (1987) Catalysis of Diels-Alder cycloaddition reactions by ion-exchanged montmorillonite. Proc. Int. Clay Conf. Denver,, 324–328.Google Scholar
Adams, J.M. & Gabbut, A.J. (1990) Interaction of smectites with organic photochromic compounds. J. Inch Phenom. Mol. Recog. Chem., 9, 63–83.Google Scholar
Ballantine, J.A., Davies, M., O'Neil, R.M., Patel, I., Purnell, J.H., Ravanokorn, M., Williams, K.T. & Thomas, J.M. (1984) Organic reactions catalysed by sheet silicates: ester production by direct addition of carboxylic acids to alkenes. J. Mol. Catal., 26, 51–11. Google Scholar
Ballantine, J.A., Purnell, J.H., Rayankorn, M. & Thomas, J.M. (1985) Organic reactions catalysed by sheet silicates: intermolecular elimination of ammonia from primary amines. J. Mol. Catal., 30, 378–388.Google Scholar
Ballantine, J. A. (1986) The reactions in clays and pillared clays. Pp. 197-212 in: Chemical Reactions in Organic and Inorganic Constrained Systems(Button, R., editor). Riedel, Dordrecht.Google Scholar
Ballantine, J.A., Graham, P., Patel, I., Purnell, J.H., Williams, K. & Thomas, J.M. (1987) New differential thermogravimetric method using cyclohexylamine for measuring the concentration of interlamellar protons in clay catalysts. Proc. Int. Clay Conf. Denver,, 311–318.Google Scholar
Breen, C., Deane, A.T. & Flynn, J.J. (1987) The acidity of trivalent cation-exchanged montmoriHonite. Temperature programmed desorption and infrared studies of pyridine and «-butylamine. Clay Miner., 22, 169–178.Google Scholar
Breen, C. (1991) Thermogravimetric study of the desorption of cyclohexylamine and pyridine from an acid-treated Wyoming bentonite. Clay Miner., 26, 473–486.CrossRefGoogle Scholar
Calvet, R. & Prost, R. (1971) Cation migration into empty octahedral sites and surface properties of clays. Clays Clay Miner., 19, 175–186.CrossRefGoogle Scholar
Deane, A.T. (1987) Physicochemical studies of clay-organic interactions.PhD thesis, NIHE, Dublin, Eire. Gasser, R.P.H. (1987) An Introduction to Chemisorption and Catalysis by Metals, p. 66–71. Oxford Science Publications, Clarendon Press, Oxford.Google Scholar
Hofmann, V. & Klemen, R. (1950) Verlust der Austaush fahigkeit von Lithiumionen und Bentonit durch Erhitzung. Z. Anorg. AUg. Chem., 262, 95–99.Google Scholar
Koppelman, M.H. & Dillard, J.G. (1977) A study of the adsorption of Ni(II) and Cu(II) by clay minerals. Clays Clay Miner., 25, 457–462.Google Scholar
Thomas, J.M. (1982) Sheet silicate intercalates: New agents for unusual chemical conversions. Pp. 56–97 in: Intercalation Chemistry(Whittingham, M.S. & Jacobson, A.J., editors). Academic Press, New York.Google Scholar
Tronconi, E. & Forzatti, P. (1985) Experimental criteria for diffusional limitations during temperature programmed desorption from porous catalysts. J. Catal., 93, 197–200.Google Scholar
Velghe, F., Schoonheydt, R.A. & Uytterhoeven, J.B. (1977) The co-ordination of hydrated Cu(II)- andNi(II)-ions on montmoriHonite surface. Clays Clay Miner., 25, 375–380.CrossRefGoogle Scholar
Ward, J.W. (1968) Spectroscopic study of the surface of zeolite Y: the adsorption of pyridine. J. Coll. Inter. Sci., 28, 269–277.CrossRefGoogle Scholar