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Structural Model of Al13-Pillared Montmorillonite

Published online by Cambridge University Press:  28 February 2024

Virgil I. Dimov ,
Albena V. Ilieva ,
Nelly G. Khaltakova  and
Liudmila D. Filizova
Virgil I. Dimov
Affiliation:
Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences, 1000 Sofia, Bulgaria
Albena V. Ilieva
Affiliation:
Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences, 1000 Sofia, Bulgaria
Nelly G. Khaltakova
Affiliation:
Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences, 1000 Sofia, Bulgaria
Liudmila D. Filizova
Affiliation:
Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences, 1000 Sofia, Bulgaria
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Abstract

Alumina-pillared montmorillonite is prepared by intercalation of polyoxyhydroxy aluminum cations (Al137+) of a natural montmorillonite from Dimitrovgrad, Bulgaria. Transmission electron microscopy, powder X-ray diffraction, energy dispersive X-ray spectroscopy, and surface area (BET) methods are used to study the untreated and pillared forms of the montmorillonite. A structural model involving deformed Al13 pillars is proposed. Four pillar types are derived and these pillars are uniformly distributed over the interlayer-cation positions of montmorillonite. Calculated electron diffraction patterns were simulated using the multi-slice method. The structural model explains the increased ordering along the c axis of the pillared form compared with the untreated montmorillonite. The model explains the structure of a pillared montmorillonite with different distributions of the pillars in the interlayer. The proposed model is consistent with the observed data.

Keywords

Alumina PillaringComputer SimulationKeggin PillaringMontmorilloniteStructural ModelTransmission Electron Microscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 48 , Issue 1 , February 2000 , pp. 1 - 9
Copyright
Copyright © 2000, The Clay Minerals Society

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References

Bottero, J.Y. Gases, I.M. Flessinger, E. and Poirier, J.E., 1980 Studies of hydrolysed aluminium chloride solutions. 1. Nature of Al-species and compositions of aqueous solutions. Journal of Physics and Chemistry 84 2933–2940 10.1021/j100459a021.CrossRefGoogle Scholar
Brindley, G.W., Brindley, G.W. and Brown, G., 1980 Order-disorder in clay mineral structures Crystal Structure of Clay minerals and Their X-ray Identification London Mineralogical Society 169–174.CrossRefGoogle Scholar
Čapková, P. Driessen, A.J. Numan, M. Schenk, H. Weiss, Z. and Klika, Z., 1998 Molecular simulations of mont-morillonite intercalated with aluminium complex cations. Part 1: Intercalation with [A113O4(OH)24+X(H2O)12-X](7-x)+ Clays and Clay Minerals 46 232–239 10.1346/CCMN.1998.0460302.CrossRefGoogle Scholar
Cowley, J.M. and Moodie, A.F., 1957 The scattering of electrons by atoms and crystals: I. A new theoretical approach. Acta Crystallographica A10 609–619 10.1107/S0365110X57002194.CrossRefGoogle Scholar
Figueras, F., 1988 Pillared clays as catalysts. Catalysis Reviews: Science and Engineering .CrossRefGoogle Scholar
Figueras, F. Klapyta, Z. Auruox, A. and Gouguen, C., 1990 Influence of the structure of the original clay on the properties of PILC materials Proceedings of the International Clay Conference, Strasbourg, 1989 86 25–35.Google Scholar
Fijal, J. Klapyta, Z. and Konta, J., 1993 Heterogeneity of pillared clays Proceedings of the 11th Conference on Clay Mineralogy and Petrology Prague Univerzita Karlova 99–109.Google Scholar
Foster, M.D., 1953 Geochemical studies of clay minerals: II. The determination of free silica and alumina in mont-morillonite. Geochemica et Cosmochimica Acta 3 143–154 10.1016/0016-7037(53)90003-9.CrossRefGoogle Scholar
Fripiat, J.J., 1988 High resolution solid state NMR study of pillared clays. Catalysis Today 2 281–295 10.1016/0920-5861(88)85010-7.CrossRefGoogle Scholar
Ilieva, A., 1996 Application of the aikylammonium exchange for layer charge determination of montmorillonites from Bulgarian bentonites. Comptes Rendus de l’Academie Bulgare des Sciences 49 99–103.Google Scholar
Johansson, G., 1960 On the crystal structure of some basic aluminium salts. Acta Chemica Scandinavica 14 771–773 10.3891/acta.chem.scand.14-0771.CrossRefGoogle Scholar
Kodama, H. and Singh, S., 1989 Polynuclear hydroxyalu-minium-montmorillonite complexes: Formation of 18.8 A and 28 A pillared structures. Solid State Ionics 32/33 363–372 10.1016/0167-2738(89)90242-7.CrossRefGoogle Scholar
Occelli, M.I. Lynch, J. and Senders, J.V., 1987 TEM analysis of pillared and delaminated hectorite catalysts. Journal of Catalysis 107 557–565 10.1016/0021-9517(87)90319-8.CrossRefGoogle Scholar
Pinnavaia, T.J., 1983 Intercalated clay catalysts. Science 220 365–371 10.1126/science.220.4595.365.CrossRefGoogle ScholarPubMed
Plee, D. Gatineau, L. and Fripiat, J.J., 1987 Pillaring process of smectites with and without tetrahedral substitutions. Clays and Clay Minerals 35 81–85 10.1346/CCMN.1987.0350201.CrossRefGoogle Scholar
Schönherr, S. Görz, H. and Müller, D., 1981 Herstellen und Characterisierung von Al13O40Cl-Wasserlosung. Zeitschrift Fuer Anorganishe und Algemeine Chemie 476 188–193 10.1002/zaac.19814760522.CrossRefGoogle Scholar
Schoonheydt, R.A., 1994 Clays: From two to three dimensions. Studies on Surface Science and Catalysis 58 201–239 10.1016/S0167-2991(08)63604-6.CrossRefGoogle Scholar
Schoonheydt, R.A. van den Eynde, J. Tubbax, H. Leeman, H. Stuyckens, M. Lenotte, I. and Stone, W.E.E., 1993 The Al pillaring of clays. Part I. Pillaring with dilute and concentrated Al solutions. Clays and Clay Minerals 41 598–608 10.1346/CCMN.1993.0410510.CrossRefGoogle Scholar
Schoonheydt, R.A. Leeman, H. Scorpion, A. Lenotte, I. and Grobet, P., 1994 The Al pillaring of clays. Part II. Pillaring with [Al13O4(OH)24(H2O)12]7+. Clays and Clay Minerals 42 518–526 10.1346/CCMN.1994.0420502.CrossRefGoogle Scholar
Storaro, L. Lenarda, M. Ganzeria, R. and Rinaldi, A., 1996 Preparation of hydroxy Al and Al/Fe pillared bentonites from concentrated clay suspensions. Microporous Materials 6 55–63 10.1016/0927-6513(95)00081-X.CrossRefGoogle Scholar
Tilak, D. Tennakoon, B. Jones, W. and Thomas, J.M., 1986 Structural aspects of metal-oxide-pillared sheet silicates. Journal of the Chemical Society, Faraday Transitions 1 82 3081–3095 10.1039/f19868203081.Google Scholar
Tsipursky, S.I. and Drits, V.A., 1984 The distribution of octahedral cations in the 2:1 layers of dioctahedral smectites studied by oblique-texture electron diffraction. Clay Minerals 21 187–198.Google Scholar
Vaughan, D.E.W. Lussier, R.J. and Rees, L.V., 1980 Preparation of molecular sieves based on pillared interlayered clays (PILC) Proceedings of the 5th International Conference on Zeolites, 1980 London Hyden 94–101.Google Scholar
Vaughan, D.E.W., 1988 Pillared clays—a historical perspective. Catalysis Today 2 187–198 10.1016/0920-5861(88)85002-8.CrossRefGoogle Scholar