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Preparation and Properties of Large-Pore La-Al-Pillared Montmorillonite

Published online by Cambridge University Press:  02 April 2024

Johan Sterte
Johan Sterte*
Affiliation:
Department of Engineering Chemistry I, Chalmers University of Technology, 412 96 Göteborg, Sweden
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Abstract

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Large-pore La-Al-pillared montmorillonite was prepared by reacting montmorillonite with hydrothermally treated mixtures of aluminum chlorohydrate and lanthanum chloride. The large-pore La-Al-pillared montmorillonite is characterized by basal spacings of about 26 Å, surface areas of 300–500 mVg, and pore volumes in the range 0.2–0.3 cm2/g. Large-pore pillared montmorillonite products were obtained from solutions refluxed for >72 hr or treated in autoclaves at 120°–160°C for 12–96 hr. The most favorable pillaring solution for the production of large-pore La-Al-pillared montmorillonite had an OH/Al ratio of 2.5, a La:Al ratio of 1:5, and was 2.5 M with respect to Al. The elemental composition of large pore La-Al-pillared montmorillonite is similar to that of a conventional Al-pillared montmorillonite that has a basal spacing of about 19 Å. The 26-Å spacing is believed to be associated with the formation of large polymeric La-bearing Al-cations upon hydrothermal treatment of the solutions.

Keywords

AluminumCross-linked smectiteLanthanumMontmorillonitePillared interlayer complexesX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 2 , April 1991 , pp. 167 - 173
Copyright
Copyright © 1991, The Clay Minerals Society

References

Gregg, S. J. and Sing, K. S. W., 1982 Adsorption, Surface Area and Porosity 4 90 – 100.Google Scholar
Grim, R. E., 1968 Clay Mineralogy London McGraw-Hill 78.Google Scholar
Innes, W. B., 1957 Use of a parallel plate model in calculation of pore size distribution Anal. Chem. 29 1069 – 1073.CrossRefGoogle Scholar
McCauley, J. R., 1988 Stable intercalated clays and preparation method Int. Pat. Appl. .Google Scholar
Medlin, J.H. Suhr, N.H. and Bodkin, J.B., 1969 Atomic absorption analysis of silicates employing LiBO2 fusion At. Absorpt. Newsl. 8 25 – 29.Google Scholar
Nilsson, P. and Otterstedt, J.-E., 1987 Effect of composition of the feedstock on the catalytic cracking of heavy vacuum gas oil Appl. Catal. 33 145 – 156.CrossRefGoogle Scholar
Plee, D., Borg, F., Gatineau, L. and Fripiat, J. J., 1985 High resolution solid state 27A1 and 28Si nuclear magnetic resonance study of pillared clays J. Amer. Chem. Soc. 107 2362 – 2369.CrossRefGoogle Scholar
Shabtai, J., Massoth, F. E., Tokarz, M., Tsai, G. M. and McCauley, J., 1984 Characterization and molecular shape selectivity of cross-linked montmorillonite (CLM) catalysts Proc. 8th Internat. Congress Catal., Berlin 1984 4 735 – 745.Google Scholar
Sterte, J., 1989 Hydrothermal stability and catalytic cracking performance of some pillared clays Preprints ACS Dix. Petr. Chem. 34 489 – 496.Google Scholar
Vaughan, D. E. W. Lussier, R. J. and Magee, J. S., 1979 Pillared interlayered clay materials useful as catalysts and adsorbents U.S. Patent 4,176,090 .Google Scholar