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Irreversible dehydration in montmorillonite

Published online by Cambridge University Press:  14 March 2018

R. Greene-Kelly
R. Greene-Kelly*
Affiliation:
Rothamsted Experimental Station, Harpenden, Herts
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Extract

In a paper to the Faraday Society (1946), Mering showed that the temperature to which one required to heat montmorillonite to produce irreversible collapse of the c-axis depended on the exchangeable cation. With Na-montmorillonite irreversibility began at about 550°C but with Ca-montmorillonite below 350°C During a study of the liquid phase sorption of pyridine by montmorillonite, the writer obtained evidence that irreversible collapse occurred at 200°C with Li-montmorillonite.

The source of montmorillonite was a sample of Wyoming bentonite, which was purified by passing through a Sharples supercentrifuge. The resultant exchange capacity to ammonium acetate at pH 7 was about 90 m.e./100 gms. and the displaced ions chiefly consisted of Na+ and Ca++.

Type
Research Article
Information
Clay Minerals Bulletin , Volume 1 , Issue 7 , June 1952 , pp. 221 - 227
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1952

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References

References

Mering, J. (1946). Trans. Faraday Soc., 42B, 205.Google Scholar
Gonzalez Garcia, F. (1950). Anales de Edafologia y Fisiologia Vegetal, 9, 149.Google Scholar
Hofmann, U. and Klemen, R. (1950). Z. Anorg. Chem., 262, 95.Google Scholar