Bond Energy of Adsorbed and Interlayer Water: Kerolite Dehydration at Elevated Pressures

Anna Kokines Miller, Stephen Guggenheim and August F. Koster van Groos
Department of Geological Sciences, University of Illinois at Chicago Chicago, Illinois 60680

Abstract: The dehydration reaction of kerolite was investigated using high-pressure differential thermal analysis at pressures as high as 600 bars. The peak associated with the dehydration is broad, suggesting the presence of a series of overlapping reactions ranging from the release of adsorbed water to interlayer water. The peak temperature is 136°C at 1.8 bars and increases to 516°C at 586 bars. The primary reaction represents loss of adsorbed water having a bond energy of 1.5 ± 1 kJ/mole. A small amount of water may be present as interlayer water and has a bond energy of 7.5 ± 3 kJ/mole.

Key Words: Bond energy • Dehydration • High-pressure differential thermal analysis • Kerolite • Water

Clays and Clay Minerals; April 1991 v. 39; no. 2; p. 127-130; DOI: 10.1346/CCMN.1991.0390202
© 1991, The Clay Minerals Society
Clay Minerals Society (www.clays.org)