The Effect of Heating in Vacuo on the Microporosity of Sepiolite

A. J. Dandy and M. S. Nadiye-Tabbiruka
School of Natural Resources, University of the South Pacific, Suva, Fiji
Department of Chemistry, Makerere University, Kampala, Uganda

Abstract: The t-plot method has been applied to the results of nitrogen adsorption at 76°K on sepiolite first heated in vacuo at various temperatures. Heating sepiolite samples in vacuo at 427°K results in a large decrease in surface area compared with samples outgassed at 373°K. A change in structure and a consequent collapse of micropores is postulated. However, the t-plots indicate that some microporosity remains. Outgassing at 623°K appears to destroy completely the micropores.

Clays and Clay Minerals; December 1975 v. 23; no. 6; p. 428-430; DOI: 10.1346/CCMN.1975.0230603
© 1975, The Clay Minerals Society
Clay Minerals Society (www.clays.org)