The Effect of Heating <i>In Vacuo</i> on the Microporosity of Sepiolite

Abstract

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.