Abstract
The structural changes of a Spanish palygorskite, and their reversibility, have been examined by thermal analysis under vacuum. These changes have been related to the textural values obtained under similar conditions by N 2 adsorption-desorption. The folding of this material under vacuum starts at 125°C, where its microporosity disappears. This folding is reversible up to 300°C. From 125°C, the specific surface area remains stable, corresponding to the external surface of the mineral. Thermal treatment above 300° C generates irreversible folding in the structure.
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