Abstract
After expansion with SiO2·TiO2 colloidal particles and supercritical drying (SCD) with CO2, samples of montmorillonite and saponite can generate materials with high (450–650 m2/g) surface area, macroporosity (350–400 m2/g), and pore volume (~1.5 cc/g), which are thermally stable to 800°C. If drying at supercritical conditions is replaced by air drying (AD), the clays lose their macroporosity, and in the case of montmorillonite, a large decrease in BET surface area is also observed.
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Occelli, M.L., Takahama, K., Yokoyama, M., Hirao, S. (1992). Surface and Cracking Properties of Expanded Clays Dried with a Supercritical Fluid. In: Occelli, M.L., Robson, H.E. (eds) Expanded Clays and Other Microporous Solids. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-8866-1_5
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DOI: https://doi.org/10.1007/978-1-4684-8866-1_5
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