Abstract
Pillard clays with controlled interpillar distances have been prepared by systematically varying the pillar and clay charges in metal-sarcophagine cage complex/clay systems. In some cases there is very high crystallinity - 14 orders of c-axis diffraction having been observed. Adsorption isotherms have been determined that show that two separate shape-selective effects occur in these materials: (a) molecular sieving due to the interpillar gaps; (b) enhanced adsorption of hydrogen due to the pillar shape allowing penetration under the pillar. These effects are discussed by using molecular modeling calculations to simulate the porosity and available adsorbing surface.
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