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Confined water presents unusual properties in comparison with other sorbate species. First of all, the sorption isotherm is of type III, even in the microporous confinement range (Ø < 20 Å). Whatever the pore diameter, water sorption phenomenon looks like the so-called capillary condensation phase transition. Our results clearly valid such an expected behaviour in the mesoporous confinement range...
X-ray or neutron diffractograms of calcined MCM-41 samples are strongly modified during the sorption phenomenon. Intensity of the main (100) peak (I100) could undergo a non monotonous behaviour. At the sorption beginning I100 increases and I100 strongly decreases in the medium and high loading regimes. These observed intensity modifications in the diffractograms are closely related to the MCM-41...
Isotherms of five n-alkanes: propane, butane, pentane, hexane, and heptane in 13 X zeolite have been measured by microgravimetry. In temperature ranges in which the isotherms are reversible, the sorption is described by the statistical model developed by Dupont-Pavlovsky, showing that the sorbed phase is localized. The heat of sorption and the sorbate-sorbate interaction, obtained from the model,...
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