Adsorption isotherms of methane, ethane, propane,
n-butane, isobutane, carbon dioxide, and sulfur
hexafluoride
were measured gravimetrically on silicalite crystals at temperatures
ranging from 3 to 81 °C and at pressures
up to 2000 kPa. A virial equation was used to correlate the
experimental data and to calculate the isosteric
heats of adsorption and the limiting heats of adsorption at zero
loading. The adsorption isotherms of isobutane
exhibit inflection points at loadings of 4−6 molecules/unit cell in a
certain temperature range. This unusual
adsorption behavior is attributed to adsorption of isobutane in
different locations of the channel system.
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