Abstract
Normal hexane sorption isobars for high silica ZSM-5 display an inflection; the derivative curve clearly reveals two, equal area, distinct peaks, indicating two adsorption regimes for hexane in ZSM-5. The break between the two peaks occurs at 3.7 hexane molecules/unit cell, close to 4, the number of intersections (I), the number of straight channel double ten rings (S), and the number of zig-zag channel double ten rings (Z)/unit cell. The high loading region (5–8 molecules of n-hexane/unit cell) hexane desorbs rapidly relative to desorption in the low loading region (0–4/unit cell). n-Decane does not show this effect; a single peak is observed in its derivative desorption curve. The length of the n-hexane molecule is equal to the length of potential channel adsorption segments, indicating that molecular length is the critical factor. Entropic factors are likely responsible for the weaker adsorption at higher loadings.
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