Abstract
An analytically solvable lattice model was used to study the difference in the physics of p-xylene adsorption in ORTHO and PAPA phases of silicalite. The model predicts that a phase transition of p-xylene in the pore space does not necessarily require a silicalite-phase transition. Conditions for the sorbate-phase transition are identified. The sign of the sorbate-sorbate interactions is critical to sorbate-phase transition. It is suggested that although the sorbate- and sorbent-phase transitions can be distinct events, there is strong coupling between the two. It is reasonable to suppose that the fluid-phase change may drive the zeolite phase change. Finally, this equilibrium study suggests the possibility of hysteresis at higher coverages depending on the kinetics of adsorption.
Original language | English (US) |
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Pages (from-to) | 1662-1675 |
Number of pages | 14 |
Journal | AIChE Journal |
Volume | 46 |
Issue number | 8 |
DOIs | |
State | Published - 2000 |