Sorption kinetics of neopentane on NaX zeolites of different crystal sizes

Abstract

By means of a constant-volume–variable-pressure method, the sorption kinetics of neopentane on two NaX zeolites with different crystal sizes (17.7 and 120 µm, respectively) have been investigated at 187 K. Whereas the kinetics on the larger crystals are mostly controlled by intracrystalline diffusion under the experimental conditions used, neopentane uptake on smaller crystals should be limited by intercrystalline transport. In both cases heat-transfer effects are superimposed upon the measured mass transport.