Related Experiment Video
Updated: Jul 11, 2026

Synthesis of Zeolites Using the ADOR (Assembly-Disassembly-Organization-Reassembly) Route
Published on: April 3, 2016
Diffusion of water in zeolites
Abstract:
The self-diffusion coefficient D of water occluded in samples of near-faujasite has been determined by pulsed field-gradient spin-echo nuclear magnetic resonance. The value of D in square centimeters per second x 10(5) at 30 degrees C is 1.34, 1.65, and 1.88 in the following zeolites, respectively: Na X, Ca X, and Ca Y (X and Y being an indication of ratio of silicon to aluminum in the zeolites). By comparison, the value of D in pure water at 30 degrees C is 2.5 x 10(-5) cm(2)/sec. Arrhenius activation energies for D are 6.9, 6.8, and 5.6 kilocalories per mole, respectively, for the three faujasites and 5.0 kcal/mole for pure water. Thus, there appears to be little difference in diffusion behavior between free water and water occluded in faujasite.
Related Concept Videos
Diffusion
Diffusion
Osmosis
Water, like other substances, moves from a high concentration of free water...
Osmosis
Aquaporins
Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

