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Pulsed proton NMR, which is able to distinguish between molecules in large cavities and in the small pores, as the latter give rise to a fast-decaying part in the free induction decay, gave a first-order rate equation for ammonia penetration into a sodalite unit expressed as penetration half-times. The activation energy was 120 kj/mole, and there was no rate difference between X and Y zeolites.

Kinetics of ammonia penetrating into the sodalite units of sodium faujasites studied by nuclear magnetic resonance