Abstract
By analyzing the shape of the 1H PFG NMR spin echo decay of methane in large crystals of AlPO 4-5, we demonstrate that diffusion of methane is unidirectional but not single file. The intracrystalline diffusion coefficient is 2.9 × 10 −9 m 2s −1. The same experiment, when performed on AlPO 4-5 crystals of much smaller size, results in an isotropic diffusivity that is higher by nearly three orders of magnitude. This crystal size artifact emphasizes the importance of using large zeolite crystals in NMR measurements to obtain intracrystalline diffusivities.
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