PFG NMR study of diffusion in MFI-type zeolities: evidence of the existence of intracrystalline transport barriers

Article Abstract:

The intracrystalline diffusion of methane and n-butane molecules in MFI-type zeolites at several temperatures and over a wide range of diffusion times is investigated applying the PFG NMR technique. The results of the study reveals that diffusion coefficients progressively decreasing with increasing root-meansquare displacements.

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Inhomogeneous distribution of water adsorbed under low pressure in CrAPO-5 and SAPO-5: An interference microscopy study

Article Abstract:

Incrystalline concentration profiles of water, adsorbed in large crystals of CrAPO-5 and SAPO-5 under equilibrium with water vapor at one and 20 mbar, are determined with the use of inference microscopy. The results indicate high inhomogeneous distribution of incrystalline water in both crystal types at lower pressure.

Water, Adsorption, Microscope and microscopy, Microscopy

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Sticking probability on zeolites

Article Abstract:

The pulsed field gradient NMR diffusion measurements and molecular dynamics simulations show that the typical values of sticking coefficient are close to one. The infrared (IR) uptake measurements indicate that the values of sticking coefficient have high orders of magnitude.

Molecular dynamics

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