On the inflection in the concentration dependence of the Maxwell-Stefan diffusivity of CF4 in MFI zeolite

Article Abstract:

The Maxwell-Stefan diffusivity of CF4 in MFI zeolite shows an inflection at a loading theta = 12 molecules per unit cell, corresponding to the inflection in the adsorption isotherm. The influence behavior of diffusivity is likely to be a generic characteristic of transport in nanoporous materials in which the adsorption of the diffusant occurs on multiple sites with widely different strengths.

Methane

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Pure and multicomponent gas diffusion within zeolite adsorbents: Pulsed field gradient NMR analysis and model development

Article Abstract:

The self-diffusion of gases within 5A- and 13X-type zeolites was investigated using pulsed field gradient (PFG) NMR. It elucidates the effect of gas composition on transport rate by measuring diffusion of the corresponding binary and ternary gas mixtures within these zeolites.

Analysis, Usage, Nuclear magnetic resonance spectroscopy

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Investigation of the negative thermal expansion mechanism of zeolite chabazite using the pair distribution function method

Article Abstract:

A pair of distribution function (PDF) method is used to gain insight into the mechanism of contraction of zeolite chabazite. The main results are obtained from analysis of the differences in the experimental PDFs with temperature and by comparison to optimized structures.

Thermal analysis

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