Sorption and 13C NMR experiments

Article Abstract:

The sorption properties of linear alkanes in zeolite ferrierite were investigated using heat of adsorption, 13C nuclear magnetic resonance (NMR), adsorption isotherm and temperature-programmed desorption measurements. 13C NMR measurements showed that only short alkanes can access the entire two-dimensional pore structure of ferrierite and that only long alkanes adsorbed only in the 10-ring channels. Temperature-programmed desorption measurements showed that propane and n-butane have easy access to the complete pore structure.

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Adsorption of linear alkanes in the alpha-cages and gamma-cages of H-ZK-5 and K-ZK-5

Article Abstract:

13C NMR spectroscopy and molecular simulations were used in studying the adsorption of linear alkanes in the alpha- and gamma-cages of H-ZK-5 and K-ZK-5 zeolites. Results indicated that alkane molecules up to n-heptane could adsorb in both cages of the two zeolites. However, the adsorption of longer alkane molecules is limited to the alpha-cages only because the gamma-cages have smaller sizes. Propane and n-butane prefer to adsorb in the gamma-cages because of its better heat of adsorption.

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Calorimetric study of adsorption of alkanes in high-silica zeolites

Article Abstract:

A study was conducted to analyze the adsorption of alkanes in high-silica zeolites by calorimetry. Powder samples were pressed into thin wafers to prevent the accumulation of dust. Zeolites were then heated under vacuum from room temperature to 110 degrees C. Results indicated that the zero-coverage heats of adsorption were inversely proportional to the pore diameter and correlated with a smoothed integration for short-range van der Waals interactions.

Usage, Calorimeters

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