A microcalorimetric comparison of the effect ofn-alkane preadsorption on the adsorption of argon and nitrogen on Silicalite-I |
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Authors: | N. Pellenq P. L. Llewellyn Y. Grillet J. Rouquerol |
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Affiliation: | 1. C.T.M. du C.N.R.S., 26 rue du 141e R.I.A., 13003, Marseille, France 2. Inst. für Anorg. and Analyt. Chemie. Joh. Gutenberg Universit?t, D-55128, Mainz, Germany
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Abstract: | Then-alkanes of different lengths were preadsorbed to selectively block part of the micropores of a MFI-type zeolite, Silicalite-I. The porosity available to argon and nitrogen was then studied by quasi-equilibrium adsorption microcalorimetry and volumetry at 77K and compared to what was found for the bare zeolite. Indeed, although partial adsorption ofn-alkanes does not alter the value of the differential enthalpies of adsorption for both argon and nitrogen, then-butane preadsorption diminishes the adsorption capacity by inducing inaccessible volumes in the micropore network. Moreover, the microcalorimetric experiments clearly show thatn-butane is not evenly distributed in the zeolite channel network while the longern-alkanes used are. |
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Keywords: | n-alkanes preadsorption microcalorimetry Silicalite-I |
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