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- W1970348565 abstract "A novel method of measuring diffusion in small (micron-sized) zeolite crystals has been developed based on measurement of the chromatographic response for a capillary column, the internal surface of which is coated with an incomplete monolayer of the zeolite crystals. Special techniques are needed to prepare such a column; in the commercially available wall-coated zeolite columns the surface coverage of the zeolite crystals is too low to permit reliable diffusion measurements. A theoretical expression giving the HETP (height equivalent to a theoretical plate) as a function of gas velocity, based on a modification of Golay's analysis for a liquid-coated capillary column, has been derived. As in conventional chromatography, the HETP is governed by the sum of the contributions from axial dispersion and mass transfer resistance, but, in contrast to conventional chromatography, the axial dispersion contribution for a wall-coated column can be confidently estimated a priori. The relative importance of intercrystalline and external diffusion resistances depends inter alia on the ratio of tube to particle diameters. The advantage of the technique arises because it is possible to make reliable measurements of the intracrystalline diffusivity, even for relatively fast systems, by using a sufficiently small tube diameter. The validity of the method is tested by measuring the diffusion of n-butane in small commercial 5A zeolite crystals. In contrast to other macroscopic techniques which, for this system, generally yield rather low apparent diffusivity values, the values we obtain are close to the self-diffusivities obtained from p.f.g. n.m.r. measurements and the macroscopically measured transport diffusivities for large laboratory synthesized crystals." @default.
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- W1970348565 date "1995-01-01" @default.
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- W1970348565 title "Measurement of diffusion in small 5A zeolite crystals using a wall-coated capillary column" @default.
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- W1970348565 doi "https://doi.org/10.1016/0144-2449(94)00026-o" @default.
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