Permeation of single gases in thin zeolite MFI membranes


Burggraaf, A.J. and Vroon, Z.A.E.P. and Keizer, K. and Verweij, H. (1998) Permeation of single gases in thin zeolite MFI membranes. Journal of Membrane Science, 144 (1-2). pp. 77-86. ISSN 0376-7388

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Abstract:The permeation of a series of gases with widely different Lennard-Jones kinetic diameters and sorption properties is investigated as a function of feed pressure (up to 100 kPa) and temperature (298–473 K) with two different methods. The membrane system studied consists of an MFI (silicalite) top-layer (thickness 3 μm) directly grown on an -alumina support. Flux values of molecules with a kinetic diameter, dk, <0.45 nm (H2, CO2 and n-alkanes (CH4 to n-butane)) are in the range of 1.5–15 mmol m−2 s−1. Size exclusion is found for o-xylene (dk=0.68 nm) and 2,2-dimethylbutane (dk=0.60 nm). Flux values are obtained for iso-butane, SF6 and benzene, intermediate between those for small molecules and those for molecules with size exclusion. Maxima in the curve of flux versus temperature are found for gases with non-linear Langmuir-type adsorption curves as a function of pressure. The temperature of maxima at 100 kPa pressure increases in the order of CO2<ethane<propane<butane and shifts to higher values with increasing pressure.

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Copyright:© 1998 Elsevier Science
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Metis ID: 106523