Abstract
A chromatographic method for determination of effective diffusion coefficients and transport parameters of porous solids was adapted for Raschig ring-shaped porous pellets. Six samples of γ-alumina Raschig rings differing in density and granulometry of the parent boehmite powder were tested with five inert gas pairs (tracer-carrier). On using the moment method parameters of the mean transport-pore model (mean transport-pore radius r and geometric parameter ψ) for radial diffusion were evaluated and compared with parameters determined recently for axial transport. Large differences between parameter sets for radial and axial mass transport were revealed, pointing to significant anisotropy of the pore structure, in spite of the two-sided compacting process and presence of lubricants during pellet manufacture.
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