Collect. Czech. Chem. Commun. 1998, 63, 1954-1962

Dynamic Gas Transport in Porous Bidispersed Alumina

Vladimír Hejtmánek, Pavel Čapek, Olga Šolcová and Petr Schneider

Institute of Chemical Process Fundamentals, Academy of Sciences of the Czech Republic, 165 02 Prague 6-Suchdol, Czech Republic


A spontaneous temporary rise in the pressure gradient through countercurrent binary transport of inert gases in porous bidispersed alumina was observed in diffusion cell of the Wicke-Kallenbach type. Experimental pressure responses to gas step changes were detected and fitted to a set of partial differential equations. These were based on the transport models Mean Transport Pore Model (MTPM) and Dusty Gas Model (DGM). The dynamic set transport parameters 〈r〉, 〈r2〉 and ψ for both models were obtained using an optimization algorithm and discussed. It was found that the values of the transport radius 〈r〉 are in a good agreement with the mean radius obtained from the measurement of alumina texture.

Keywords: Diffusion; Gas permeation; Porous structure model; Alumina; Porous materials.