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Textural Properties of Porous Solids in Relation to Gas Transport

O. Šolcová, H. Šnajdaufová, V. Hejtmánek, and P. Schneider

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


Abstract: The aim of this study is to compare pore structure characteristics of two industrial catalysts determined by standard methods of textural analysis (physical adsorption of nitrogen and mercury porosimetry) and selected methods for obtaining parameters relevant to transport processes (multicomponent diffusion and permeation of gases). The Mean Transport Pore Model (MTPM) described diffusion and permeation and the Dusty Gas Model (DGM) described permeation; models (represented as a boundary value problem for a set of ordinary differential equations) are based on Maxwell-Stefan diffusion equation and Weber permeation law. Parameters of models are material constants of the porous solid and, thus, do not depend on conditions under which the transport processes take place. Both catalysts were mono- or bidispersed with mean pore radii about 70 nm and 2000 nm; diffusion and permeation measurements were performed with four inert gases (H2, He, N2, and Ar).

Full paper in Portable Document Format: 536a396.pdf


Chemical Papers 53 (6) 396–402 (1999)

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