Textural properties of porous solids in relation to gas transport

The aim of this study is to compare pore structure characteristics of two i ndustrial catalysts determined by standard methods of textural analysis (ph ysical adsorption of nitrogen and mercury porosimetry) and selected methods for obtaining parameters relevant to transport processes (multicomponent d iffusion and permeation of gases). The Mean Transport Pore Model (MTPM) des cribed diffusion and permeation and the Dusty Gas Model (DGM) described per meation; models (represented as a boundary value problem for a set of ordin ary differential equations) are based on Maxwell-Stefan diffusion equation and Weber permeation law. Parameters of models are material constants of th e porous solid and, thus, do not depend on conditions under which the trans port processes take place. Both catalysts were mono- or bidispersed with me an pore radii about 70 nm and 2000 nm; diffusion and permeation measurement s were performed with four inert gases (H-2, He, N-2, and Ar).