Liquid-phase diffusion and adsorption of pyridine in porous silica-alumina pellets



The adsorption and effective diffusivity of pyridine dissolved in heptane were measured in silica-alumina pellets using a specially developed single-pellet continous-flow diffusion cell. The measured diffusivities varied between 0.43 × 10−9 and 3.25 × 10−9 m2·s−1; the temperature dependence of the diffusivities indicated that both pore volume diffusion and surface diffusion play a role in the mass transfer.