Sorption by solids with bidisperse pore structures

✍ Scribed by E. Ruckenstein; A.S. Vaidyanathan; G.R. Youngquist

• Publisher: Elsevier Science
• Year: 1971
• Tongue: English
• Weight: 998 KB
• Volume: 26
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(71)80051-9

✦ Synopsis

A bidisperse model for transient diffusion in porous systems consisting of small spherical particles is presented. Such a model describes sorption in pelletized particles and in some types of molecular sieves and ion exchange resins. Experimental sorption rates in ion exchange resins obtained by the authors and those available in the literature are interpreted by means of the proposed theoretical equation.

A VARIETY of processes exist where diffusion in porous solids is of interest. Important among these are heterogeneous catalytic reactions, adsorption and ion exchange. Porous catalysts, adsorbents and ion exchangers contain irregular networks of pores of various sizes and shapes. The description of transport processes in such solids is inherently difficult owing to the complex and largely unknown nature of the pore network and because, depending on the dimensions of pores, the mechanisms of mass transport may be due to bulk diffusion, Knudsen diffision, and surface diffusion. As a result, most models for diffusion in porous solids are approximate. Many of these have been reviewed elsewhere