Concentration-dependent micropore diffusion analysed by measuring laboratory adsorber dynamics—II. Study of the micropore diffusion mechanism

✍ Scribed by R. Gutsche

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 608 KB
• Volume: 48
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(93)81030-y

✦ Synopsis

On the basis of the flow study presented in Part I the desorption behaviour of the isobaric laboratory adsorber is investigated. The investigation is suitable to identify the micropore diffusion mechanism of NH3 molecules in A-type zeolite crystals. The sorption system is characterized by the fact that the diameter of diffusing molecules is of the same magnitude as the micropore diameter. For such systems, Gutsche et al. predicted the concentration dependence of Fickian diffusivity to obey the relation D, = D,, da/dq. This relation is a special form of a more general equation derivable from transition state theory. In the present work. the concentration dependence of NH, digusivities is found to satisfy the above relation. With this result, an experimental support for the prediction of Gutsche et al. is provided.