Modelling the complex problem of intracrystalline diffusion and first-order phenomena in microporous solid particles under constant-volume/variable-concentration conditions
✍ Scribed by André Micke; Martin Bülow
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 658 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0009-2509
No coin nor oath required. For personal study only.
✦ Synopsis
Abstrrm
-Microporous sol&is w&h pore diameters comparable to e%ctive molecular crows-etiions are mainly used as both stereo-selective adsorlxnts and shape-selective catalysts. Often -piex phenomena govern the overall rate of processes of both physical adsorption and catalytic reaction. Transport and reaction rates an usually determined independently of each other. In contrast to this prwxiure, this paper describes a way to model such phendrnena comptisiq internal d&&n in micraporous particles coupled with any first-order rzti process inherent buth in the physical sysm i.e. sorption system with nonlinear sorption isotherm and any panicle size distribution, and the eqxrimental apparatus characwristicg Modelling and complete solution of the models rqqr both constani and variable boundary conditions were carried out by means of non-linear Volterra integral equations. It bewmea possible to determine both the diffusion coefficients and rate constants of constituents of a complex pro-using only one experimental arrangement. The appro~h is incorporated into the software ZEUS (zeolite uptake simulator). WTPODUCTION