Optimal catalyst activity profile in pellets with shell-progressive poisoning: the case of fast linear kinetics
✍ Scribed by Stavros Pavlou; Costas G. Vayenas
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 760 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0009-2509
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✦ Synopsis
The problem of determining the optimal catalyst activity profile in isothermal pellets subject to shell-progressive poisoning has been solved analytically for linear kinetics and large Thiele moduli. Using the asymptotic effectiveness factor expressions of Yortsos and Tsotsis (Chem. Engng Sci. 37, 237-243, 1982) for nonuniformly impregnated pellets and variational calculus methods, optimal catalyst profiles have been determined for flat, cylindrical and spherical pellets. They correspond to smooth bimodal-type distributions. Catalyst performance of optimally impregnated pellets is compared with the performance of pellets with uniform and Dirac-type distributions.