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Effectiveness factors for pellet with step-distribution of catalyst

✍ Scribed by Jenshi B. Wang; Arvind Varma

Publisher
Elsevier Science
Year
1978
Tongue
English
Weight
340 KB
Volume
33
Category
Article
ISSN
0009-2509

No coin nor oath required. For personal study only.

✦ Synopsis

In tlus connectlon It IS a strmghtforward matter to show that EC (7) IS an exact representation for Enhancement at the limits of slow and fast reaction This LS because It can be denved by assummg that the species k 1s constant and equal to the concentration of k at the Interface, at least up to the posltion where substance A ddfuses The predictlons of eqn (7) are presented m l5gs 8-10, where they can be compared duectly with the numerlcal solute-Ions for the film and penetrahon theories

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Tke dusty gas model is used to establish the effects of temperature and pressure gradients on catalyst pellet effectiveness factors for reaction systems in which species molecular weights and transport coefficients are indistinguishable and Lui = 0. For this class of reactions, the total molar flux

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Existence of multiple steady states and sustained oscillations in catalyst pellet with Dirac delta activity distribution and bimolecular reaction with Langmuir-Hinshelwood rate expression is numerically established. In addition it is shown that deactivation may lead to temporary oscillations.