Effectiveness of bidisperse catalysts
Journal Article
·
· AIChE J.; (United States)
An equation for the effectiveness factor for an isothermal first-order reaction taking place in a bidisperse spherical catalyst pellet has been derived, which shows the dependence of this factor on the magnitude of a parameter ..cap alpha.., which depends mainly on the ratio of diffusion times in the macro and micropore regions and on the Thiele modulus. For most practical catalysts, the value of ..cap alpha.. lies between 1 and 1000. The ratio of effectiveness factor values determined by the present model and by the conventional method for monodisperse catalysts, which method is based only on the Thiele modulus, increased from 0.74:1 at ..cap alpha.. = 1 to 0.92:1 at ..cap alpha.. = 1000. At a fixed value of ..cap alpha.., the ratio decreases as the Thiele modulus increases. The present approach can also be applied to nonisothermal systems and to other pellet geometries.
- Research Organization:
- Middle East Tech. Univ.
- OSTI ID:
- 6811803
- Journal Information:
- AIChE J.; (United States), Journal Name: AIChE J.; (United States) Vol. 25:4; ISSN AICEA
- Country of Publication:
- United States
- Language:
- English
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