Rational approximations of effectiveness factor and general diagnostic criteria for heat and mass transport limitations
Many efforts have been made to predict the effect of diffusion on the observed rate of reaction and its role in modifying the activity and selectivity of porous catalysts. The discussion of rational approximation predicts the effect of diffusional phenomena on the overall rate of reaction under a great variety of circumstances and shows how some part of the theoretical development can be used to deduce two general criteria to establish the conditions where diffusional phenomena can be safely neglected. The reviewed approximations give accurate results with minimal computational effort as long as multiplicity is absent. The expression is given that accurately predicts effectiveness factor values under isothermal conditions provided the apparent reaction order is greater than 0.5. Expressions have been previously reported that are applicable under nonisothermal conditions. The review of the 54 references was devoted to the single reaction case because not much work has been done on complex reaction systems. (BLM)
- Research Organization:
- Instituto de Investigaciones para la Industria Quimica, Buenos Aires, Argentina
- OSTI ID:
- 5960624
- Journal Information:
- Catal. Rev., Sci. Eng.; (United States), Vol. 25:1
- Country of Publication:
- United States
- Language:
- English
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