Effectiveness Factor Bimolecular Langmuir-Hinshelwood Kinetics

14 Effectiveness Factor Bimolecular Langmuir-Hinshelwood Kinetics 

The following reaction is carried out in a cylindrical catalyst pellet A + 2B- P 

The kinetic expression for this reaction is given by Equation 9.16. Further data are k = 1 m3 mole1 s4 KA = 0.1 m3 mole4 K = 1 m3 mole4 CAj = 2 mole m4 CBt = 5 mole m4. The pellet dimensions are 4 mm height by 4 mm diameter. The effective diffusion coefficients of A and B are 2 xlO 7 m2 s4 and 3 xlff7 m2 s4, respectively. We wish to calculate the effectiveness factor. 

The characteristic pellet dimension VJAp is 213 nun. For the Aris numbers we find  

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Figure 20. Effectiveness factor rj for a bimolecular irreversible reaction with Langmuir Hinshelwood-type kinetics versus the Weisz modulus ip. Influence of intraparticle diffusion on the effective reaction rate (isothermal reaction in a flat plate, modified stoichiometric excess E — 10, Kp it as a parameter, adapted from Satterfield [91]).

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