Elements of
Chemical Reaction Engineering
6th Edition



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Essentials of
Chemical Reaction Engineering
Second Edition

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Chapter 15: Diffusion and Reaction in Porous Catalysts

Additional Homework Problems

CDP15-KB

  The oxidation of ethanol is to be carried out in a trickle bed reactor. The reaction is first-order with respect to oxygen and zero-order with respect to ethanol. The reactor is 30 cm in diameter and 6 m long and the bed porosity is 40%. The Pd/Al 2 O catalyst pellets are 0.5 cm in diameter and have a density of 1800 kg/m 3 . The diffusivity of oxygen in ethanol is 4 x 10 -10 m2 /s and the equilibrium solubility is 4 x 10 -2 kmol/m3 at reaction conditions. The superficial gas velocity is 10 cm/s and the corresponding pressure gradient is 30 kPa/m. The superficial liquid-phase velocity is 0.25 cm/s. The specific reaction rate is 0.03 s -1 . Tortuosity = 3.9,xi]p = 0.6,sigma= 0.8.
     
    (a) Calculate the percent of the total resistance for each transport step.
(b) Determine the conversion of ethanol.
(c) Assuming an axial dispersion coefficient of 0.02 cm 2/s, determine if the plug-flow model was a good assumption.

[2nd Ed. P12-9]