Analysis of Three-Phase Catalytic Reactions

ANALYSIS OF THREE-PHASE CATALYTIC REACTIONS The Basis 

All of our analyses will be based on the use of Equation 17.1 and a generalized Thiele modulus. We consider both power law and LHHW kinetics. 

The coefficient A gl,a represents the overall effect of gas- and liquid-side mass transfer and is given by 

It is important to note that only regimes 1 and 2 of gas absorption accompanied by a simple reaction (Chapter 14) are operative here. Because the reaction occurs only on the solid surface (or within it), regimes 3 and 4 for reaction in the liquid film do not apply. An exception would be when the solid enters the gas-liquid film as a microphase. The behavior of microphases in general is analyzed in Chapter 23. 

Consider reaction 17.1 again, and assume that the concentration [5] of the liquid-phase reactant remains constant (i.e., the reaction is pseudo-order). The rate equation in the presence of diffusional resistance in the catalyst can be written as 

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