Chemical Reaction Engineering
A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and kg respectively. The effective rate constant (keff) is given by

keff = (k+ kg)/2
keff = k + kg
1/keff = 1/k + 1/kg
keff = (kkg)1/2

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Chemical Reaction Engineering
A trickle bed reactor is the one, which

Has altogether three streams either entering or leaving
Processes three reactants with same flow rate
Employs all the three phases (i.e.. .solid, liquid and gas)
Processes three reactants at different flow rates

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