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

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Chemical Reaction Engineering
An endothermic aqueous phase first order irreversible reaction is carried out in an adiabatic plug flow reactor. The rate of reaction

Goes through a maximum along the length of the reactor
Is maximum at the exit of the reactor
Is maximum at the inlet of the reactor
Goes through a minimum along the length of the reactor

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