Chemical Reaction Engineering
The 'E' curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt

At the outlet
At the inlet
In the reactor
Averaged over the inlet and outlet

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Chemical Reaction Engineering
For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rA0 is invariant with total pressure. The rate controlling step is

Surface reaction between absorbed A and absorbed B
Surface Kc/(1 + TS) reaction between absorbed A and B in the gas phase
Surface reaction between A in the gas phase and absorbed B
Desorption of C

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