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

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

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Chemical Reaction Engineering
The rate of the heterogenous catalytic reaction A(g) + B(g) ? C(g) is given by -rA = k.KA.pA.PB/(1 + KA.PA + Kc.pc), where KA and Kc are the adsorption equilibrium constants. The rate controlling step for this reaction isA. absorption of A.

Surface reaction between absorbed A and absorbed B
Surface reaction between absorbed A and B in the gas phase
Absorption of A
Surface reaction between A in the gas phase and absorbed B

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