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

Desorption of C
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

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Chemical Reaction Engineering
Mean residence time is equal to the space time, when

There is no change in number of moles in gaseous reaction
All of these
The temperature, pressure and the density of reaction mixture remains constant throughout the reactor
The feed rate is measured at temperature and pressure in the reactor

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