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

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Chemical Reaction Engineering
Promoter.

Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals
All of these
Atlers the position of equilibrium in a reversible reaction
Initiates a chemical reaction and is a catalyst by itself

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