Theory 119/Catalyst cycle/Progression phase
Activity Loss Is Site Against Access
The claim
Activity falls at a rate set by the ratio of site poisoning to pore blockage, so two catalysts with the same coke load differ in decay.
01Mechanism
Sites can be poisoned or made inaccessible; the ratio determines the dominant loss.
02Prediction
Decay should track the ratio.
03Refutation
Decay tracking coke quantity would remove accessibility.