D.I. Mendeleev A.M.Butlerov

The velocity of chemical reactions
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Catalysis and inhibition. Additional material.

Simply the mechanism of action of the catalyst can be presented as follows. Change of energy of activation of reaction occurs due to formation by the catalyst K with one of reagents A of an intermediate compound AK:

A + K = AK (1)
AK + B = AB + K (2)

The overall reaction is

A + B = AB

But instead of an energy barrier of this reaction the lower barriers of reactions (1) and (2) have to be overcome: E1 and E2.

Energy diagram



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