Abstract
Similar expressions to those derived before for both exact and approximate limits to first-order kinetics are shown to apply to systems which follow pseudomonomolecular kinetics. A more rigorous derivation of the approximate limits is given. The treatment is extended to some multicomponent systems displaying pseudo-mass-action kinetics. In all cases the approximate constraints on rate constants are those which would be derived if the Principle of Microscopic Reversibility could be applied in regions away from equilibrium. Previous work on three catalysed reactions (sulphur dioxide oxidation, water-gas shift, and methanol synthesis), in which the catalyst is not a constant entity across the composition space, is shown to be in accord with theory.
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