In our preceding paper, we showed that cobalt substituted aluminophosphate molecular sieves can be successfully employed as active and truly heterogeneous autoxidation catalysts [D.L. Vanoppen, D.E. De Vos, M.J. Genet, P.G. Rouxhet, P.A. Jacobs, Angew. Chem., Int. Ed. Eng. 35 (1995) 560]. These solid catalysts show a higher selectivity for cyclohexyl hydroperoxide and an improved overall selectivity for mono-oxygenates when compared to a classic homogeneous cobalt naphthenate catalyst. In this paper, oxygen uptake curves of the homogeneous and heterogeneous catalyzed reactions are fitted to a simplified kinetic expression. The solid catalysts exhibit a markedly different kinetic behavior when compared to the classic homogeneous catalyst. This difference in reaction kinetics may indicate a different reaction mechanism, but may be accounted for equally well by effects of sorption, competitive sorption and diffusion that are inherent to heterogenization of the cobalt ion on a microporous support. Finally, this difference in kinetic behaviour explains the higher peroxide selectivity and overall selectivity that were observed using these heterogeneous catalysts.