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The role of explosion limit kinetics is explored by applying three different explc, sion limits to detonation waves traveling at a critical Mach number in stoiehiometrie mixture of H:-COO 2. Such waves are achieved by subjecting normal Chapman-Jouguet waves to a gaseous boundary and bringing them to a critical veloeit~t below which quenching would re/mlt. It is found that the critical velocities can be explained by the explos:on limit adv,~nced by Minkoff and Tipper when recent applicable rate constants (slightly modified) are used. In addition, this explosion limit seems to give a reasonable prediction of the lean detonation limit of CO-H,-O,, mixtures, although it fa~ls to agree with the experimental evidence at the rich detonation limit end found in the literature,