OSCILLATIONS AND WAVES IN METAL-ION-CATALYZED BROMATE OSCILLATING REACTIONS IN HIGHLY OXIDIZED STATES

A mathematical model of the Belousov-Zhabotinsky (BZ) oscillating reac tion is presented along with experimental data showing that the cataly st can remain almost completely oxidized during a significant part of the oscillatory cycle in the ferroin-catalyzed BZ reaction. The model semiquantitatively describes oscillations and wave propagation in both the cerium- and ferroin-catalyzed systems when the phase of catalyst oxidation occupies a significant part of the oscillatory cycle. Such m odes are of special interest because they give rise to enhanced instab ility of the bulk oscillations, enlargement of the number of local wav e sources, and decremental wave propagation. Reversibility of the cata lyst oxidation by bromine dioxide radicals is crucial for the dynamics of the system under these conditions.