EFFECT OF TEMPERATURE IN CERIUM-ION-CATALYZED BROMATE-DRIVEN OSCILLATORS

The influence of substrate composition and initial reagent concentrati ons on activation energies in closed Ce-ion catalyzed Belousov-Zhaboti nsky (BZ) reactions is reported. While changes in the initial concentr ations of organic substrate, bromate ion or sulfuric acid showed diffe rent changes in activation energies for the various organic substrate BZ systems, for all systems it was found that lowering the Ce-ion conc entration leads to a significant decrease in the overall activation en ergy of the oscillator. When comparing the performance of a malonic ac id oscillator run in a batch or in a continuous stirred flow reactor ( CSTR), it was found that under CSTR conditions Q(10) Values may become as low as 1.3, while for the batch system the corresponding Q(10) val ues are about 2.3.