Abstract
Abstract Temperature dependence of the frequencies in temporal oscillations and of the moving-wave velocities of concentric waves in spatial oscillation in the Belousov-Zhabotinskii reaction was studied in detail using the same starting concentrations of the reactants. When cerium ions were used as catalyst, the activation energies were found to be 60–65 kJ/mol for the temporal oscillation and 46±4 kJ/mol for the spatial oscillation. The difference in the activation energies was well explained by the theoretical prediction based on kinetic-diffusion coupling. When [Fe(phen)32+] or [Fe(bpy)32+] was used as catalyst, the apparent activation energy in the temporal oscillation depends markedly on the concentration of the catalyst used.
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