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Abstract

This work deals with the effect of oxygen on basic parameters of the Belousov-Zhabotinskii reaction in the presence of Ce⁴⁺/Ce³⁺ redox catalyst and malonic acid, citric acid, or 2,4-pentanedione as substrates. Oxygen lowers the duration of the induction period and the first oscillation period as well as the corresponding activation parameters. Oxygen lowers also rate constants and activation parameters for oxidation of malonic and citric acids with Ce⁴⁺ ions. It is concluded that the effect of oxygen on the Belousov-Zhabotinskii reaction consists mainly in its catalytic influence on the oxidation of the substrate with Ce⁴⁺ ions.