Study on the non-catalyzed oscillating reaction of dark tea-KBrO₃–H₂SO₄ system

A new kinetic study of the uncatalyzed bromate oscillator using dark tea without pre-treatment was carried out. The difference of dark tea oscillating system with and without manganese ion as catalyst was compared. The reaction was studied with different starting concentrations of the reagents (sulfuric acid and potassium bromate) and the substrate of dark tea, and the results indicate that the concentration of dark tea has a wide range between 1 with 30 g/L in dark tea-KBrO₃-H₂SO₄ system, the lowest concentration of potassium bromate and sulfuric acid are 0.028 mol/L and 0.24 mol/L. The effects of the temperature were also investigated and the activation energy of oscillation was calculated to 88.78 kJ/mol. In addition, the possible mechanism of the non-catalyzed oscillating reaction was also discussed briefly.