Kinetics of Isoamyl Alcohol and Aniline Inhibited Uncatalysed and Ag (I) Catalysed Autoxidation of S (IV) in Acidic Medium

In this paper we report that isoamyl alcohol and aniline are good inhibitor for SO₂ oxidation in pH range 4.02-5.25 in the presence of Ag(I). Based on the observed results following rate law given and a free radical mechanism has been proposed. d[S(lV)]/dt = (k₁+k₂[Ag(I)]) [S(lV)]/1 + B [Organics] Experiments were carried out at 30≤T°C≤40, 4.02≤pH≤5.25, 1×10⁻³ mol/cm³≤[S(lV)≤10×10⁻³ mol/cm³, 5×10⁻⁶ mol/cm³≤[Ag(I)]≤2.5×10⁻⁵ mol/cm³, 5×10⁻⁷ mol/cm³≤[Isoamyl alcohol]≤8×10^-3 mol/cm³,5×10⁻⁷ mol/cm³≤[Aniline]≤3×10^-4 mol/cm³. Rate constants and order of reaction were calculated and found pseudo- first order in all cases. The effect of pH and temperature were also discussed. The value of apparent energy were found as 45.16 kJ mol^-1 and 26.43 kJ mol^-1 in the presence of isoamyl alcohol and aniline respectively.