Effect of Aliphatic Mono Carboxylic acids and alcohols on Silver (I) Catalyzed oxidation of SO_2 in aqueous solution

In this paper we report the comparative study of formic acid and isopropyl alcohol on SO_2 oxidation in pH range 4.02-5.25 in the presence of silver (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/dm³≤[S(lV)≤10×10−³mol/dm³,5×10−⁶mol/dm³≤[Ag(I)]≤2.5×10−⁵mol/dm³,5×10−⁶ mol/dm³≤[Formic acid]≤8×10⁻⁴mol/dm³,5×10−⁷mol/dm³≤[ Isopropyl alcohol]≤8×10⁻⁴ mol/dm³. 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 79.3 kJ mol⁻¹ and 79.83 kJ mol⁻¹in the presence of propyl alcohol respectively.