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Ag (I) Catalyzed Oxidation of SO2 in Aqueous Solution Differing Effect of Benzoate Ions in Acidic Medium

[ Vol. 7 , Issue. 4 ]

Author(s):

Arun Kumar Sharma*, Pradeep Parasher, Rashmi Sharma and Davarakonda S.N. Prasad   Pages 338 - 347 ( 10 )

Abstract:


Aim: In this paper, we report that sodium benzoate is a good inhibitor for SO2 oxidation in the pH range 4.02-5.25 in the presence of Ag (I). Based on the observed results the following rate law is given and a free radical mechanism has been proposed.

-d[S(lV)]/dt = (k1+ k2[Ag(I)]) [S(lV)]/1 + B [Sodium Benzoate]

Methods: 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, 8×10−8 mol/cm3≤ [Sodium Benzoate]≤2×10-4 mol/cm3.

Observation: Rate constants and the order of reaction were calculated and the reaction was found to be pseudo- first order in all cases.

Result: The effect of pH and temperature are also discussed. The value of apparent activation (Ea) energy was determined to be 24.11 kJ mol-1. The activation of energy was calculated by Arrhenius equation (k = A e-Ea/RT).

Keywords:

Kinetics, autoxidation, SO2, Ag(I), catalysis, inhibition, sodium benzoate.

Affiliation:

Department of Chemistry, Govt. P.G. College, Jhalawar- 326001, Rajasthan, Department of Chemistry, Govt. P.G. College, Jhalawar- 326001, Rajasthan, S.P.C. Govt. College, Ajmer- 305001, Rajasthan, Department of Chemistry, Govt. P.G. College, Jhalawar- 326001, Rajasthan

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