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  • Chem Sci Trans., 2018, 7(4),  pp 600-609  

    DOI:10.7598/cst2018.1524

    Research Article

    Co2O3 Catalyzed Oxidation of SO2 in Aqueous Solution Differing Effect of Benzamide in Alkaline Medium

  • FAIYAZ HUSSAIN, SAMEENA BEGAM, ARUN KUMAR SHARMA and D. S. N. PRASAD*
  • Department of Chemistry, Govt. P. G. College, Jhalawar- 326001, Rajasthan, India
  • Abstract

    We report that benzamide is a good inhibitor for SO2 oxidation in the pH range 7.8-9.4 in the presence of Co2O3. 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[Co2O3]) [S(lV)]/1+B [benzamide]. Experiments were carried out at 30 ≤ T ?C ≤ 40, 7.8 ≤ pH ≤ 9.4, 1?10-3 mol/dm3 ≤ [S(lV)] ≤ 6 ? 10-3 mol/dm3, 0.1 g/L ≤ [Co2O3] ≤ 0.4g/L, 1?10-3mol/dm3 ≤ [benzamide] ≤ 5?10-3 mol/dm3. Rate constants and the order of reaction were calculated and the reaction was found to be pseudo-first order in all cases. The effect of pH and temperature are also discussed. The value of apparent activation (Ea) energy was determined to be 8.7 kJ mol-1. The activation of energy was calculated by Arrhenius equation. (k = A e-Ea/RT).

    Keywords

    Kinetics, Autoxidation, SO2, Co2O3, Catalysis, Inhibition, Benzamide

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