Influence of unsaturated aliphatic and aromatic volatile organic compounds on the oxidation of aqueous sulfur dioxide by oxygen in aqueous medium |
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Authors: | Deepak Singh Rathore Vimlesh Kumar Meena Chandra Pal Singh Chandel Krishna Swarup Gupta |
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Institution: | Atmospheric Chemistry Laboratory, Department of Chemistry, University of Rajasthan, Jaipur, 302004, India |
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Abstract: | The trace atmospheric volatile organic compounds(VOCs) are reported to influence the oxidation of dissolved sulfur dioxide, S(IV), by oxygen, which is an important reaction in atmospheric acid formation. In this work, the influence of 15 VOCs on uncatalyzed oxidation of S(IV) by oxygen has been investigated by following the disappearance of O2]. The inhibition of oxidation reaction by toluene, aniline, benzene, cinnamic acid, hydroquinone, acrylamide, acrylonitrile and allyl alcohol was defined by the rate law(A):kVOC = k0/(1+B Inh]) (A)where, kVOC, and k0 are the first order rate constants in the presence and the absence of VOCs respectively. B is the inhibition parameter and Inh] is the concentration of inhibitor.On the other hand, fumaric, maleic and crotonic acids, which have conjugated CC bonds, catalyze the reaction defined by the rate law(B):kVOC = k0 + kcat VOC] (B)where kcat is catalytic constant and VOC] is the concentration of catalytic VOC.Interestingly, presence of 1-hexene, cyclohexene, methacrylic acid, methyl acrylate was without any significant effect on the rate of reaction. |
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Keywords: | Sulfur dioxide Oxygen Oxidation Kinetics VOCs Inhibition |
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