Effect of some organic compounds on The autoxidation of sulfur dioxide in Aqueous heterogeneous medium

Abstract

The role of organic compounds such as isopropyl alcohol, isoamyl alcohol, resorcinol, ethylene glycol has not been studied in CoO calalysed S(IV) autoxidation reactions, although the role of organics and NH3 are well studied. During a vision of the detail that inhibitors help in delineating the mechanism of autoxidation, whether radical or non-radical. We have decided to study the effect of isopropyl alcohol, isoamyl alcohol, resorcinol, ethylene glycol on the autoxidation rates and facilitate understanding of the related mechanism. 2. Alcohols are commonly present in both rural and urban atmospheres. The gas- phase concentration of ethanol and phenol have been reported to be 226 and 2.5ppb respectively. So, we decided to study the inhibition effect of only hydroxy organic compounds which are not studied earlier for S(IV) autoxidation reaction by O2 catalysed with CoO in atmospheric conditions relevant to the Indian subcontinent. 19 3. Contrary our results conclusively exposed that Isopropyl alcohol, Isoamyl alcohol, Ethylene glycol, Resorcinol studied here and they act as an inhibitor but not a catalyst for S(IV) autoxidation . The values of inhibition factor (B) of both uncatalysed and CoO catalysed autoxidation of S(IV) in the presence of these alcohols study here in the range of 103-104 which coincides with earlier reported Begum et al., (2013); Gupta et al., (2008); Meena et al., (2017); Dayal et al., (2014); Hussain et al., (2018), Sharma et al., (2018),(2019). 4. According to the findings of this study, because organic inhibitors are abundant in the environment, their amounts, as well as their influence on the oxidation of aqueous SO2, must be taken into consideration.