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

Sharma, Arun Kumar; Parasher, Pradeep; Sharma, Rashmi P.; Prasad, D S N

doi:10.2174/1877946807666170607143955

Cited by 3 publications

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“…Recent studies show that the sulfur (IV) oxidation in atmospheric water droplets can be affected by other reactions. Organic compounds may dissolve into water droplets and react with sulfoxy radicals and transition metal ions, and thus alter the rate of catalytic S(IV) oxidation [11][12][13][14][15]. In most of the studies the role of organics has been reported in the metal ion catalysed autoxidation of sulfur (IV) in aqueous medium [16][17].…”

Section: Introductionmentioning

confidence: 99%

Inhibiting Effect of Different Carboxylic Acid on Uncatalysed and Co2O3 Catalysed Autoxidation of SO2 in Alkaline Medium- Brief Comparision

Sharma¹,

Ak²,

Dsn

2020

ACSR

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Section: Introductionmentioning

confidence: 99%

Inhibiting Effect of Different Carboxylic Acid on Uncatalysed and Co2O3 Catalysed Autoxidation of SO2 in Alkaline Medium- Brief Comparision

Sharma¹,

Ak²,

Dsn

2020

ACSR

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“…The S(IV) autoxidation reaction is known to proceed via both radical and non-radical mechanisms [16][17][18] . An interesting feature of many radical reactions is that, the reaction rate is inhibited by organics such as acetic acid, oxalic acid 19 , alcohols 20 , carboxylic acid 21 , formic acid, isopropyl alcohol, isoamyl alcohol, aniline, benzamide, sodium benzoate [22][23][24][25][26][27] , ascorbic acid 28 , organic compounds 29 , VOC 30 and diesel truck particles 31 .…”

Section: Introductionmentioning

confidence: 99%

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

2018

Chem Sci Trans

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We report that benzamide is a good inhibitor for SO 2 oxidation in the pH range 7.8-9.4 in the presence of Co 2 O 3. Based on the observed results the following rate law is given and a free radical mechanism has been proposed.-d[S(lV)]/dt = (k 1 +k 2 [Co 2 O 3 ]) [S(lV)]/1+B [benzamide]. Experiments were carried out at 30 ≤ T °C ≤ 40, 7.8 ≤ pH ≤ 9.4, 1×10-3 mol/dm 3 ≤ [S(lV)] ≤ 6 × 10-3 mol/dm 3 , 0.1 g/L ≤ [Co 2 O 3 ] ≤ 0.4g/L, 1×10-3 mol/dm 3 ≤ [benzamide] ≤ 5×10-3 mol/dm 3. 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 (E a) energy was determined to be 8.7 kJ mol-1. The activation of energy was calculated by Arrhenius equation. (k = A e-Ea/RT).

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Copper Catalyzed Autoxidation of Sulphur Dioxide and Inhibition by Methanoic Acid

Prasad

2020

CPC

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Background:: Today, acid rain problem is one of the serious global problems to the environment in which pH of the rain water decreases, causing harmful effect to nature, buildings, monuments, vegetation and human being as well. Therefore, the objective of the paper to find out some organic inhibitors present in the atmosphere that inhibited the acid rain. Objective:: In this paper, we studied the chemistry of Cu (II)-methanoic acid-S(IV)-O2 in acetate buffered medium by earlier reported methods in literature. Gravimetric analysis was carried out to find the end product and confirmed that it was sulphate with 98 % recovery. Methods:: Experiments were carried out at 303 ≤ T/K ≤ 313, 4.0 ≤ pH ≤ 5.35, 1.0×10−3 mol/dm3 ≤ S(IV) ≤ 10.0×10−3 mol/dm3, 5×10−6 mol/dm3 ≤ [Cu(II)] ≤ 2.5×10−5 mol/dm3, 6×10−6 mol/dm3≤[methanoic acid]≤7×10-4 mol/dm3. The value of apparent activation energy and inhibition parameter B was calculated in the presence of methanoic acid found as 29.07 kJ mol-1and 3.18 x 103 mol dm-3, respectively. The thermodynamic parameters were found as frequency factor (1.59 x 10-6s-1), entropy (-358.92 J K-1 mol-1), enthalpy (20.97 k J mol-1), and Gibbs free energy (172.83k J mol-1), respectively. Results:: We observed that methanoic acid acts as an inhibitor in copper catalyzed autoxidation of SO2 in acidic medium. Therefore, on the basis of the observed results a free radical mechanism has been identified. The results are useful for modeling rain water acidity and therefore a great use of meteorology and atmospheric chemistry. This study is important in understanding the mechanism of the oxidation of S(IV) by O2. Conclusion:: This study suggests that since organic inhibitors are found in the atmosphere, their concentrations and their influence on the oxidation of aqueous SO2 should be taken into account. The intervention of methanoic acid in the autoxidation of aqueous SO2 plays a role in deciding the fate of both methanoic acid and SO2. The influence of inhibitors may be used to calculate the lifetime of SO2, Methanoic acid has high values of kinh and, therefore, it would be degraded by sulfate radical anions in atmospheric waters.

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

Cited by 3 publications

References 0 publications

Inhibiting Effect of Different Carboxylic Acid on Uncatalysed and Co2O3 Catalysed Autoxidation of SO2 in Alkaline Medium- Brief Comparision

Inhibiting Effect of Different Carboxylic Acid on Uncatalysed and Co2O3 Catalysed Autoxidation of SO2 in Alkaline Medium- Brief Comparision

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

Copper Catalyzed Autoxidation of Sulphur Dioxide and Inhibition by Methanoic Acid

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