Kinetics of isoamyl alcohol and aniline inhibited uncatalysed and Ag (I) catalysed autoxidation of S (IV) in acidic Medium

Sharma, Ajay; Sharma, Ravi; Prasad, D. S. N.

doi:10.5958/0974-4150.2017.00040.2

Cited by 3 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As reported by Gupta et al [1] a radical mechanism operates in those reactions in which the inhibition parameter lies in the range 10 3 -10 4 . In this study the value of inhibitor parameter is found to be 10 4 -10 5 , which lies in above the range [26,27]. These results strongly support the radical mechanism.…”

Section: Discussionsupporting

confidence: 81%

“…The nature of the (S(IV))-dependence in presence of carboxylic acid did not change and remained first order. By plotting a graph between 1/K inh v/s (carboxylic acid) gives a linear line with non-zero intercept [23][24][25]. The value of intercept=1/k cat and slope=B/k cat from these values the value of inhibition parameter B can be calculated, inhibition parameter B=slope/intercept (Table 1).…”

Section: Resultsmentioning

confidence: 99%

“…Three reaction pathways are considered to be dominantly responsible for oxidation of SO 2 in atmospheric water droplets. These are the oxidation of dissolved SO 2 by H 2 O 2 , O 3 and O 2 in the presence of transition metal ions as catalysts [6][7][8][9][10]. Recent studies show that the sulfur (IV) oxidation in atmospheric water droplets can be affected by other reactions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Sharma¹,

Ak²,

Dsn

2020

ACSR

View full text Add to dashboard Cite

show abstract

Section: Discussionsupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Sharma¹,

Ak²,

Dsn

2020

ACSR

View full text Add to dashboard Cite

show abstract

“…This strongly supports the radical mechanism for the Co 2 O 3 catalyzed reaction in presence of benzamide. Based on the observed results including the inhibition by benzamide, the following radical mechanism is proposed which similar to that proposed by Manoj et al, 38 Sharma et al, [39][40][41] Sameena et al, 42 in the ethanol inhibition of the CoO catalyzed reaction.…”

Section: Effect Of Temperaturesupporting

confidence: 69%

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

2018

Chem Sci Trans

View full text Add to dashboard Cite

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).

show abstract

Copper Catalyzed Autoxidation of Sulphur Dioxide and Inhibition by Methanoic Acid

Prasad

2020

CPC

View full text Add to dashboard Cite

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.

show abstract

Kinetics of isoamyl alcohol and aniline inhibited uncatalysed and Ag (I) catalysed autoxidation of S (IV) 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

Contact Info

Product

Resources

About