Kinetics of autoxidation of aqueous sulphur dioxide in suspensions of nickel(III) oxide

Bhargava, Rama; Prasad, D. S. N.; Rani, Ashu; Bhargava, Pinky; Jain, Usha; Gupta, K. C.

doi:10.1007/bf02910846

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…The major aim of this study was to examine the effect of organic inhibitors on the reaction rate, benzamide was chosen as the third inhibitor. On increasing the concentration of benzamide from 1×10 -3 mol dm -3 to 5×10 -3 mol dm -3 (5) In accordance with Eq. 5 the plot of 1/ k inh vs.…”

Section: Dependence Of Sulphitesupporting

confidence: 77%

“…The metal oxides are released to the atmosphere as a result of combustion processes are therefore important constituents of suspended particulate matter. The catalytic role of several metal oxides such [3][4][5][6][7][8] as CoO; Co 2 O 3 ; Ni 2 O 3 ; CuO; MnO 2 and Cu 2 O; waste product of water treatment plants containing 9,10 CaO cobalt ions 11 and carbon nanotubes 12 , transition metal catalyst 13 and cobalt based molecular sieves 14 has been reported. Conklin and Hoffman 15 proved that the liquid phase oxidation of SO 2 has been established as a major pathway in the biogeochemical sulfur cycle and in the production of acidity in the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Dependence Of Sulphitesupporting

confidence: 77%

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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“…The oxidation of sulfur(IV) by both HSO 5 -[28] and H 2 O 2 [29] is known to be fast and similar nonradical mechanisms have been proposed earlier [8,19], including Ni 2 O 3 -catalysis in acid medium [4]. Thus, for Ni 2 O 3 , the same nonradical mechanism appears to operate in both acidic and alkaline media.…”

Section: Ni 2 O 3 -Catalysismentioning

confidence: 76%

“…This indicates the operation of a radical mechanism involving oxysulfur free radicals, viz., SO 3 -, SO 4 -and SO 5 - [17,18]. The inhibition is caused mainly through scavenging of SO 4 -by inhibitors such as ethanol and benzene [17]. In this regard, the inhibition parameter, C, provides some insight about the mechanism [10,[14][15][16][17][18]23].…”

Section: Coo and Co 2 O 3 Catalysesmentioning

confidence: 97%

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Kinetics of the uninhibited and ethanol-inhibited CoO, Co2O3 and Ni2O3 catalyzed autoxidation of sulfur(IV) in alkaline medium

Gupta

Mehta

Sharma

et al. 2008

Transition Met Chem

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The influence of diesel—truck exhaust particles on the kinetics of the atmospheric oxidation of dissolved sulfur dioxide by oxygen

Meena

Dhayal

Saxena

et al. 2016

Environ Sci Pollut Res

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The automobile exhausts are one of the major sources of particulate matter in urban areas and these particles are known to influence the atmospheric chemistry in a variety of ways. Because of this, the oxidation of dissolved sulfur dioxide by oxygen was studied in aqueous suspensions of particulates, obtained by scraping the particles deposited inside a diesel truck exhaust pipe (DEP). A variation in pH showed the rate to increase with increase in pH from 5.22 to about ∼6.3 and to decrease thereafter becoming very slow at pH = 8.2. In acetate-buffered medium, the reaction rate was higher than the rate in unbuffered medium at the same pH. Further, the rate was found to be higher in suspension than in the leachate under otherwise identical conditions. And, the reaction rate in the blank reaction was the slowest. This appears to be due to catalysis by leached metal ions in leachate and due to catalysis by leached metal ions and particulate surface both in suspensions. The kinetics of dissolved SO2 oxidation in acetate-buffered medium as well as in unbuffered medium at pH = 5.22 were defined by rate law: k obs = k 0 + k cat [DEP], where k obs and k 0 are observed rate constants in the presence and the absence of DEP and k cat is the rate constant for DEP-catalyzed pathway. At pH = 8.2, the reaction rate was strongly inhibited by DEP in buffered and unbuffered media. Results suggest that the DEP would have an inhibiting effect in those areas where rainwater pH is 7 or more. These results at high pH are of particular significance to the Indian subcontinent, because of high rainwater pH. Conversely, it indicates the DEP to retard the oxidation of dissolved SO2 and control rainwater acidification.

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Kinetics of autoxidation of aqueous sulphur dioxide in suspensions of nickel(III) oxide

Cited by 8 publications

References 13 publications

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

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

Kinetics of the uninhibited and ethanol-inhibited CoO, Co2O3 and Ni2O3 catalyzed autoxidation of sulfur(IV) in alkaline medium

The influence of diesel—truck exhaust particles on the kinetics of the atmospheric oxidation of dissolved sulfur dioxide by oxygen

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