Surface-catalyzed autoxidation of sulfur(IV) in aqueous silica and copper(II) oxide suspensions

Prasad, D. S. N.; Rani, Ashu; Gupta, K. C.

doi:10.1021/es00031a013

Cited by 30 publications

(13 citation statements)

References 18 publications

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“…The experimental procedure was exactly the same as described earlier [19][20][21][22][23] and is briefly given here. All chemicals used were of reagent grade and their solutions were prepared in double distilled water.…”

Section: Methodsmentioning

confidence: 99%

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Kinetics of iron(III)-catalyzed autoxidation of sulfur(IV) in acetate buffered medium

Manoj

Mudgal

Gupta

2007

Transition Met Chem

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The kinetics of the environmentally important oxidation of sulfur(IV) by oxygen in acetate buffered medium in the presence of Fe(III) and the pH range 5.27-5.70 has been studied. The results were in agreement with the rate law:The role of iron(III) appears to be that of production of SO 3 -radicals in Fe(III)SO 3 2-complex by an internal 1-equivalent redox reaction. Subsequently, a radical mechanism involving oxysulfur radicals, viz., SO 3 -, SO 4 -, and SO 5 -operates. Addition of ethanol leads to the introduction of an induction period and decrease in reaction rate, most likely due to scavenging of SO 4 -radicals. The value of apparent energy of activation is 45.4 kJ mol -1 .

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Section: Methodsmentioning

confidence: 99%

“…The kinetics was followed by withdrawing the aliquot samples periodically and titrating the unreacted S(IV) iodometrically in slightly acidic medium as described earlier [19][20][21][22][23].…”

Section: Methodsmentioning

confidence: 99%

Kinetics of iron(III)-catalyzed autoxidation of sulfur(IV) in acetate buffered medium

Manoj

Mudgal

Gupta

2007

Transition Met Chem

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“…Prasad & Gupta et al [11,37] proposed a similar mechanism for the Co 2 O 3 and CoO catalysed autoxidation of SO 2 inhibited by formic acid and ethanol respectively, which lead to the same rate law. By comparing derived rate law with the experimental rate law we observe the similarity in these two.…”

Section: Hso H Somentioning

confidence: 95%

“…Both non radical and radical mechanism have been proposed. The atmospheric oxidation of SO 2 by O 2 in aqueous media has been the subject of numerous studies, and the subject matter of several reviews, monographs and papers, notably by Kuo et al [1][2][3][4][5][6][7][8][9][10][11]. It is interesting to point out that reaction is strongly inhibited by alcohol, benzene, and other compounds.…”

Section: Introductionmentioning

confidence: 99%

The Inhibitive Action of Aniline on the Autoxidation of Sodium Sulfite in Acidic Medium

Sharma¹

2017

JAPLR

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The kinetics of atmospheric autoxidation of S (IV) by Ag(I) at pH 4.02-5.25 has been studied. The aqueous phase autoxidation of S (IV) is the major factor responsible for acidification of atmospheric aqueous system. The role of Aniline act as an inhibitor of Ag(I) catalysed autoxidation of S(IV) in acidic medium has been identified, and based on the observed results following rate law given and a free radical mechanism has been proposed.( )

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“…A similar observation was made by Lunak et al [23] with 2-propanol at pH 8.5. On the other hand, in the heterogeneous CuO-catalyzed autoxidation of sulfur(IV) [27], the inhibition effect of ethanol was found to be small [36] and could be due to competitive adsorption on CuO surface.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of copper(II)‐catalyzed oxidation of S(IV) by atmospheric oxygen in ammonia buffered solutions

Sharma

Singh

Mehta

et al. 2011

Int J of Chemical Kinetics

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To understand the chemistry of Cu(II)-NH 3 -S(IV)-O 2 system, the kinetics of the oxidation of sulfur(IV) catalyzed by amminecopper(II) complexes has been studied in the ammonia-buffered solutions. Sulfur(IV) is oxidized to sulfate. The complexes, Cu(NH 3 ) 2+ , Cu(NH 3 ) 2+ 2 , and Cu(NH 3 ) 2+ 3 appear to be equally reactive and Cu(NH 3 ) 2+ 4 appears to be unreactive. The kinetics obey the rate law: 2+ 3 complexes, which appear to be equally reactive. The values of α 1 and γ 1 were found to be (1.32 ± 0.21) × 10 6 L 2 mol −2 s −1 (1.74 ± 0.40) × 10 9 L 3 mol −3 s −1 respectively at 30 • C. The reaction rate is not influenced by the presence of ethanol-a free radical scavenger, so a nonradical mechanism has been proposed. The results of this study are useful in understanding the atmospheric chemistry of aqueous phase autoxidation of dissolved sulfur dioxide in copper(II)-ammonia-sulfur(IV)-oxygen system at high pH. C

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Surface-catalyzed autoxidation of sulfur(IV) in aqueous silica and copper(II) oxide suspensions

Cited by 30 publications

References 18 publications

Kinetics of iron(III)-catalyzed autoxidation of sulfur(IV) in acetate buffered medium

Kinetics of iron(III)-catalyzed autoxidation of sulfur(IV) in acetate buffered medium

The Inhibitive Action of Aniline on the Autoxidation of Sodium Sulfite in Acidic Medium

Kinetics of copper(II)‐catalyzed oxidation of S(IV) by atmospheric oxygen in ammonia buffered solutions

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