Kinetics of ammonia and ammonium ion inhibition of the atmospheric oxidation of aqueous sulfur dioxide by oxygen

Mudgal, Punit K.; Sharma, Anil Kumar; Mishra, C. P.; Bansal, Seema; Gupta, K. C.

doi:10.1007/s10874-009-9123-8

Cited by 15 publications

(26 citation statements)

References 72 publications

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“…Nickel(II) sulfate (BDH), ammonia (Rankem), and all other chemicals used were of reagent grade, and their solutions were prepared in double‐distilled water. The experimental procedure, which was exactly the same as described earlier by Brodzinsky et al 18 and subsequently used by us 1,19, is briefly given here. The reactions were conducted in 0.15‐L Erlenmeyer flasks, open to air, to allow the passage of atmospheric oxygen.…”

Section: Methodsmentioning

confidence: 99%

“…In a recent study 1, ammonia was found to inhibit strongly the oxidation of sulfur(IV) by O 2 , which is known to proceed via a radical mechanism involving oxysulfur radicals, viz., SO

_{3}^{−}

, SO

_{4}^{−}

, and SO

_{5}^{−}

2–6, in alkaline solutions. An ammonia concentration of 1 × 10 −2 mol L −1 completely seized the reaction.…”

Section: Introductionmentioning

confidence: 99%

“…An ammonia concentration of 1 × 10 −2 mol L −1 completely seized the reaction. However, the addition of nickel(II) at pH 9.0 revived the reaction, indicating the reaction to occur via a different mechanism not involving oxysulfur radicals 1, and this led us to look into the system in detail.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of the simultaneous oxidation of nickel(II) and sulfur(IV) by oxygen in alkaline medium in Ni(II)–sulfur(IV)–O₂ system

Sharma

Mudgal

Bansal

et al. 2010

Int J of Chemical Kinetics

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In the Ni(II)-S(IV)-O 2 system in the region of pH > 8.4, both Ni(II) and S(IV) are simultaneously autoxidized, and when sulfur is consumed fully NiOOH precipitates. At pH > 8.4, ethanol has no effect on the rate, whereas ammonia strongly inhibits the reaction when pH > 7.0. The kinetics of the reaction, in both the presence and the absence of ethanol, is defined by the rate lawwhere k is the rate constant, K O is the equilibrium constant for the adsorption of O 2 on Ni(OH) 2 particle surface. In ammonia buffer, the factor F is defined by

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Section: Methodsmentioning

confidence: 99%

“…In a recent study 1, ammonia was found to inhibit strongly the oxidation of sulfur(IV) by O 2 , which is known to proceed via a radical mechanism involving oxysulfur radicals, viz., SO

_{3}^{−}

, SO

_{4}^{−}

, and SO

_{5}^{−}

2–6, in alkaline solutions. An ammonia concentration of 1 × 10 −2 mol L −1 completely seized the reaction.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of the simultaneous oxidation of nickel(II) and sulfur(IV) by oxygen in alkaline medium in Ni(II)–sulfur(IV)–O₂ system

Sharma

Mudgal

Bansal

et al. 2010

Int J of Chemical Kinetics

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“…Fe 3+ is one of the major metal impurities in the FGD slurry. Fe 3+ was reported as a catalyst for the oxidation of SO 2 [22,23]. The mechanism for the catalysis was shown in Eq.…”

Section: Influence Of Fe 3+ Concentrationmentioning

confidence: 99%

Optimizing the characteristics of calcium sulfate dihydrate in the flue gas desulfurization process: Investigation of the impurities in slurry-Cl-, Fe3+, Mn2+

Lv¹,

Yang²,

Shen³

et al. 2017

CI&CEQ

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The effects of limestone, Cl-, Fe 3+ and Mn 2+ in slurry on the characteristics of calcium sulfate dehydrate (DH) in flue gas desulfurization (FGD) process were investigated. The moisture content, particle size distribution, and crystal morphology were considered as end use characteristics of DH. As a result, the number of needle-like DH crystals was increased with increasing total contents of MgCO 3 , Al 2 O 3 and Fe 2 O 3 in limestone. Clions were reported to distort the crystal structure and change the crystals from orthorhombic to irregular. Mn 2+ can increase the desulfurization efficiency by catalyzing the oxidation of SO 2. Finally, Fe 3+ will inhibit crystal growth of all faces, except {011} and {1-11}.

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“…They attribute this result to the formation of hydroxyl radicals. Mudgal et al 14 attributed the inhibition of ammonia and ammonium ions to the S(IV) catalytic oxidation reaction, and this was determined by capturing sulfur radicals and the formation of a Co(II)ÀNH 3 compound. The above-mentioned studies further confirmed the radical mechanism of transition metal ions in the liquid-phase catalytic oxidation of S(IV).…”

Section: Introductionmentioning

confidence: 99%

Reaction Kinetics and Mechanism of Iron(II)-Induced Catalytic Oxidation of Sulfur(IV) during Wet Desulfurization

Zhang

Zhou

et al. 2012

Ind. Eng. Chem. Res.

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The reaction kinetics of the Fe(II)-induced catalytic oxidation of S(IV) in a concentration range of 10 À6 M e [Fe(II)] e 1 M was studied. The S(IV) catalytic oxidation reaction order for O 2 and HSO 3 À was found to be 0 and 1 in this iron concentration range. The reaction order toward Fe(II) was 1 for 10 À6 M e [Fe(II)] e 10 À4 M, 0 for 10 À4 M < [Fe(II)] e 10 À2 M, and À0.2 for 10 À2 M e [Fe(II)] e 1 M. At 30À50°C the activation energy values were low but increased after an increase in the ionic strength. The ionic strength had a negative influence on the reaction rate constant in the iron concentration range. By analyzing the radical mechanisms and reaction kinetic results, a simplified model for the Fe(II)-induced catalytic oxidation of S(IV), which enables a better analysis and elucidation of the experimental results, is proposed.

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Kinetics of ammonia and ammonium ion inhibition of the atmospheric oxidation of aqueous sulfur dioxide by oxygen

Cited by 15 publications

References 72 publications

Kinetics of the simultaneous oxidation of nickel(II) and sulfur(IV) by oxygen in alkaline medium in Ni(II)–sulfur(IV)–O₂ system

Kinetics of the simultaneous oxidation of nickel(II) and sulfur(IV) by oxygen in alkaline medium in Ni(II)–sulfur(IV)–O₂ system

Optimizing the characteristics of calcium sulfate dihydrate in the flue gas desulfurization process: Investigation of the impurities in slurry-Cl-, Fe3+, Mn2+

Reaction Kinetics and Mechanism of Iron(II)-Induced Catalytic Oxidation of Sulfur(IV) during Wet Desulfurization

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Kinetics of ammonia and ammonium ion inhibition of the atmospheric oxidation of aqueous sulfur dioxide by oxygen

Cited by 15 publications

References 72 publications

Kinetics of the simultaneous oxidation of nickel(II) and sulfur(IV) by oxygen in alkaline medium in Ni(II)–sulfur(IV)–O2 system

Kinetics of the simultaneous oxidation of nickel(II) and sulfur(IV) by oxygen in alkaline medium in Ni(II)–sulfur(IV)–O2 system

Optimizing the characteristics of calcium sulfate dihydrate in the flue gas desulfurization process: Investigation of the impurities in slurry-Cl-, Fe3+, Mn2+

Reaction Kinetics and Mechanism of Iron(II)-Induced Catalytic Oxidation of Sulfur(IV) during Wet Desulfurization

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Kinetics of the simultaneous oxidation of nickel(II) and sulfur(IV) by oxygen in alkaline medium in Ni(II)–sulfur(IV)–O₂ system

Kinetics of the simultaneous oxidation of nickel(II) and sulfur(IV) by oxygen in alkaline medium in Ni(II)–sulfur(IV)–O₂ system