Ru(EDTA) mediated partial reduction of O2 by H2S
IR@CMERI: CSIR- Central Mechanical Engineering Research Institute (CMERI), Durgapur
View Archive Info| Field | Value | |
| Title |
Ru(EDTA) mediated partial reduction of O2 by H2S
|
|
| Creator |
Chatterjee, Debabrata
Jaiswal, Namita Sarkar, Papiya |
|
| Subject |
Chemistry
|
|
| Description |
An effective procedure for selective reduction of O2 to H2O2 exploring the use of hydrogen sulfide, an obnoxious industrial pollutant as reductant is reported herein. The reduction of [RuIII(EDTA)pz]− (EDTA4− = ethylenediaminetetraacetate; pz = pyrazine) by hydrogen sulfide resulting in the formation of a red [RuII(EDTA)pz]2− complex (λmax = 462 nm) has been studied spectrophotometrically and kinetically using both rapid scan and stopped-flow techniques. The time course of the reaction was followed as a function of [HS−]i, pH (5.5–8.5), and temperature. Alkali metal ions were found to have a positive influence (K+ > Na+ > Li+) on the reaction rate. Kinetic data and activation parameters are interpreted in terms of a mechanism (admittedly speculative) involving outer-sphere electron transfer between the reaction partners. Reaction of the red [RuII(EDTA)pz]2− complex with molecular oxygen regenerates the [RuIII(EDTA)pz]− species in the reacting system along with the formation of H2O2, a partially reduced product of dioxygen (O2) reduction. A detailed reaction mechanism in agreement with the spectral and kinetic data is presented.
|
|
| Publisher |
Royal Society of Chemistry
|
|
| Date |
2015
|
|
| Type |
Article
PeerReviewed |
|
| Identifier |
Chatterjee, Debabrata and Jaiswal, Namita and Sarkar, Papiya (2015) Ru(EDTA) mediated partial reduction of O2 by H2S. Dalton Transactions, 44. pp. 7613-7617.
|
|
| Relation |
http://cmeri.csircentral.net/270/
|
|