The Experts below are selected from a list of 38367 Experts worldwide ranked by ideXlab platform
Yexiang Tong - One of the best experts on this subject based on the ideXlab platform.
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Electro-oxidation of methanol, 1-propanol and 2-propanol on Pt and Pd in Alkaline Medium
Journal of Power Sources, 2008Co-Authors: Jianping Liu, San Ping Jiang, Yexiang TongAbstract:Abstract Pd is investigated as electrocatalyst for 1-propanol and 2-propanol oxidation and compared with the conventional catalyst of Pt in Alkaline Medium. The results show that Pd is a good electrocatalyst for 1-propanol and 2-propanol oxidation. The oxidation reaction of 1-propanol and 2-propanol shows a very low activity on Pt electrode, however the oxidation reaction of 1-propanol and 2-propanol shows a high activity on Pd electrode in Alkaline Medium. The current densities of 1-propanol and 2-propanol oxidation on Pd electrode are much higher at corresponding potentials than that of methanol oxidation and the onset potentials of 1-propanol and 2-propanol oxidation on Pd electrode are more negative compared with that of methanol oxidation. The 1-propanol and 2-propanol oxidation on Pd electrode shows a stable performance. The results show that Pd can take the place of Pt for 1-propanol and 2-propanol oxidation in Alkaline Medium. The present study shows a promising choice of Pd as effective electrocatalyst for 1-propanol and 2-propanol electro-oxidation in Alkaline Medium.
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Electrooxidation of 2-propanol on Pt, Pd and Au in Alkaline Medium
Electrochemistry Communications, 2007Co-Authors: Jianping Liu, San Ping Jiang, Yexiang TongAbstract:Pd and Au are investigated as electrocatalysts for 2-propanol oxidation and compared with the conventional catalyst of Pt in Alkaline Medium. The current density for 2-propanol oxidation on Pd electrode is much higher than that on Pt electrode. The onset potential for 2-propanol oxidation on Pd electrode is more negative compared with that on Pt electrode. The results show that Pd is a good electrocatalyst for 2-propanol oxidation and the activity for the electrooxidation of 2-propanol is higher than Pt and Au in Alkaline Medium. Pd has higher electrocatalytic activity and better stability for the electrooxidation of 2-propanol. The present study shows a promising choice of Pd as effective electrocatalyst for 2-propanol electrooxidation in Alkaline Medium.
Sharanappa T Nandibewoor - One of the best experts on this subject based on the ideXlab platform.
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oxidation of acebutolol by copper iii periodate complex in aqueous Alkaline Medium a kinetic and mechanistic approach
Journal of Solution Chemistry, 2016Co-Authors: Atmanand M Bagoji, Prashant A Magdum, Sharanappa T NandibewoorAbstract:Illuminating the complex reactions of molecules in aqueous solution is one of the most important tasks of experimental studies of reaction dynamics. The oxidant diperiodatocuprate(III) (DPC) was used for the oxidation of acebutolol (ACBT) in aqueous Alkaline Medium, at an ionic strength of 0.30 mol·dm−3. The stoichiometry was found to be 1:2 ([ACBT]:[DPC]). The order of the reaction with respect to [DPC] was unity when [DPC] << [ACBT], while the orders with respect to [ACBT] and [OH−] were less than unity, whereas it was negative less than unity in [\( {\text{IO}}_{ 4}^{ - } \)] over the concentration range studied. The final products of oxidation were identified by GC–MS analysis. Based on the experimental observations, a plausible mechanism is proposed. The reaction constants involved in the different steps of the reaction mechanism were calculated. The activation parameters and the thermodynamic quantities were determined and discussed. Active species of diperiodatocuprate(III) was found to be monoperiodatocuprate(III), i.e. [Cu(H2IO6)(H2O)2]. An understanding of the mechanism allows the chemistry to be interpreted, understood and predicted.
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mechanistic investigation on the oxidation of kinetin by ag iii periodate complex in aqueous Alkaline media a kinetic approach
Journal of Chemical Sciences, 2010Co-Authors: S D Lamani, A M Tatagar, Sharanappa T NandibewoorAbstract:The oxidation of amino acid, kinetin (KNT) by diperiodatoargentate(III) (DPA) in Alkaline Medium at a constant ionic strength of 0.5 mol dm−3 was studied spectrophtometrically. The reaction between KNT and DPA in Alkaline Medium exhibits 1: 3 stoichiometry (KNT: DPA). Intervention of free radicals was observed in the reaction. Based on the observed orders and experimental evidences, a mechanism involving the monoperiodatoargentate(III) (MPA) as the reactive oxidant species has been proposed. The products, furon-2-methanol and para-nitro-purine were identified by spot test and characterized by spectral studies. The rate constants and associated activation parameters for the proposed mechanism as well as the thermodynamic quantities for different equilibrium steps are reported and discussed.
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oxidative degradation and deamination of atenolol by diperiodatocuprate iii in aqueous Alkaline Medium a mechanistic study
Polyhedron, 2009Co-Authors: Rajesh N Hegde, Nagaraj P Shetti, Sharanappa T NandibewoorAbstract:Abstract The kinetics of oxidation of atenolol (ATN) by diperiodatocuprate(III) (DPC) in aqueous Alkaline Medium at a constant ionic strength of 0.10 mol dm −3 was studied spectrophotometrically. The reaction between DPC and ATN in Alkaline Medium exhibits 1:2 stoichiometry (ATN:DPC). The reaction is of first order in [DPC] and has less than unit order in both [ATN] and [alkali]. However, the order in [ATN] and [alkali] changes from first order to zero order as their concentration increase. Intervention of free radicals was observed in the reaction. Increase in periodate concentration decreases the rate. The oxidation reaction in Alkaline Medium has been shown to proceed via a monoperiodatocuprate(III)–ATN complex, which decomposes slowly in a rate-determining step followed by other fast steps to give the products. The main oxidative products were identified by spot test, IR, NMR and LC–ESI-MS studies. The reaction constants involved in the different steps of the mechanism are calculated. The activation parameters with respect to slow step of the mechanism are computed and discussed, and thermodynamic quantities are also determined.
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oxidation of nicotinate ion by heptavalent manganese a kinetic and mechanistic approach
Zeitschrift für Physikalische Chemie, 2003Co-Authors: Dinesh C Bilehal, Raviraj M Kulkarni, Sharanappa T NandibewoorAbstract:The kinetics of oxidation of nicotinate ion by permanganate in Alkaline Medium at a constant ionic strength has been studied spectrophotometrically. The reaction between permanganate and nicotinate ion in Alkaline Medium exhibits 2 : 1 stoichiometry (KMnO 4 : Nicotinate ion). The reaction shows first order dependence of rate on permanganate concentration and less than unit order dependence each in nicotinate ion and alkali concentrations. Reaction rate increases with increase in ionic strength and decrease in solvent polarity of the Medium. Initial addition of reaction products did not affect the rate significantly. A mechanism involving the formation of an intermediate complex between oxidant and substrate has been proposed. The rate and the activation parameters for the slow step have been evaluated.
Jianping Liu - One of the best experts on this subject based on the ideXlab platform.
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Electro-oxidation of methanol, 1-propanol and 2-propanol on Pt and Pd in Alkaline Medium
Journal of Power Sources, 2008Co-Authors: Jianping Liu, San Ping Jiang, Yexiang TongAbstract:Abstract Pd is investigated as electrocatalyst for 1-propanol and 2-propanol oxidation and compared with the conventional catalyst of Pt in Alkaline Medium. The results show that Pd is a good electrocatalyst for 1-propanol and 2-propanol oxidation. The oxidation reaction of 1-propanol and 2-propanol shows a very low activity on Pt electrode, however the oxidation reaction of 1-propanol and 2-propanol shows a high activity on Pd electrode in Alkaline Medium. The current densities of 1-propanol and 2-propanol oxidation on Pd electrode are much higher at corresponding potentials than that of methanol oxidation and the onset potentials of 1-propanol and 2-propanol oxidation on Pd electrode are more negative compared with that of methanol oxidation. The 1-propanol and 2-propanol oxidation on Pd electrode shows a stable performance. The results show that Pd can take the place of Pt for 1-propanol and 2-propanol oxidation in Alkaline Medium. The present study shows a promising choice of Pd as effective electrocatalyst for 1-propanol and 2-propanol electro-oxidation in Alkaline Medium.
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Electrooxidation of 2-propanol on Pt, Pd and Au in Alkaline Medium
Electrochemistry Communications, 2007Co-Authors: Jianping Liu, San Ping Jiang, Yexiang TongAbstract:Pd and Au are investigated as electrocatalysts for 2-propanol oxidation and compared with the conventional catalyst of Pt in Alkaline Medium. The current density for 2-propanol oxidation on Pd electrode is much higher than that on Pt electrode. The onset potential for 2-propanol oxidation on Pd electrode is more negative compared with that on Pt electrode. The results show that Pd is a good electrocatalyst for 2-propanol oxidation and the activity for the electrooxidation of 2-propanol is higher than Pt and Au in Alkaline Medium. Pd has higher electrocatalytic activity and better stability for the electrooxidation of 2-propanol. The present study shows a promising choice of Pd as effective electrocatalyst for 2-propanol electrooxidation in Alkaline Medium.
Ashok Kumar Singh - One of the best experts on this subject based on the ideXlab platform.
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first and novel oxidation of d fructose by potassium iodate using ircl3 h2o 2oh complex as a homogeneous catalyst in Alkaline Medium
Journal of Molecular Catalysis A-chemical, 2008Co-Authors: Surya Prakash Singh, Ashok Kumar Singh, Ajaya Kumar SinghAbstract:Abstract The kinetics of Ir(III)-catalyzed oxidation of d -fructose by potassium iodate was studied in an aqueous Alkaline Medium at 40 °C. The experimental result shows a first order dependence on iodate and [OH−] at their low concentrations, but tending towards zeroth order at their higher concentrations. Zero order kinetics with respect to [ d -fructose] was observed throughout its variation. The linear dependence of the reaction rate at lower [Ir(III)] chloride tends towards zero order at its higher concentrations. Variation in [Cl−] and ionic strength of the Medium did not bring about any significant change on the rate of reaction. The decrease in the rate of reaction with increase in the dielectric constant of the Medium was observed in the oxidation of d -fructose. Kinetic and equivalence studies together with product analysis, observed effect of dielectric constant of the Medium on the rate of reaction, activation parameters and multiple regression analysis furnished a basis for the formation of a common reaction mechanism for the iridium(III)-catalyzed oxidation of d -fructose by iodate in the Alkaline Medium.
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kinetics and mechanism of the ir iii catalyzed oxidation of xylose and maltose by potassium iodate in aqueous Alkaline Medium
Carbohydrate Research, 2007Co-Authors: Ashok Kumar Singh, Jaya Srivastava, Shalini Srivastava, Reena SinghAbstract:For the first time, the Ir(III) catalysis of the iodate oxidation of xylose and maltose in aqueous Alkaline Medium has been investigated. The reactions exhibit first-order kinetics with respect to lower [IO(3)(-)] and [OH(-)] and show zero-order kinetics at their higher concentrations. Unity order at low concentrations of maltose becomes zero order at its higher concentrations, whereas zero-order kinetics with respect to [xylose] was observed throughout its variation. The reaction rate is found to be directly proportional to [Ir(III)] in the oxidation of both reducing sugars. Negligible effect of [Cl(-)] and nil effect of ionic strength (mu) on the rate of oxidation have also been noted. The species, [IrCl(3)(H(2)O)(2)OH](-) was ascertained as the reactive species of Ir(III) chloride for both the redox systems. Various activation parameters have been calculated. Formic acid and arabinonic acid for maltose and formic acid and threonic acid for xylose were identified as the main oxidation products of the reactions. Mechanisms consistent with the observed kinetic data and spectral evidence have been proposed for the oxidation of xylose and maltose.
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mechanism of ruthenium iii catalysis of periodate oxidation of aldoses in aqueous Alkaline Medium
Catalysis Letters, 2004Co-Authors: Ashok Kumar Singh, N Chaurasia, Shahla Rahmani, Jaya Srivastava, Bharat SinghAbstract:A general mechanism for Ru(III) catalysed oxidation of L(+) arabinose (Ara) and D(+) galactose (Gal) in aqueous Alkaline Medium is proposed. The most reactive species of the catalyst was found to be [RuCl3(OH)2H2O]2−. The reactions exhibit pseudo-first order kinetics with respect to Ru(III) and are first order with respect to lower [IO4 −] and OH−, but tend towards zeroth order to both higher [IO4 −] and [OH−]. The reactions are zero order with respect to each aldoses. Positive effect of Cl− on the rate of reaction is also evident in the oxidation of both reducing sugars. A mechanism, involving the interaction of the reactive species of Ru(III) and [IO4 −] leading to the formation of a complex, which in the rate determining step decomposes into another complex with the release of Cl− ion, is proposed and the rate law is derived.
San Ping Jiang - One of the best experts on this subject based on the ideXlab platform.
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Electro-oxidation of methanol, 1-propanol and 2-propanol on Pt and Pd in Alkaline Medium
Journal of Power Sources, 2008Co-Authors: Jianping Liu, San Ping Jiang, Yexiang TongAbstract:Abstract Pd is investigated as electrocatalyst for 1-propanol and 2-propanol oxidation and compared with the conventional catalyst of Pt in Alkaline Medium. The results show that Pd is a good electrocatalyst for 1-propanol and 2-propanol oxidation. The oxidation reaction of 1-propanol and 2-propanol shows a very low activity on Pt electrode, however the oxidation reaction of 1-propanol and 2-propanol shows a high activity on Pd electrode in Alkaline Medium. The current densities of 1-propanol and 2-propanol oxidation on Pd electrode are much higher at corresponding potentials than that of methanol oxidation and the onset potentials of 1-propanol and 2-propanol oxidation on Pd electrode are more negative compared with that of methanol oxidation. The 1-propanol and 2-propanol oxidation on Pd electrode shows a stable performance. The results show that Pd can take the place of Pt for 1-propanol and 2-propanol oxidation in Alkaline Medium. The present study shows a promising choice of Pd as effective electrocatalyst for 1-propanol and 2-propanol electro-oxidation in Alkaline Medium.
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Electrooxidation of 2-propanol on Pt, Pd and Au in Alkaline Medium
Electrochemistry Communications, 2007Co-Authors: Jianping Liu, San Ping Jiang, Yexiang TongAbstract:Pd and Au are investigated as electrocatalysts for 2-propanol oxidation and compared with the conventional catalyst of Pt in Alkaline Medium. The current density for 2-propanol oxidation on Pd electrode is much higher than that on Pt electrode. The onset potential for 2-propanol oxidation on Pd electrode is more negative compared with that on Pt electrode. The results show that Pd is a good electrocatalyst for 2-propanol oxidation and the activity for the electrooxidation of 2-propanol is higher than Pt and Au in Alkaline Medium. Pd has higher electrocatalytic activity and better stability for the electrooxidation of 2-propanol. The present study shows a promising choice of Pd as effective electrocatalyst for 2-propanol electrooxidation in Alkaline Medium.