THE KINETICS AND MECHANISM OF THE Cu++-CATALYZED REDUCTION OF CrVI BY HYDROGEN IN AQUEOUS SOLUTIONS

1961 ◽  
Vol 39 (1) ◽  
pp. 162-170 ◽  
Author(s):  
E. A. Hahn ◽  
E. Peters
Keyword(s):  
Aqueous Solutions ◽  
Kinetic Study ◽  
Kinetics And Mechanism ◽  
Rate Law ◽  
Kinetics Of

The kinetics of the Cu++-catalyzed reduction of CrVI by H2 in aqueous perchlorate solutions have been investigated between 160° and 200 °C. The mechanism proposed to account for the kinetics gives rise to a rate law of the form[Formula: see text]where[Formula: see text]As a consequence of these studies an important anomaly between the previously published rate law for dichromate reduction and a more recent kinetic study of the cupric-perchlorate-catalyzed hydrogen–oxygen recombination has been resolved.

scholarly journals Polyethylene Glycol Mediated Kinetic Study of Nitro Decarboxylation ofα,β-Unsaturated Acids by Blau’s Fe(III) Phen Complex

2013 ◽  
Vol 2013 ◽  
pp. 1-10
Author(s):  
K. Ramesh ◽  
S. Shylaja ◽  
K. C. Rajanna ◽  
P. Giridhar Reddy ◽  
P. K. Saiprakash
Keyword(s):  
Polyethylene Glycol ◽  
Kinetic Study ◽  
Structural Variation ◽  
Negative Charge ◽  
Reaction Rates ◽  
Cationic Form ◽  
Rate Law ◽  
Structural Resemblance ◽  
Kinetics Of ◽  
Acetonitrile Medium

Polyethylene glycol (PEG) mediated kinetic study of nitro decarboxylation ofα,β-unsaturated acids (USA) has been taken up by Blau’s [Fe(III) nitrate-Phen] yellow complex in acetonitrile medium. Kinetics of the reactions indicated Michaelis-Menton type of mechanism and rate law. Reaction rates are significantly influenced by the structural variation and concentration of PEG. Catalysis of PEG was explained on the lines of nonionic micelles such as TX-100 because of their structural resemblance and also due to a slight negative charge developed on polyoxyethylene and cationic form(s) of Fe(III) chelates in the intermediate stages.

scholarly journals Kinetics and Mechanism of Slurry Phase Air Oxidation of Benzyl Alcohol over Zirconium Vanadate Catalyst

2020 ◽  
Vol 33 (1) ◽  
pp. 108-112
Author(s):  
Shweta Kanungo Joshi ◽  
Neena Sohani ◽  
Savita Khare ◽  
Rajendra Prasad
Keyword(s):  
Benzyl Alcohol ◽  
Kinetics And Mechanism ◽  
Air Oxidation ◽  
Redox Mechanism ◽  
Rate Law ◽  
Oxidation Of Benzyl Alcohol ◽  
Slurry Phase ◽  
Partial Pressures ◽  
Kinetics Of ◽  
Zirconium Vanadate

The kinetics of slurry phase air oxidation of benzyl alcohol to benzaldehyde over zirconium vanadate catalyst is reported in this study. Initial rates for the formation of product were determined by varying the partial pressures of the reactants. The data collected were found to satisfy a rate law: R = [(k1PBk2Po)/(k1PB + k2Po)]. The study suggests that reaction follows a Mars-Van Krevelen type of redox mechanism.

Kinetics and mechanism of the oxidation of proline by periodate

1989 ◽  
Vol 67 (4) ◽  
pp. 634-638 ◽  
Author(s):  
Rosa Pascual ◽  
Miguel A. Herraez ◽  
Emilio Calle.
Keyword(s):  
Amino Acid ◽  
Rate Constants ◽  
Reaction Rate ◽  
Ph Dependence ◽  
Kinetics And Mechanism ◽  
Appreciable Amount ◽  
Kinetics Of Oxidation ◽  
Rate Law ◽  
First Order ◽  
Kinetics Of

The kinetics of oxidation of proline by periodate has been studied at pH 1.40–8.83 and 30.0 °C. The reaction rate is first order in both periodate and amino acid, and the overall reaction follows second-order kinetics. There was no evidence for the formation of an appreciable amount of intermediate. The reaction rate is highest at pH 4–7 and the oxidation is catalysed by [Formula: see text] ions. The pH dependence of the reaction rate can be explained in terms of reaction of periodate monoanion and the protonated and dipolar forms of the amino acid. The mechanism proposed and the derived rate law are consistent with the observed kinetics. The rate constants obtained from the derived rate law are in agreement with the observed rate constants, thus justifying the rate law and the proposed mechanistic scheme. Keywords: oxidation of proline, oxidation by periodate.

scholarly journals Kinetics of Reactive Blue 21 Decolorization Using Peracetic Acid

2017 ◽  
Vol 33 (3) ◽  
Author(s):  
Vu Duy ◽  
Le Van Chieu ◽  
Cao The Ha
Keyword(s):  
Aqueous Solutions ◽  
Reaction Kinetics ◽  
Peracetic Acid ◽  
Light Absorption ◽  
Second Order ◽  
Catalytic Reactions ◽  
Rate Law ◽  
Order Rate ◽  
Decolorization Rate ◽  
Kinetics Of

Decolorization rate of Reactive Blue 21 by peracetic acid in aqueous solutions was measured at pH 6.0. Concentrations of peracetic acid were applied in the range of 1 - 3 mM. The reaction kinetics were monitored by recording the light absorption of the Reactive Blue 21 at 660 nm. The obtained results showed that the decolorization happened via non-catalytic and auto-catalytic reactions. Both the reactions were proposed to obey the second-order rate law.

Kinetics and mechanism of the bromination of 4-pyridone and related derivatives in aqueous solution

1983 ◽  
Vol 61 (11) ◽  
pp. 2556-2562 ◽  
Author(s):  
Oswald S. Tee ◽  
Martino Paventi
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Point Of View ◽  
Kinetics And Mechanism ◽  
Ph Range ◽  
Kinetics Of

The kinetics of bromination of 4-pyridone and selected derivatives have been measured in aqueous solutions in the pH range 0–9, at 25 °C. The tautomeric system 4-pyridone [Formula: see text] 4-hydroxypyridine [Formula: see text] reaets with bromine via the predominant (pyridone) tautomer at pH < 6 and via the conjugate anion at pH > 6. 3-Bromo-4-pyridone behaves similarly. The kinetics also reveal that the facile dibromination of 4-pyridone occurs because at most pH's the monobromo derivative is actually more reactive towards bromine by virtue of its lower pKa values. From the point of view of reactivity the 4-pyridones and their anions behave as substituted phenoxide ions. 4-Methoxypyridine does not undergo bromination under comparable conditions, but rather forms a complex with bromine.

scholarly journals Kinetics of MgWO4 Formation in the Solid State Reaction between MgO and WO3

1976 ◽  
Vol 31 (6) ◽  
pp. 619-621 ◽  
Author(s):  
Giorgio Flor ◽  
Riccardo Riccardi
Keyword(s):  
Solid State ◽  
Kinetic Study ◽  
Single Crystals ◽  
Solid State Reaction ◽  
Argon Atmosphere ◽  
Conductivity Measurements ◽  
Linear Rate ◽  
Rate Law ◽  
Temperature Range ◽  
Kinetics Of

The solid state reaction of MgWO4 formation from MgO (single crystals) and WO3 was investigated in the temperature range 800 - 985 °C under both air and argon atmosphere.The techniques employed for the kinetic study (contact and thermogravimetric methods) allowed to point out that the process follows the linear rate law in the early stages and the parabolic one in the subsequent stages.From inert marker experiments, kinetic determinations under the two different atmospheres and conductivity measurements, it was possible to state that the reaction is governed by a cation counterdiffusion mechanism

Effects of salts on the kinetics of oxidation of alkenes by thallic salts in aqueous solutions

1981 ◽  
Vol 46 (3) ◽  
pp. 693-700 ◽  
Author(s):  
Milan Strašák ◽  
Jaroslav Majer
Keyword(s):  
Aqueous Solutions ◽  
Phase Transfer ◽  
Heterogeneous Reaction ◽  
Qualitative Model ◽  
Kinetic Effect ◽  
Tetraalkylammonium Salts ◽  
Reaction Conditions ◽  
Kinetics Of Oxidation ◽  
Kinetics Of ◽  
Heterogeneous Reaction Conditions

The kinetics of oxidation of alkenes by thallic sulphate in aqueous solutions, involving the two reaction steps-the hydroxythallation and the dethallation - was studied, and the effect of salts on the kinetics was examined; this made it possible to specify more precisely the reaction mechanism and to suggest a qualitative model of the reaction coordinate. It was found that in homogeneous as well as in heterogeneous reaction conditions, the reaction can be accelerated appreciably by adding tetraalkylammonium salts. These salts not only operate as catalysts of the phase transfer, but also exert a significant kinetic effect, which can be explained with a simplification in terms of a stabilization of the transition state of the reaction.

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