Study on the Oxidation Mechanism of Mixed Thiols in Light Oil Sweetening. 3. Apparent Kinetics of the Catalytic Cooxidation of Mixed Thiols in Gas−Liquid−Solid Systems

1999 ◽  
Vol 38 (4) ◽  
pp. 1291-1294 ◽  
Author(s):  
Daohong Xia ◽  
Yixun Su ◽  
Jialin Qian
Keyword(s):  
Oxidation Mechanism ◽  
Light Oil ◽  
Kinetics Of

Mechanistic kinetics of catalytic oxidation of 1-butanethiol in light oil sweetening

2012 ◽  
Vol 198 (1) ◽  
pp. 246-251 ◽  
Author(s):  
Sudip K. Ganguly ◽  
Gautam Das ◽  
Sunil Kumar ◽  
Bir Sain ◽  
Madhukar O. Garg
Keyword(s):  
Catalytic Oxidation ◽  
Light Oil ◽  
Kinetics Of

Le comportement électrochimique du magnésium en milieux légèrement alcalins

1980 ◽  
Vol 58 (1) ◽  
pp. 30-38 ◽  
Author(s):  
Robert-Louis Brossard ◽  
Dominique-Louis Piron
Keyword(s):  
Corrosion Product ◽  
Hydrogen Evolution Reaction ◽  
Electrode Potential ◽  
Oxidation Mechanism ◽  
Chloride Ions ◽  
Anodic Behavior ◽  
High Concentration ◽  
Oxidation Layer ◽  
Kinetics Of ◽  
Simulated Seawater

This study of the anodic behavior of magnesium in simulated seawater has shown that the corrosion product formed at the surface of the electrode depends mainly on the nature of ions dissolved in the electrolyte. Analyses of the corrosion product, formed in the presence of a high concentration of chloride ions, are compatible with the formation of a compound having approximately the formula 5Mg(OH)2•MgCl2. However, this complex is gradually transformed over a period of several hours into Mg(OH)2.A model of the oxidation mechanism is presented in which the characteristics of the anodic behavior of magnesium are related to the structure of the oxidation layer. For example, the activation of the surface of the anode, the kinetics of the hydrogen evolution reaction, and the large difference between values of corrected and uncorrected electrode potential can all be explained by this model. It is the resistance of the film to the flow of current which controls the kinetics of anodic dissolution of magnesium.

scholarly journals Model Discrimination for Hydrogen Peroxide Consumption towards γ-Alumina in Homogeneous Liquid and Heterogeneous Liquid-Liquid Systems

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1476
Author(s):  
Daniele Di Menno Di Bucchianico ◽  
Wander Y. Perez-Sena ◽  
Valeria Casson Moreno ◽  
Tapio Salmi ◽  
Sébastien Leveneur
Keyword(s):  
Hydrogen Peroxide ◽  
Ring Opening ◽  
Oxidation Mechanism ◽  
Liquid System ◽  
Side Reactions ◽  
Hydroxyl Groups ◽  
Homogeneous Liquid ◽  
Liquid Systems ◽  
Kinetics Of

The use of hydrogen peroxide as an oxidizing agent becomes increasingly important in chemistry. The example of vegetable oil epoxidation is an excellent illustration of the potential of such an agent. This reaction is traditionally performed by Prileschajew oxidation, i.e., by the in situ production of percarboxylic acids. Drawbacks of this approach are side reactions of ring-opening and thermal runaway reactions due to percarboxylic acid instability. One way to overcome this issue is the direct epoxidation by hydrogen peroxide by using γ-alumina. However, the reaction mechanism is not elucidated: does hydrogen peroxide decompose with alumina or oxidize the hydroxyl groups at the surface? The kinetics of hydrogen peroxide consumption with alumina in homogeneous liquid and heterogeneous liquid-liquid systems was investigated to reply to this question. Bayesian inference was used to determine the most probable models. The results obtained led us to conclude that the oxidation mechanism is the most credible for the heterogeneous liquid-liquid system.

scholarly journals Analysis of methods for increasing the oxidation resistance of carbon-graphite products used in metallurgical and chemical units

2021 ◽  
Vol 25 (3) ◽  
pp. 380-390
Author(s):  
R. Yu. Feshchenko ◽  
O. O. Erokhina ◽  
R. N. Eremin ◽  
B. E. Matylskiy
Keyword(s):  
Oxidation Resistance ◽  
Oxidation Mechanism ◽  
Phosphate Glasses ◽  
Operating Conditions ◽  
Protective Properties ◽  
Temperature Conditions ◽  
Graphite Oxidation ◽  
Technical Solutions ◽  
Kinetics Of ◽  
Glassy Coating

This review study analyses the existing methods for increasing the oxidation resistance of carbon-graphite products, as well as assesses their applicability in metallurgical and chemical units. The reseach basis was the data published on the oxidation mechanism of carbon-graphite materials, conditions for their use in metallurgical and chemical processes, as well as existing technologies aimed at improving the oxidation resistance of artificial graphites. The existing ideas about the kinetics of carbon graphite oxidation are described depending on temperature conditions. A review of existing technologies for increasing the oxidation resistance of materials and their economic efficiency, taking into account the conditions of their operation, was carried out. Prospects of the presented solutions for the units of metallurgical and chemical industries were analysed. Three modes of oxidation of graphitised materials were distinguished on the basis of operating conditions, chemical and physical properties. According to this classification, the most rational method for increasing oxidation resistance consists in the impregnation of carbon-graphite materials with the formation of a protective glassy coating in the volume of through pores or with the formation of a coating (a continuous layer on the surface of the product) due to the occurrence of a chemical reaction with the reagents used. For most metallurgical and chemical units, the impregnation of carbon-graphite materials with the formation of borate and phosphate glasses is preferable, primarily due to lower economic costs. The applicability of this method is currently limited by temperature conditions, at which the protective properties and continuity of the formed glassy coatings are preserved. Therefore, additional research is required to adapt the conventional technological and technical solutions to the high-temperature conditions of metallurgical units (over 800°C).

scholarly journals Oxidation mechanism and kinetics of SiBCN/HfC ceramic composites at high temperatures

2020 ◽  
Vol 9 (2) ◽  
pp. 2289-2298 ◽  
Author(s):  
Yuquan Wei ◽  
Yong Yang ◽  
Meng Liu ◽  
Qile Li ◽  
Zhengren Huang
Keyword(s):  
High Temperatures ◽  
Oxidation Mechanism ◽  
Ceramic Composites ◽  
Mechanism And Kinetics ◽  
Kinetics Of

THE SILVER CATALYZED OXIDATION OF ETHYLENE: III. KINETICS OF ETHYLENE OXIDE OXIDATION

1954 ◽  
Vol 32 (4) ◽  
pp. 432-442 ◽  
Author(s):  
A. Orzechowski ◽  
K. E. MacCormack
Keyword(s):  
Ethylene Oxide ◽  
Initial Rate ◽  
Oxidation Mechanism ◽  
Kinetic Studies ◽  
Main Step ◽  
Direct Oxidation ◽  
Flow Rates ◽  
Rate Determining Step ◽  
Kinetics Of ◽  
Catalyzed Oxidation

A flow type apparatus was used for kinetic studies of the silver catalyzed oxidation of ethylene oxide (EtO) by oxygen at 274 °C. Using N2 as diluent the concentrations of O2 and ethylene oxide were varied independently from 9.9 to 79% and 2.35 to 9.4% respectively while a total pressure of 1 atmosphere was maintained. Flow rates were varied to give a range of contact times varying from 0.06 to 0.25 sec. It was shown that EtO is oxidized without previous dissociation into C2H4 and O2. The dependence of the initial rate of oxidation of EtO on reactant concentrations excludes isomerization of EtO (to acetalde hyde) as a main step in its oxidation, and a direct oxidation mechanism is suggested. The results of a few experiments to determine the extent of isomerization of EtO to acetaldehyde in the absence of oxygen are presented. No steady state could be achieved but the results may be used semiquantitatively to support the belief that isomerization is not the rate determining step in the oxidation of ethylene oxide.

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