scholarly journals Kinetic Analysis of the Anodic Carbon Oxidation Mechanism in a Molten Carbonate Medium

2014 ◽  
Vol 129 ◽  
pp. 389-395 ◽  
Author(s):  
Jessica A. Allen ◽  
John Tulloch ◽  
Louis Wibberley ◽  
Scott W. Donne
Keyword(s):  
Kinetic Analysis ◽  
Oxidation Mechanism ◽  
Carbon Oxidation ◽  
Molten Carbonate ◽  
Carbonate Medium

Synthesis of YFeO3-δ and LaFeO3-δ Perovskites with High Catalytic Activity in Carbon Oxidation Reactions

2021 ◽  
Vol 316 ◽  
pp. 105-109
Author(s):  
Evgeny A. Kirichenko ◽  
Pavel G. Chigrin ◽  
Anton A. Gnidenko
Keyword(s):  
Oxidation Mechanism ◽  
Soot Oxidation ◽  
Complex Oxide ◽  
Maximum Temperature ◽  
High Catalytic Activity ◽  
Carbon Oxidation ◽  
Oxidation Reactions ◽  
Oxide Systems ◽  
Reduction Of Metal Oxides ◽  
Catalytic Reaction Mechanism

YFeO3-δ (δ = 0.26) and LaFeO3-δ (δ = 0.5) perovskites with a high specific surface and oxygen non-stoichiometry was firstly synthesized by pyrolysis of polymer-salt compositions. It was shown that the catalytic oxidation of carbon in the presence of these complex oxide systems proceeds in the range of 400 - 700 °С, with a maximum temperature at 556 °С for YFeO3-δ; and 380 - 620 °С ,with a maximum temperature at 501 °С for LaFeO3-δ, in one-stage mode for both. By means of thermal analysis and diffractometry, it was shown that there is no contribution to the soot oxidation mechanism by cyclic perovskite surface transformations, due to the reduction of metal oxides by the soot and their subsequent reoxidation. It has been established that the basis of the catalytic reaction mechanism for both perovskites is the presence of oxygen vacancies on the surface of complex oxides.

scholarly journals Carbon Species Solvated in Molten Carbonate Electrolyser Cell from First-Principles Simulations

2020 ◽  
Author(s):  
Antoine Carof ◽  
François-Xavier Coudert ◽  
Dario Corradini ◽  
Dominika Lesnicki ◽  
elsa desamele ◽  
...  
Keyword(s):  
First Principles ◽  
Diffusion Coefficients ◽  
Similar Reaction ◽  
Molten Carbonate ◽  
Preferential Formation ◽  
Carbonate Ions ◽  
Carbon Species ◽  
Carbonate Medium

We study the solvation of molecules and ions that are key in the context of Molten Carbonate Electrolyser Cells using first-principles simulations. Focusing on the electroreduction of CO<sub>2</sub> to CO in a molten carbonate medium, we investigate the solvation of both the reactant CO<sub>2</sub> and the product CO in the eutectic LiKCO<sub>3</sub>, (containing 62 % Li<sub>2</sub>CO<sub>3</sub>, 38 % K<sub>2</sub>CO<sub>3</sub>,). CO<sub>2</sub> is found to spontaneously react with the carbonate ions to form the transient pyrocarbonate species, C<sub>2</sub>O<sub>5</sub><sup>2-</sup>. To investigate the similar reaction that could occur with CO and CO<sub>3</sub><sup>2-</sup> to form an oxalate, we simulated that species and found it to be stable in the melt, supporting this hypothesis. We further present the solvation of O<sup>2-</sup>, finding that it shows preferential formation of a complex with four lithium cations in a tetrahedral arrangement. Estimates of the diffusion coefficients of these species are then reported, showing that CO has the faster diffusion of all the molecules and ions studied.<br>

Effect of feed gas composition on the rate of carbon oxidation with Pt/SiO2 and the oxidation mechanism

1999 ◽  
Vol 21 (1) ◽  
pp. 9-17 ◽  
Author(s):  
Junko Oi-Uchisawa ◽  
Akira Obuchi ◽  
Atsushi Ogata ◽  
Ryuji Enomoto ◽  
Satoshi Kushiyama
Keyword(s):  
Oxidation Mechanism ◽  
Carbon Oxidation ◽  
Gas Composition

scholarly journals Carbon Species Solvated in Molten Carbonate Electrolyser Cell from First-Principles Simulations

2020 ◽  
Author(s):  
Antoine Carof ◽  
François-Xavier Coudert ◽  
Dario Corradini ◽  
Dominika Lesnicki ◽  
elsa desamele ◽  
...  
Keyword(s):  
First Principles ◽  
Diffusion Coefficients ◽  
Similar Reaction ◽  
Molten Carbonate ◽  
Preferential Formation ◽  
Carbonate Ions ◽  
Carbon Species ◽  
Carbonate Medium

We study the solvation of molecules and ions that are key in the context of Molten Carbonate Electrolyser Cells using first-principles simulations. Focusing on the electroreduction of CO<sub>2</sub> to CO in a molten carbonate medium, we investigate the solvation of both the reactant CO<sub>2</sub> and the product CO in the eutectic LiKCO<sub>3</sub>, (containing 62 % Li<sub>2</sub>CO<sub>3</sub>, 38 % K<sub>2</sub>CO<sub>3</sub>,). CO<sub>2</sub> is found to spontaneously react with the carbonate ions to form the transient pyrocarbonate species, C<sub>2</sub>O<sub>5</sub><sup>2-</sup>. To investigate the similar reaction that could occur with CO and CO<sub>3</sub><sup>2-</sup> to form an oxalate, we simulated that species and found it to be stable in the melt, supporting this hypothesis. We further present the solvation of O<sup>2-</sup>, finding that it shows preferential formation of a complex with four lithium cations in a tetrahedral arrangement. Estimates of the diffusion coefficients of these species are then reported, showing that CO has the faster diffusion of all the molecules and ions studied.<br>

scholarly journals Carbon Species Solvated in Molten Carbonate Electrolyser Cell from First-Principles Simulations

2020 ◽  
Author(s):  
Antoine Carof ◽  
François-Xavier Coudert ◽  
Dario Corradini ◽  
Dominika Lesnicki ◽  
elsa desamele ◽  
...  
Keyword(s):  
First Principles ◽  
Diffusion Coefficients ◽  
Similar Reaction ◽  
Molten Carbonate ◽  
Preferential Formation ◽  
Carbonate Ions ◽  
Carbon Species ◽  
Carbonate Medium

We study the solvation of molecules and ions that are key in the context of Molten Carbonate Electrolyser Cells using first-principles simulations. Focusing on the electroreduction of CO<sub>2</sub> to CO in a molten carbonate medium, we investigate the solvation of both the reactant CO<sub>2</sub> and the product CO in the eutectic LiKCO<sub>3</sub>, (containing 62 % Li<sub>2</sub>CO<sub>3</sub>, 38 % K<sub>2</sub>CO<sub>3</sub>,). CO<sub>2</sub> is found to spontaneously react with the carbonate ions to form the transient pyrocarbonate species, C<sub>2</sub>O<sub>5</sub><sup>2-</sup>. To investigate the similar reaction that could occur with CO and CO<sub>3</sub><sup>2-</sup> to form an oxalate, we simulated that species and found it to be stable in the melt, supporting this hypothesis. We further present the solvation of O<sup>2-</sup>, finding that it shows preferential formation of a complex with four lithium cations in a tetrahedral arrangement. Estimates of the diffusion coefficients of these species are then reported, showing that CO has the faster diffusion of all the molecules and ions studied.<br>

Evaluation of Oxidation Behavior of the C-B4C-SiC Composite through Continuous Measurement of Mass Change and Gas Concentration

2006 ◽  
Vol 510-511 ◽  
pp. 402-405
Author(s):  
Yasuo Uchiyama ◽  
Yusuke Abe ◽  
Guo Bin Zheng ◽  
Hideaki Sano
Keyword(s):  
Oxygen Consumption ◽  
Oxidation Behavior ◽  
Oxidation Mechanism ◽  
Carbon Matrix ◽  
Carbon Oxidation ◽  
Total Oxygen ◽  
Co2 Gas ◽  
Gas Concentration ◽  
Thermogravimetric Analyzer ◽  
Sic Composites

Change in mass and gas concentration during oxidation of carbon matrix composite added with B4C and SiC particles as an inhibiter for oxidation were measured continuously and accurately using a thermogravimetric analyzer, a couple of zirconia type oxygen sensors and infrared CO-CO2 gas analyzer. Total amount of oxygen consumed, the amount of oxygen consumed for matrix carbon oxidation, the amount of oxygen incorporated in CO and CO2 gases, total oxygen consumption rate during oxidation of the composite were obtained. The amount of glass phase formed from the inhibiter and the amount of matrix carbon oxidized could be estimated from calculation of a mole balance between the total oxygen consumption and the amount of oxygen incorporated in CO and CO2 gases. Oxidation behavior and oxidation mechanism of the C-B4C-SiC composites were clarified.

Kinetic Aspects of the Interaction of Blood Clotting Enzymes

1965 ◽  
Vol 13 (01) ◽  
pp. 155-175 ◽  
Author(s):  
H. C Hemker ◽  
P.W Hemker ◽  
E. A Loeliger
Keyword(s):  
Kinetic Analysis ◽  
Enzyme Kinetics ◽  
Blood Clotting ◽  
Enzyme System ◽  
Enzyme Kinetic ◽  
Clotting Time ◽  
Standard Methods

SummaryApplication of the methods of enzyme-kinetic analysis to the results of clotting tests is feasible and can yield useful results. However, the standard methods of enzyme kinetics are not applicable without modifications imposed by the peculiarities of the blood-clotting enzyme system. The influence of the following complicating circumstances is calculated :1. Substrate is not present in excess.2. Only relative measures exist for concentrations of substrate or enzymes.3. Enzymes and substrates are often added together.4. Reagents are not pure.5. Clotting-time is our only measure for clotting-velocity.Formulas are deduced, which makes it possible to recognize the effect of these complications.

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