Kinetics of the solid-state carbothermic reduction of wessel manganese ores

1995 ◽  
Vol 26 (1) ◽  
pp. 13-24 ◽  
Author(s):  
Guven Akdogan ◽  
R. Hurman Eric
Keyword(s):  
Solid State ◽  
Carbothermic Reduction ◽  
Manganese Ores ◽  
Kinetics Of

scholarly journals Solid-State Redox Kinetics of CeO2 in Two-Step Solar CH4 Partial Oxidation and Thermochemical CO2 Conversion

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 723
Author(s):  
Mahesh Muraleedharan Nair ◽  
Stéphane Abanades
Keyword(s):  
Solid State ◽  
Solar Energy ◽  
Kinetic Models ◽  
Oxygen Carrier ◽  
Co2 Conversion ◽  
Oxidation Reactions ◽  
Redox Kinetics ◽  
Concentrated Solar Energy ◽  
Ceria Reduction ◽  
Kinetics Of

The CeO2/CeO2−δ redox system occupies a unique position as an oxygen carrier in chemical looping processes for producing solar fuels, using concentrated solar energy. The two-step thermochemical ceria-based cycle for the production of synthesis gas from methane and solar energy, followed by CO2 splitting, was considered in this work. This topic concerns one of the emerging and most promising processes for the recycling and valorization of anthropogenic greenhouse gas emissions. The development of redox-active catalysts with enhanced efficiency for solar thermochemical fuel production and CO2 conversion is a highly demanding and challenging topic. The determination of redox reaction kinetics is crucial for process design and optimization. In this study, the solid-state redox kinetics of CeO2 in the two-step process with CH4 as the reducing agent and CO2 as the oxidizing agent was investigated in an original prototype solar thermogravimetric reactor equipped with a parabolic dish solar concentrator. In particular, the ceria reduction and re-oxidation reactions were carried out under isothermal conditions. Several solid-state kinetic models based on reaction order, nucleation, shrinking core, and diffusion were utilized for deducing the reaction mechanisms. It was observed that both ceria reduction with CH4 and re-oxidation with CO2 were best represented by a 2D nucleation and nuclei growth model under the applied conditions. The kinetic models exhibiting the best agreement with the experimental reaction data were used to estimate the kinetic parameters. The values of apparent activation energies (~80 kJ·mol−1 for reduction and ~10 kJ·mol−1 for re-oxidation) and pre-exponential factors (~2–9 s−1 for reduction and ~123–253 s−1 for re-oxidation) were obtained from the Arrhenius plots.

Effect of praseodymium on the solid-state oxidation kinetics of an AMg2 alloy

2015 ◽  
Vol 2015 (7) ◽  
pp. 521-524 ◽  
Author(s):  
N. F. Ibrokhimov ◽  
I. N. Ganiev ◽  
A. E. Berdiev ◽  
N. I. Ganieva
Keyword(s):  
Solid State ◽  
Oxidation Kinetics ◽  
Kinetics Of

Carbothermic reduction kinetics of nanocrystallite Fe2O3/NiO composites for the production of Fe/Ni alloy

2008 ◽  
Vol 463 (1-2) ◽  
pp. 585-590 ◽  
Author(s):  
K.S. Abdel-Halim ◽  
M.H. Khedr ◽  
M.I. Nasr ◽  
M.Sh. Abdel-wahab
Keyword(s):  
Carbothermic Reduction ◽  
Reduction Kinetics ◽  
Ni Alloy ◽  
Kinetics Of

scholarly journals Models for Kinetics of Solid State Sintering

1979 ◽  
Vol 62 (3-4) ◽  
pp. 138-141 ◽  
Author(s):  
BOON WONG ◽  
JOSEPH A. PASK
Keyword(s):  
Solid State ◽  
Solid State Sintering ◽  
Kinetics Of

Kinetics of the Oxidation of Chromium-Doped Zn0.5Al Alloy in the Solid State

2021 ◽  
Vol 95 (1) ◽  
pp. 221-223
Author(s):  
Z. R. Obidov ◽  
P. R. Ibrokhimov ◽  
F. A. Rakhimov ◽  
I. N. Ganiev
Keyword(s):  
Solid State ◽  
Kinetics Of
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