Kinetics of FeIIIEDTA complex reduction with iron powder under aerobic conditions

The authors proposed and treated quantitatively a kinetic model for deposition of epitaxial GaAs layers prepared by reaction of trimethylgallium with arsine in hydrogen atmosphere. The transport of gallium to the surface of the substrate is considered as the controlling process. The influence of the rate of chemical reactions in the gas phase and on the substrate surface on the kinetics of the deposition process is neglected. The calculated dependence of the growth rate of the layers on the conditions of the deposition is in a good agreement with experimental data in the temperature range from 600 to 800°C.

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Torrefaction Thermogravimetric Analysis and Kinetics of Sorghum Distilled Residue for Sustainable Fuel Production

Sustainability ◽

10.3390/su13084246 ◽

2021 ◽

Vol 13 (8) ◽

pp. 4246

Author(s):

Shih-Wei Yen ◽

Wei-Hsin Chen ◽

Jo-Shu Chang ◽

Chun-Fong Eng ◽

Salman Raza Naqvi ◽

...

Keyword(s):

Kinetic Model ◽

Pso Algorithm ◽

Nitrogen Atmosphere ◽

Computational Method ◽

Weight Changes ◽

Design And Optimization ◽

Thermogravimetric Analyzer ◽

Model Free ◽

Different Temperatures ◽

Kinetics Of

This study investigated the kinetics of isothermal torrefaction of sorghum distilled residue (SDR), the main byproduct of the sorghum liquor-making process. The samples chosen were torrefied isothermally at five different temperatures under a nitrogen atmosphere in a thermogravimetric analyzer. Afterward, two different kinetic methods, the traditional model-free approach, and a two-step parallel reaction (TPR) kinetic model, were used to obtain the torrefaction kinetics of SDR. With the acquired 92–97% fit quality, which is the degree of similarity between calculated and real torrefaction curves, the traditional method approached using the Arrhenius equation showed a poor ability on kinetics prediction, whereas the TPR kinetic model optimized by the particle swarm optimization (PSO) algorithm showed that all the fit qualities are as high as 99%. The results suggest that PSO can simulate the actual torrefaction kinetics more accurately than the traditional kinetics approach. Moreover, the PSO method can be further employed for simulating the weight changes of reaction intermediates throughout the process. This computational method could be used as a powerful tool for industrial design and optimization in the biochar manufacturing process.

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A Logistic Approach for Kinetics of Isothermal Pyrolysis of Cellulose

Processes ◽

10.3390/pr9030551 ◽

2021 ◽

Vol 9 (3) ◽

pp. 551

Author(s):

Jorge López-Beceiro ◽

Ana María Díaz-Díaz ◽

Ana Álvarez-García ◽

Javier Tarrío-Saavedra ◽

Salvador Naya ◽

...

Keyword(s):

Kinetic Model ◽

Time Derivative ◽

Inert Atmosphere ◽

Second Step ◽

Rate Parameter ◽

Thermogravimetric Data ◽

Different Temperatures ◽

Parameter Values ◽

Kinetics Of ◽

Logistic Functions

A kinetic model is proposed to fit isothermal thermogravimetric data obtained from cellulose in an inert atmosphere at different temperatures. The method used here to evaluate the model involves two steps: (1) fitting of single time-derivative thermogravimetric curves (DTG) obtained at different temperatures versus time, and (2) fitting of the rate parameter values obtained at different temperatures versus temperature. The first step makes use of derivative of logistic functions. For the second step, the dependence of the rate factor on temperature is evaluated. That separation of the curve fitting from the analysis of the rate factor resulted to be very flexible since it proved to work for previous crystallization studies and now for thermal degradation of cellulose.

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Kinetics of diuron under aerobic condition and residue analysis in sugarcane under subtropical field conditions

Environmental Technology ◽

10.1080/09593330.2017.1380709 ◽

2017 ◽

Vol 40 (1) ◽

pp. 86-93 ◽

Cited By ~ 4

Author(s):

Shishir Tandon ◽

Ravi Pant

Keyword(s):

Residue Analysis ◽

Aerobic Condition ◽

Field Conditions ◽

Kinetics Of

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A kinetic model of ferrous iron oxidation by Acidithiobacillus ferrooxidans in a batch culture

Chemical Industry and Chemical Engineering Quarterly ◽

10.2298/ciceq0502059s ◽

2005 ◽

Vol 11 (2) ◽

pp. 59-62 ◽

Cited By ~ 5

Author(s):

Dragisa Savic ◽

Miodrag Lazic ◽

Vlada Veljkovic ◽

Miroslav Vrvic

Keyword(s):

Kinetic Model ◽

Acidithiobacillus Ferrooxidans ◽

Ferrous Iron ◽

Bubble Column ◽

Iron Oxidation ◽

Yield Coefficient ◽

Transfer Rates ◽

Ferrous Iron Oxidation ◽

Menten Kinetic ◽

Kinetics Of

The batch oxidation kinetics of ferrous iron by Acidithiobacillus ferrooxidans were examined at different oxygen transfer rates and pH in an aerated stirred tank and a bubble column. The microbial growth, oxygen consumption rate and ferrous and ferric iron were monitored during the biooxidation. A kinetic model was established on the basis of the Michaelis-Menten kinetic equation for bacterial growth and the constants estimated from experimental data (maximum specific growth rate 0.069 h-1, saturation constant 2.9 g/dm3, and biomass yield coefficient based on ferrous iron 0.003 gd.w./gFe). Values calculated from the model agreed well with the experimental ones regardless of the bioreactor type and pH conditions.

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Reduction kinetics of iron powder

Soviet Powder Metallurgy and Metal Ceramics ◽

10.1007/bf00802607 ◽

1970 ◽

Vol 9 (6) ◽

pp. 442-446

Author(s):

I. D. Radomysel'skii ◽

A. V. Zborovskii

Keyword(s):

Iron Powder ◽

Reduction Kinetics ◽

Kinetics Of

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KINETICS OF PHOSPHORUS RELEASE AND UPTAKE BY MICRO-ORGANISMS UNDER CYCLIC ANAEROBIC/ AEROBIC CONDITIONS — EXPERIMENTAL STUDY

Water Pollution Research and Control Brighton ◽

10.1016/b978-1-4832-8439-2.50171-1 ◽

1988 ◽

pp. 1717-1720

Author(s):

Motoyuki Suzuki ◽

Cho-Hee Yoon

Keyword(s):

Experimental Study ◽

Phosphorus Release ◽

Aerobic Conditions ◽

Micro Organisms ◽

Kinetics Of

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Kinetics of mechanochemical transformations

Physical Chemistry Chemical Physics ◽

10.1039/d0cp01658f ◽

2020 ◽

Vol 22 (26) ◽

pp. 14489-14502 ◽

Cited By ~ 3

Author(s):

Maria Carta ◽

Evelina Colacino ◽

Francesco Delogu ◽

Andrea Porcheddu

Keyword(s):

Kinetic Model ◽

Mechanical Processing ◽

Statistical Nature ◽

Kinetics Of

To help understanding the mechanisms underlying mechanochemical transformations, we propose a kinetic model that relates macroscopic and microscopic scales while accounting for the statistical nature of the mechanical processing of powder.

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