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Katia Tannous - One of the best experts on this subject based on the ideXlab platform.
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Drying and Thermal Decomposition Kinetics of sugarcane straw by nonisoThermal thermogravimetric analysis.
Bioresource Technology, 2018Co-Authors: Yesid Javier Rueda-ordóñez, Katia TannousAbstract:Abstract This work aims the study of the drying (25 ± 3 °C–150 °C) and Thermal Decomposition (150–900 °C) of sugarcane straw Kinetics in inert and oxidative atmospheres by nonisoThermal thermogravimetry (TG) analysis using heating rates of 2.5, 5 and 10 °C/min. The drying kinetic analysis was carried out using five models, Lewis, Page, Henderson and Pabis, Midilli and Logaritmic, obtaining the activation energy of 1.25 kJ/mol, in which the Page’s model showed to be the most accurate description for both atmospheres. The Thermal Decomposition Kinetics was analyzed through three consecutive reactions scheme, obtaining activation energies of 130, 200 and 56 kJ/mol as well as 200, 350 and 100 kJ/mol for both atmospheres, respectively. The consecutive reaction scheme allowed an excellent agreement between experimental and modeled data, providing a quality of fit similar than the obtained with independent parallel reactions scheme.
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Thermal Decomposition Kinetics modeling of energy cane saccharum robustum
Thermochimica Acta, 2017Co-Authors: Vinicius Souza De Carvalho, Katia TannousAbstract:Abstract This work aims to study the Thermal Decomposition Kinetics of energy cane Saccharum robustum . The experiments were carried out in a thermogravimetric analyzer at heating rates of 5, 10 and 20 °C/min under nitrogen atmosphere and mean particle diameter of 253.5 μm. Three Thermal Decomposition stages were identified: dehydration, pyrolysis and carbonization. The activation energies were determined through three model-free methods (Friedman, Flynn-Wall-Ozawa, and Vyazovkin) varying between 107.5 and 204 kJ/mol. The master plots showed different representations of conversion functions (reaction orders from 2 to 7). The linear model fitting method validated the activation energy (177.1 kJ/mol) obtained by single-step reaction. Moreover, a multi-step method was proposed considering four independent parallel reactions (extractives, hemicellulose, cellulose, and lignin) obtaining activation energies from 60 to 181 kJ/mol, pre-exponential factor from 1.1 ∙ 10 2 to 5.8 ∙ 10 12 1/s, 1st and 3rd reaction orders, and compositions from 0.12 to 0.43 with high quality of fit.
Ai Xiaokang - One of the best experts on this subject based on the ideXlab platform.
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SYNTHESIS AND Thermal Decomposition Kinetics OF LANTHANUM(III) COMPLEX WITH UNSYMMETRICAL SCHIFF BASE
Journal of the Chilean Chemical Society, 2007Co-Authors: Bi Caifeng, Ai Xiaokang, Fan Yuhua, Bi Shuangyu, Xie SitanAbstract:A new unsymmetrical solid Schiff base (LLi) was synthesized using L-lysine, salicylaldehyde and furfural. Solid lanthanum(III) complex of this ligand [LaL(NO3)]NO3-2H20 have been prepared and characterized by elemental analyses, IR , UV and molar conductance .The Thermal Decomposition Kinetics of the complex for the second stage was studied under non-isoThermal condition by TG and DTG methods. The kinetic equation may be expressed as : da/dt = A · e-ElRT. (1-a)2 y The kinetic parameters(Δ, A), activation entropy ΔS* and activation free-energy ΔG* were also gained, E = 212.7 kJ/molΔlnLA =44.12, ℘S*=116.8 J/mol-KΔΔG*=148.1 kJ/mol
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Synthesis and Thermal Decomposition Kinetics of Er(III) complex with unsymmetrical Schiff-base ligand
Journal of Coordination Chemistry, 2006Co-Authors: Fan Yuhua, Ai Xiaokang, Bi Cai-feng, Guo Feng, Xue Yao-sen, He Xuetao, Xiao YanAbstract:A new unsymmetrical, solid, Schiff base (H2LLi) was synthesized using L-lysine, o-vanillin and salicylaldehyde. An Er(III) complex of this ligand [Er(H2L)(NO3)](NO3) · 2H2O was prepared and characterized by elemental analysis, IR, UV and molar conductance. The Thermal Decomposition Kinetics of the complex for the second stage was studied under non-isoThermal conditions by TG and DTG methods. The kinetic equation may be expressed as, dα/dt = A · e−E/RT · 1/2(1 − α)[−ln(1 − α)]−1. The kinetic parameters (E, A), activation entropy S ≠ and activation free-energy G ≠ were also determined.
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Synthesis and Thermal Decomposition Kinetics of Th(IV) complex with unsymmetrical Schiff base ligand
Journal of Radioanalytical and Nuclear Chemistry, 2005Co-Authors: Fan Yuhua, Bi Cai-feng, Liu Siquan, Yang Li-rong, Liu Feng, Ai XiaokangAbstract:A new unsymmetrical Schiff base ligand (H2LLi) was synthesized using L-lysine, o-vanillin and salicylaladyde. Thorium(IV) complex of this ligand [Th(H2L)(NO3)](NO3)2 .3H2O have been prepared and characterized by elemental analyses, IR, UV and molar conductance. The Thermal Decomposition Kinetics of the complex for the second stage was studied under non-isoThermal condition by TG and DTG methods. The kinetic equation may be expressed as: dα/dt=A .e-E/RT.1/2 (1-α).[-ln(1-α)]-1. The kinetic parameters (E, A), activation entropy ΔS ¹ and activation free-energy ΔG ¹ were also calculated.
Fan Yuhua - One of the best experts on this subject based on the ideXlab platform.
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SYNTHESIS AND Thermal Decomposition Kinetics OF LANTHANUM(III) COMPLEX WITH UNSYMMETRICAL SCHIFF BASE
Journal of the Chilean Chemical Society, 2007Co-Authors: Bi Caifeng, Ai Xiaokang, Fan Yuhua, Bi Shuangyu, Xie SitanAbstract:A new unsymmetrical solid Schiff base (LLi) was synthesized using L-lysine, salicylaldehyde and furfural. Solid lanthanum(III) complex of this ligand [LaL(NO3)]NO3-2H20 have been prepared and characterized by elemental analyses, IR , UV and molar conductance .The Thermal Decomposition Kinetics of the complex for the second stage was studied under non-isoThermal condition by TG and DTG methods. The kinetic equation may be expressed as : da/dt = A · e-ElRT. (1-a)2 y The kinetic parameters(Δ, A), activation entropy ΔS* and activation free-energy ΔG* were also gained, E = 212.7 kJ/molΔlnLA =44.12, ℘S*=116.8 J/mol-KΔΔG*=148.1 kJ/mol
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Synthesis and Thermal Decomposition Kinetics of Er(III) complex with unsymmetrical Schiff-base ligand
Journal of Coordination Chemistry, 2006Co-Authors: Fan Yuhua, Ai Xiaokang, Bi Cai-feng, Guo Feng, Xue Yao-sen, He Xuetao, Xiao YanAbstract:A new unsymmetrical, solid, Schiff base (H2LLi) was synthesized using L-lysine, o-vanillin and salicylaldehyde. An Er(III) complex of this ligand [Er(H2L)(NO3)](NO3) · 2H2O was prepared and characterized by elemental analysis, IR, UV and molar conductance. The Thermal Decomposition Kinetics of the complex for the second stage was studied under non-isoThermal conditions by TG and DTG methods. The kinetic equation may be expressed as, dα/dt = A · e−E/RT · 1/2(1 − α)[−ln(1 − α)]−1. The kinetic parameters (E, A), activation entropy S ≠ and activation free-energy G ≠ were also determined.
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Synthesis and Thermal Decomposition Kinetics of Th(IV) complex with unsymmetrical Schiff base ligand
Journal of Radioanalytical and Nuclear Chemistry, 2005Co-Authors: Fan Yuhua, Bi Cai-feng, Liu Siquan, Yang Li-rong, Liu Feng, Ai XiaokangAbstract:A new unsymmetrical Schiff base ligand (H2LLi) was synthesized using L-lysine, o-vanillin and salicylaladyde. Thorium(IV) complex of this ligand [Th(H2L)(NO3)](NO3)2 .3H2O have been prepared and characterized by elemental analyses, IR, UV and molar conductance. The Thermal Decomposition Kinetics of the complex for the second stage was studied under non-isoThermal condition by TG and DTG methods. The kinetic equation may be expressed as: dα/dt=A .e-E/RT.1/2 (1-α).[-ln(1-α)]-1. The kinetic parameters (E, A), activation entropy ΔS ¹ and activation free-energy ΔG ¹ were also calculated.
D. S. Kim - One of the best experts on this subject based on the ideXlab platform.
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Cure and Thermal Decomposition Kinetics of a DGEBA/amine system modified with epoxidized soybean oil
Journal of Thermal Analysis and Calorimetry, 2020Co-Authors: Y. J. Woo, D. S. KimAbstract:In this study, epoxidized soybean oil (ESO) was added to a typical diglycidyl ether of bisphenol A (DGEBA) epoxy resin system with an amine curing agent, and the cure and Thermal Decomposition Kinetics of the epoxy resin system were investigated by Thermal analyses. ESO content in the epoxy resin system was changed up to 30%, and the stoichiometric amount of ethylene diamine was used. DSC was used for cure Kinetics analysis, and TGA was used for Thermal Decomposition Kinetics analysis. FTIR was used to check the completeness of the polymerization reaction of the cured epoxy resin samples for TGA. With increasing ESO content, cure rate decreased and the beginning temperature of Thermal Decomposition lowered. The cure and Thermal Decomposition Kinetics of the epoxy resin system could be successfully analyzed by the autocatalytic reaction mechanism and the Ozawa method respectively.
Zhao Hong-kun - One of the best experts on this subject based on the ideXlab platform.
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Research on Thermal Decomposition Kinetics of Potassium Oxalate-Hydrogen Peroxide
Journal of Natural Science of Hunan Normal University, 2008Co-Authors: Zhao Hong-kunAbstract:The article introduces the Thermal Decomposition Kinetics of potassium oxalate-hydrogen peroxide in nitrogen,using the programmed temperature method and NETZSCH STA409 PC/PG Comprehensive Thermal Analyzer,measures the sample's TG and DSC curves in the condition of different heating rates in nitrogen,and analyses the Kinetics model of Thermal Decomposition by the multiple nonlinear regression.The result shows the heat degradation activation energy of potassium oxalate-hydrogen peroxide in nitrogen is 119.5 kJ·mol-1,and its Thermal Decomposition mechanism can be described with Prout-Tompkins Model(Bna) and Avrami-Erofeev Model(A2).
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Theoretical Analysis of the Thermal Decomposition Kinetics of Sodium Percarbonate and Its Experimental Verification
Journal of Nantong University, 2006Co-Authors: Zhao Hong-kunAbstract:In this paper,the preparation of sodium percarbonate in modified wet method was referred and the experiment for Decomposition of sodium percarbonate in nitrogen gas and air was provided.The Thermal Decomposition Kinetics experiment of sodium percarbonate was statistically designed in theory and the optimum experimental position was determined.The results were confirmed by the experiment that the optimum experimental positions were 10 percent and 85 percent of reaction fraction.When the experiment was done at the two points,the relative error of k was least.