Non-Isothermal Kinetics Studies on the Thermal Decomposition of Boron Doped g-C3N4 by TG Method

2012 ◽  
Vol 550-553 ◽  
pp. 2660-2667 ◽  
Author(s):  
Zu Sheng Hang ◽  
Hui Ya Wang ◽  
San Jiu Ying
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Closed System ◽  
Integral Method ◽  
Iterative Procedure ◽  
Isothermal Kinetics ◽  
Kinetic Function ◽  
Boron Trioxide ◽  
Kinetics Studies ◽  
Boron Doped

Melamine and boron trioxide (B2O3) were directly pyrolyzed in semi-closed system to prepare Boron doped g-C3N4. The analytic results of XRD, XPS and FTIR proved that g-C3N4is doped by boron successfully. The thermal decomposition of B doped g-C3N4has been studied using TGA-DTG technique. The iterative procedure method was employed to calculate the activation energy Eα, and the most reasonable kinetic function of the decomposition of B doped g-C3N4was confirmed by the integral method with 36 types of kinetic function .

Non-isothermal kinetics studies on the thermal decomposition of zinc hydroxide carbonate

2005 ◽  
Vol 438 (1-2) ◽  
pp. 102-106 ◽  
Author(s):  
Zhongjun Li ◽  
Xiaoqing Shen ◽  
Xun Feng ◽  
Peiyuan Wang ◽  
Zhishen Wu
Keyword(s):  
Thermal Decomposition ◽  
Isothermal Kinetics ◽  
Zinc Hydroxide ◽  
Kinetics Studies ◽  
Zinc Hydroxide Carbonate

The Most Probable Mechanism Function of PVC Thermal Decomposition

2014 ◽  
Vol 989-994 ◽  
pp. 660-664
Author(s):  
Ning Xu ◽  
Guang Cheng Li ◽  
Rong Feng Guan
Keyword(s):  
Thermal Decomposition ◽  
Heating Rate ◽  
Polyvinyl Chloride ◽  
Decomposition Rate ◽  
Integral Method ◽  
Differential Method ◽  
Probable Mechanism ◽  
Isothermal Kinetics ◽  
Thermal Decomposition Process ◽  
Mechanism Function

The most probable mechanism function of non-isothermal kinetics about polyvinyl chloride thermal decomposition process was studied by the differential method (A-B-S)-integral method (C-R). The results show that the most probable mechanism function accorded with the mechanism function A1.5 when the heating rate of was 5 °C/min and the decomposition rate was 0.01-0.10.

scholarly journals A Comparative Study on Suitability of Model-Free and Model-Fitting Kinetic Methods to Non-Isothermal Degradation of Lignocellulosic Materials

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2504
Author(s):  
Hamayoun Mahmood ◽  
Ahmad Shakeel ◽  
Ammar Abdullah ◽  
Muhammad Khan ◽  
Muhammad Moniruzzaman
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Wheat Straw ◽  
Rice Husk ◽  
Model Fitting ◽  
Isothermal Kinetics ◽  
Lignocellulosic Materials ◽  
Model Free ◽  
Dimensional Diffusion ◽  
Percentage Difference

The thermal kinetic modeling is crucial for development of sustainable processes where lignocellulosic fuels are a part of chemical system and their thermal degradation eventuates. In this paper, thermal decomposition of three lignocellulosic materials (bagasse, rice husk, and wheat straw) was obtained by the thermogravimetric (TG) technique and kinetics was analyzed by both model-fitting and isoconversional (model-free) methods to compare their effectiveness. Two models selected from each class include Arrhenius and Coats–Redfern (model-fitting), and Kissinger–Akahira–Sunose (KAS) and Flynn–Wall–Ozawa (FWO) (model-free). The formal model-fitting approach simulating the thermal decomposition of solids by assuming a fixed mechanism was found to be unduly facile. However, activation energy (E) values calculated from two model-fitting techniques were considerably different from each other with a percentage difference in the range of 1.36% to 7.65%. Particularly, both model-fitting methods predicted different reaction mechanism for thermal disintegration of lignocellulosic materials (two-dimensional diffusion (D2) by Arrhenius and one-dimensional diffusion (D1) by Coat–Redfern method). Conversely, the model-free routine offers a transformation of mechanism and activation energy values throughout reaction and is, therefore, more authentic to illustrate the complexity of thermal disintegration of lignocellulosic particles. Based on the model-free kinetic analysis, the lignocellulosic materials may be devised in following order of activation energy: rice husk > bagasse > wheat straw, by both KAS and FWO methods with a percentage difference no more than 0.84% for fractional conversion up to 0.7. Isoconversional approach could be recommended as more realistic and precise for modeling non-isothermal kinetics of lignocellulosic residues compared to model-fitting approach.

Application of Calculus Equation in Solving Thermal Decomposition Kinetics Parameters of Flame Retardant Wood

2014 ◽  
Vol 983 ◽  
pp. 190-193
Author(s):  
Cai Yun Sun ◽  
Yong Li Yang ◽  
Ming Gao
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Thermal Degradation ◽  
Phosphoric Acid ◽  
Flame Retardant ◽  
Kinetic Parameters ◽  
Flame Retardancy ◽  
Decomposition Kinetics ◽  
Thermal Decomposition Kinetics ◽  
Kinetics Parameters

Wood has been treated with amino resins and amino resins modified with phosphoric acid to impart flame retardancy. The thermal degradation of samples has been studied by thermogravimetry (TG) in air. From the resulting data, kinetic parameters for different stages of thermal degradation are obtained following the method of Broido. For the decomposition of wood and flame retardant wood, the activation energy is found to decrease from 122 to 72 kJmol-1.

Thermal decomposition and kinetics studies on 1,4-dinitropiperazine (DNP)

2008 ◽  
Vol 151 (2-3) ◽  
pp. 515-521 ◽  
Author(s):  
Qi-Long Yan ◽  
Xiao-Jiang Li ◽  
Han Wang ◽  
Li-Hua Nie ◽  
Ze-Yi Zhang ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Kinetics Studies

Activation energy in the thermal decomposition of MgH2 powders by coupled TG–MS measurements

2013 ◽  
Vol 116 (2) ◽  
pp. 865-874 ◽  
Author(s):  
Renzo Campostrini ◽  
Mahmoud Abdellatief ◽  
Matteo Leoni ◽  
Paolo Scardi
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition

Kinetics Studies for Catalytic Oxidation of Methyl Orange over the Heterogeneous Fe/Beta Catalysts

2013 ◽  
Vol 807-809 ◽  
pp. 361-364
Author(s):  
Fang Guo ◽  
Jun Qiang Xu ◽  
Jun Li
Keyword(s):  
Activation Energy ◽  
Hydrogen Peroxide ◽  
Reaction Mechanism ◽  
Methyl Orange ◽  
Incipient Wetness Impregnation ◽  
Kinetics Studies ◽  
Optimum Reaction ◽  
Catalyst Dosage ◽  
Oxidation Degradation ◽  
Degradation Of Methyl Orange

The Fe/Beta catalysts were prepared by conventional incipient wetness impregnation. The catalysis oxidation degradation of methyl orange was carried out in catalyst and H2O2 process. The results indicated that the catalyst and hydrogen peroxide were more benefit to degradation of methyl orange. The reaction condition was optimized. The optimum reaction process was as follow: iron amount of catalyst was 1.25%, the catalyst dosage and H2O2 concentration was 1 mg/L and 1.5 mg/L, and reaction temperature was 70 °C. The apparent activation energy (65 KJ/mol) was obtained according to the arrhenius formula, which was benefit to study the reaction mechanism.

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