Article
Thermodynamics
Nicolas Sbirrazzuoli
Summary: This study simulated three different complex multi-step reaction mechanisms, including parallel-competing, consecutive, and parallel-independent reactions, using two sets of different kinetic parameters. The analysis of thermoanalytical curves and E alpha-dependencies, combined with model-fitting approach, can elucidate reaction mechanisms and estimate kinetic parameters for each step.
THERMOCHIMICA ACTA
(2023)
Article
Thermodynamics
Ayokunle O. Balogun, Adekunle A. Adeleke, Peter P. Ikubanni, Samuel O. Adegoke, Abdulbaset M. Alayat, Armando G. McDonald
Summary: The study investigated the thermal degradation of Digitaria sanguinalis in nitrogen (pyrolysis) and air (combustion) atmospheres through thermogravimetric analysis. The grass showed higher reaction rate in the oxidative process of combustion, with different activation energy profiles in nitrogen and air.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Hemant Kumar Balsora, S. Kartik, Thomas J. Rainey, Ali Abbas, Jyeshtharaj Bhalchandra Joshi, Abhishek Sharma, Anand Gupta Chakinala
Summary: This study aimed to investigate the pyrolysis kinetics of agricultural biomass residues using thermogravimetric analysis. Various methods were employed to estimate the activation energy and model the kinetics. The results provided insights into the reaction orders and kinetic models in different temperature zones for the biomass residues.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Polymer Science
Hongli Jia, Yingdan Zhu, Chun Yan, Mingda Chen, Gang Chen, Dong Liu
Summary: A new method is developed in this paper to improve the accuracy of fitting models by specifying the initial curing degree, and the curing kinetics of various resin systems are examined and compared. The results show that the utilization of initial curing degree promotes the accuracy of fitting models.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Energy & Fuels
Ramesh Naidu Mandapati, Praveen Kumar Ghodke
Summary: The study investigated the pyrolysis of cotton stalk to determine its intrinsic kinetic parameters and understand the pyrolysis process. Model-fitting and model-free methods were used to assess the kinetics, revealing that simple reaction models were insufficient to explain the pyrolysis mechanism. Further investigation with complex reaction mechanisms and different methods yielded average activation energy values for fractional conversion values of 0.05 > alpha > 0.7.
Article
Materials Science, Ceramics
Glauco V. P. Bezerra, Leyliane S. Everton, Alberth M. C. Costa, Alex Rojas, Alisson M. Rodrigues, Aluisio A. Cabral
Summary: The present study estimated the crystallization activation energy, Eα, the pre-exponential term, A, and the reaction model, g(α), of a lithium disilicate glass using model-free and model-fitting approaches. The results showed that Eα, A, and g(α) were influenced by particle size. PD1 crystallized in a single step, mainly governed by the surface. In contrast, the overall crystallization of PD5 was more complex and could be described by different Avrami reaction models with varying n values.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Thermodynamics
P. Budrugeac, A. Cucos, R. Dascalu, I Atkinson, P. Osiceanu
Summary: A low density polyethylene (LDPE) was characterized and its kinetic behavior was analyzed using various analysis methods. The study determined a suitable kinetic scheme for the thermal decomposition of LDPE, which is important for predicting its thermal behavior and designing pyrolysis reactors for waste conversion.
THERMOCHIMICA ACTA
(2022)
Article
Polymer Science
Hamayoun Mahmood, Ahmad Shakeel, Ammar Abdullah, Muhammad Ilyas Khan, Muhammad Moniruzzaman
Summary: Thermal kinetic modeling is crucial for sustainable processes involving lignocellulosic fuels, with thermal decomposition of three materials analyzed using both model-fitting and isoconversional methods. The activation energy order based on model-free analysis is rice husk > bagasse > wheat straw, recommending isoconversional approach as more realistic and precise for modeling non-isothermal kinetics of lignocellulosic residues.
Article
Chemistry, Analytical
Manel Nasfi, Marion Carrier, Sylvain Salvador
Summary: This paper demonstrates the feasibility of using quantitative data obtained from a micropyrolyzer coupled to a mass spectrometry technique for determining the kinetics of biomass devolatilization. The main challenge lies in assessing the time lag caused by transport phenomena between the reactor and the detector. The authors developed an experimental method to derive real-time biomass devolatilization profiles and obtained preliminary kinetic parameters using the Friedman method combined with real-time temperature history.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Energy & Fuels
Endong Miao, Yi Du, Xufan Zheng, Xuguang Zhang, Zhuo Xiong, Yongchun Zhao, Junying Zhang
Summary: The suitability of fly ash from a 600 MW circulating fluidized bed boiler for CO2 sequestration through a direct aqueous route was evaluated. The fly ash exhibited favorable carbon capture characteristics and a maximum CO2 sequestration capacity of 0.128 g CO2/g CFA with a carbonation efficiency of 78.17%. A modified shrinking core model was proposed to determine the gas-liquid-solid carbonation kinetics, considering gaseous CO2 dissolution and time-dependent diffusion. The model accurately represents the carbonation process and can be applied to other solid wastes.
Article
Thermodynamics
Jun Zhao, Zhili Chen, Huiting Bian
Summary: This study aimed to determine the thermal kinetic triplets and elucidate the reaction mechanism of poly(vinyl alcohol) using an efficient combined kinetic approach. Thermogravimetric pyrolysis profiles were obtained with different heating rates, and the thermal decomposition behavior was characterized. Various model free methods were applied to calculate the activation energies at different conversion extents. The appropriate reaction mechanism functions were determined using linear CR and non-linear masterplots model fitting methods. A combined kinetic analysis was conducted to obtain accurate reaction models for two distinct pyrolysis steps. This work provides a precise methodology to understand the thermal behavior and decomposition mechanism of poly(vinyl alcohol) and improve kinetics prediction accuracy.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Polymer Science
Xiangning Wen, Yunlan Su, Shaofan Li, Weilong Ju, Dujin Wang
Summary: The study demonstrated that PEG-g-SiO2 can significantly increase the crystallinity and crystallization temperature of PEO matrix, affecting the crystalline morphology and rate of PEO. The good dispersion of PEG-g-SiO2 in the PEO matrix contributes to enhancing the primary nucleation rate.
Article
Green & Sustainable Science & Technology
Kiattikhoon Phuakpunk, Benjapon Chalermsinsuwan, Suttichai Assabumrungrat
Summary: The study aimed to develop a proper kinetics investigation method for pyrolysis reaction and compared three favorite model-free methods, showing that using Friedman method parameters in a conversion range of 0.1-0.6 gave conversion curves mostly in good agreement with experimental results. Mixing different biomasses showed varying effects on activation energy in different temperature ranges.
Article
Thermodynamics
Nicolas Sbirrazzuoli
Summary: Four complex mechanisms of two parallel independent reactions were simulated under various isothermal and nonisothermal conditions based on the isoconversional methods of Vyazovkin and Friedman. The study showed that accurate simulations can be performed in a model-free way, with higher accuracy obtained for mechanisms involving more separated individual steps. The proposed methods are applicable to both DSC and TG data.
THERMOCHIMICA ACTA
(2021)
Article
Polymer Science
Dominik Wolosz, Pawel G. Parzuchowski, Karolina Rolinska
Summary: This work presents an eco-friendly synthetic pathway for the production of non-isocyanate poly(carbonate-urethane)s (NIPCUs) from carbon dioxide and organic carbonates. The obtained NIPCUs exhibit comparable mechanical properties to conventional polyurethane elastomers. The study also investigates the influence of polyurethane structure on the mechanical and thermal properties of the obtained polymers.
Article
Polymer Science
Antonia Omazic, Gernot Oreski, Michael Edler, Gabriele Christine Eder, Christina Hirschl, Gerald Pinter, Matko Erceg
JOURNAL OF APPLIED POLYMER SCIENCE
(2020)
Article
Thermodynamics
Sanja Perinovic Jozic, Drazan Jozic, Matko Erceg, Branka Andricic, Sigrid Bernstorff
THERMOCHIMICA ACTA
(2020)
Article
Thermodynamics
Natasa Stipanelov Vrandecic, Matko Erceg, Branka Andricic, Ignazio Blanco, Francesco A. Bottino
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Article
Green & Sustainable Science & Technology
Irma Kremer, Tihomir Tomic, Zvonimir Katancic, Zlata Hrnjak-Murgic, Matko Erceg, Daniel R. Schneider
Summary: This study assessed the thermogravimetric behavior and kinetic parameters of real-world plastic waste mixture with added nickel- and iron-based catalysts on gamma-aluminium oxide support, revealing a complex decomposition mechanism. The average apparent activation energy for the waste mixture was found to decrease with the addition of catalysts, with iron-based catalyst causing a 15.6% decrease and nickel-based catalyst causing a 9.8% decrease.
CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY
(2021)
Editorial Material
Thermodynamics
Stefano Vecchio Ciprioti, Andrei Rotaru, Ignazio Blanco, Matko Erceg
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Article
Thermodynamics
Jelena Jakic, Mice Jakic, Miroslav Labor
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2020)
Article
Environmental Sciences
Irma Kremer, Tihomir Tomic, Zvonimir Katancic, Matko Erceg, Sasa Papuga, Jelena Parlov Vukovic, Daniel Rolph Schneider
Summary: The text discusses the issue of post-consumer waste plastics that cannot be mechanically recycled and explores the use of pyrolysis as a potential solution. It also highlights the importance of determining the actual composition of non-recyclable plastics for effective recovery.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Multidisciplinary Sciences
Irma Kremer, Tihomir Tomic, Zvonimir Katancic, Zlata Hrnjak-Murgic, Matko Erceg, Stefano Vecchio Ciprioti, Daniel Rolph Schneider
Summary: This study investigated the catalytic pyrolysis of multi-layered plastic food packaging waste and determined its thermal behavior, kinetic parameters, and kinetic model. It was found that the pyrolysis process consisted of multiple decomposition stages and different reaction types. The doping of the catalyst lowered the activation energy of the reaction and enhanced the reactivity on the catalyst surface.
Article
Thermodynamics
Irena Kresic, Natasa Stipanelov Vrandecic, Matko Erceg, Zoran Grubac, Mia Galic
Summary: This study focuses on the characterization of a series of solid nanocomposite polymer electrolytes consisting of PEO, POSS, and LiBOB. The addition of LiBOB and POSS leads to a decrease in the crystallinity and melting temperatures of PEO, while the glass transition temperatures increase. The thermal stability of the polymer electrolytes was investigated, showing a more complex degradation compared to pure PEO. However, the polymer electrolytes remain thermally stable enough for their applications in electrochemical devices. The incorporation of LiBOB and POSS positively influences the ionic conductivity of PEO. The optimized system was determined based on the ionic conductivity of the nanocomposites.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Chemistry, Multidisciplinary
M. Erceg, M. Jakic, I Kresic
KEMIJA U INDUSTRIJI-JOURNAL OF CHEMISTS AND CHEMICAL ENGINEERS
(2020)
Article
Chemistry, Multidisciplinary
Vesna Ocelic Bulatovic, Mice Jakic, Dajana Kucic Grgic
ACTA CHIMICA SLOVENICA
(2020)
Article
Chemistry, Multidisciplinary
N. Stipanelov Vrandecic, M. Erceg, B. Andricic, P. Cerdic
KEMIJA U INDUSTRIJI-JOURNAL OF CHEMISTS AND CHEMICAL ENGINEERS
(2020)
Article
Chemistry, Multidisciplinary
M. Erceg, P. Tutman, D. Bojanic Varezic, A. Bobanovic
KEMIJA U INDUSTRIJI-JOURNAL OF CHEMISTS AND CHEMICAL ENGINEERS
(2020)
