Article
Materials Science, Characterization & Testing
Chunrui Lu, Wenlong Ma, Shuhong Ba, Dongxing Zhang
Summary: This study introduced a method for calculating resin content using thermogravimetric analysis (TGA) for carbon fiber/ poly (ether ether ketone) (CF/PEEK) composites. The TGA curves and DTG curves were divided into four stages, and the resin content was accurately obtained from the transitional stage and stable stage. Results compared with other methods showed that the TGA method was suitable for resin fraction calculation with slight difference.
Article
Chemistry, Physical
Ibrahim Dubdub
Summary: This paper aims to investigate the kinetics of polypropylene (PP) polymer pyrolysis using thermogravimetric analysis (TGA). The results show that the activation energy values for PP polymer pyrolysis at different conversions are in good agreement with the values obtained from four model-free methods. Additionally, the most controlling reaction mechanism identified using Criado's method is the geometrical contraction models-cylinder model.
Article
Energy & Fuels
Wasif Farooq, Imtiaz Ali, Salman Raza Naqvi, Mohd Sajid, Hassnain Abbas Khan, Sagir Adamu
Summary: The study demonstrates that the prepared Ni/theta-Al2O3 catalyst significantly enhances the pyrolytic conversion of Parachlorella kessleri HY-6 by reducing the mean activation energy, leading to improved conversion efficiency.
FRONTIERS IN ENERGY RESEARCH
(2021)
Article
Thermodynamics
Junhui Gong, Mingrui Zhang, Chunjie Zhai
Summary: This study experimentally investigated the auto-ignition of thermally thick PMMA subjected to linearly decreasing heat flux, and revealed the critical conditions and influencing mechanisms of auto-ignition and non-ignition through numerical modeling and comparison with experimental data. It was found that near the critical condition, the critical mass flux is not a reliable ignition criterion, while a composite criterion combining critical mass flux and critical temperature accurately predicts the ignition time.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Heon-Gyeong Lee, Jae-Seung Jung, Jin-Gyu Kim
Summary: Research on insulating materials for HVDC systems has focused on understanding the degradation caused by external environmental factors over time. Accurate measurement of activation energy is crucial for accelerated degradation tests and lifetime analyses. Different analytical methods yield varying activation energy values, highlighting the need for established measurement criteria.
JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY
(2021)
Article
Engineering, Environmental
Ali Zaker, Zhi Chen, Mohammed Zaheer-Uddin, Jianbo Guo
Summary: This study investigates the thermal behaviors, kinetics and thermodynamics of sewage sludge (SS) and low-density polyethylene (LDPE) and their blends during co-pyrolysis, confirming a positive interaction between SS and LDPE leading to improved weight loss rate and devolatilization. The activation energies, Gibbs free energy, and lower difference of enthalpy showed potential for converting bio-solid wastes into bioenergy.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Energy & Fuels
Veeramuthu Ashokkumar, Wei-Hsin Chen, Gopalakrishnan Kumar, Anchittha Satjarak, Wikrom Chanthapatchot, Chawalit Ngamcharussrivichai
Summary: This study successfully produced natural astaxanthin from Haematococcus lacustris using a biorefinery approach and utilized the biomass residue for biochar production. The biochar was further explored for iron oxide reduction, resulting in the production of metallic iron with potential commercial value.
Article
Thermodynamics
Shawki Mazloum, Youssef Aboumsallem, Sary Awad, Nadine Allam, Khaled Loubar
Summary: This study aims to model the plastic pyrolysis process at particle scale for polypropylene and high density polyethylene, using kinetic triplets and appropriate conditions in a thermogravimetric analyzer. The results show that modeling the melting sub-process using the modified apparent heat capacity method, and dividing the cracking phenomena into latent and apparent processes, can help control the error between simulated and measured results at a low level.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Polymer Science
Ibrahim Dubdub
Summary: In this study, thermal cracking of plastic wastes, including polystyrene (PS), low-density polyethylene (LDPE), and polypropylene (PP), was investigated using thermal analysis technique thermogravimetric analyzer (TGA). An artificial neural network (ANN) model was developed to predict the weight fraction of mixed polymers, and the results showed good agreement between the actual and predicted values, indicating the high efficiency of the model in simulating new data.
Article
Polymer Science
Zaid Alhulaybi, Ibrahim Dubdub
Summary: This study investigated the kinetics of PET pyrolysis reactions at different heating rates (2, 5, 10, and 20 K min(-1)) using thermogravimetric analysis (TGA) data. Only one kinetic reaction was observed within the temperature range of 650 to 750 K. Five different model-free models were fitted to the experimental data to obtain the activation energy (E-a) and the pre-exponential factor (A(0)) of the reaction kinetics. The most suitable reaction mechanism was determined using the Coats-Redfern (CR) model equation with the help of a master plot.
Article
Chemistry, Multidisciplinary
Ibrahim Dubdub, Mohammed Al-Yaari
Summary: An artificial neural network (ANN) model was developed to predict the pyrolysis of mixed plastics efficiently, showing excellent agreement with experimental data. A sensitivity analysis revealed that temperature was the most sensitive input parameter in the model.
APPLIED SCIENCES-BASEL
(2021)
Article
Polymer Science
Xinyu Wang, Chenyu Zhou, Shengsong Dai, Junjie Wang, Zhiquan Pan, Hong Zhou
Summary: A bio-based flame retardant PDE was synthesized and applied in epoxy resin, with further modification of the resin by adding chitosan. The modified resins showed excellent flame retardancy and transparency, as well as absorption effect towards ultraviolet light.
JOURNAL OF APPLIED POLYMER SCIENCE
(2022)
Article
Chemistry, Analytical
Youjun Zhang, Guorun Huang, Shirui Yu, Xiaoli Gu, Junmeng Cai, Xingguang Zhang
Summary: The physicochemical properties and pyrolysis kinetics of dried distiller?s grains (DDGs) were investigated, showing high heat content and volatile organic components. The pyrolysis process exhibited varying effective activation energies at different conversion degrees, indicating potential for bioenergy conversion. These findings suggest promising industrial applications of DDGs in producing biofuels and high-value chemicals and materials.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Polymer Science
Zaid Alhulaybi, Ibrahim Dubdub, Mohammed Al-Yaari, Abdulrahman Almithn, Abdullah F. Al-Naim, Haidar Aljanubi
Summary: This study aims to build knowledge on the kinetics of PLA pyrolysis using TGA and four model-free methods (Friedman, FWO, KAS, and Starink), for application in the textile and food packaging fields. The obtained activation energies of PLA pyrolysis by the model-free methods were in good agreement, ranging from 97 to 109 kJ/mol. The best controlling reaction mechanism of PLA pyrolysis was identified as the geometrical contraction model (R2) through the Criado and Coats-Redfern models.
Article
Polymer Science
Ibrahim Dubdub, Mohammed Al-Yaari
Summary: Plastic waste generation has increased significantly over the past 70 years, with more than 50% of municipal plastic waste being composed of PS, PP, and LDPE products. A kinetic model has been developed to describe the thermal decomposition of plastic mixtures, contributing to efficient plastic waste management. Different isoconversional models were used to obtain kinetic parameters, with Coats-Redfern model being the most suitable for determining reaction mechanisms.
Article
Engineering, Chemical
Prashant Mishra, Hari Prasad Uppara, Bishnupada Mandal, Sasidhar Gumma
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2014)
Article
Polymer Science
Ujwala Hujuri, Aloke K. Ghoshal, Sasidhar Gumma
JOURNAL OF APPLIED POLYMER SCIENCE
(2013)
Article
Thermodynamics
Prashant Mishra, Hari Prasad Uppara, Bishnupada Mandal, Sasidhar Gumma
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2012)
Article
Thermodynamics
Debjyoti Sahu, Prashant Mishra, Satyannarayana Edubilli, Anil Verma, Sasidhar Gumma
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2013)
Article
Thermodynamics
Gouri Shankar Cheripally, Ashok Mannava, Gaurav Kumar, Rakeshroshan Gupta, Prabirkumar Saha, Bishnupada Mandal, Ramgopal Uppaluri, Sasidhar Gumma, Aloke Kumar Ghoshal
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2013)
Article
Chemistry, Physical
Prashant Mishra, Satyannarayana Edubilli, Bishnupada Mandal, Sasidhar Gumma
JOURNAL OF PHYSICAL CHEMISTRY C
(2014)
Article
Chemistry, Multidisciplinary
Prashant Mishra, Satyannarayana Edubilli, Hari Prasad Uppara, Bishnupada Mandal, Sasidhar Gumma
Article
Chemistry, Applied
Dheeraj S. Tomar, Mayank Singla, Sasidhar Gumma
MICROPOROUS AND MESOPOROUS MATERIALS
(2011)
Article
Chemistry, Applied
Pradip Chowdhury, Samuel Mekala, Frieder Dreisbach, Sasidhar Gumma
MICROPOROUS AND MESOPOROUS MATERIALS
(2012)
Article
Chemistry, Applied
Prashant Mishra, Satyannarayana Edubilli, Bishnupada Mandal, Sasidhar Gumma
MICROPOROUS AND MESOPOROUS MATERIALS
(2013)
Article
Engineering, Chemical
Prashant Mishra, Samuel Mekala, Freider Dreisbach, Bishnupada Mandal, Sasidhar Gumma
SEPARATION AND PURIFICATION TECHNOLOGY
(2012)
Article
Chemistry, Physical
Debjyoti Sahu, Prashant Mishra, Nitun Das, Anil Verma, Sasidhar Gumma
SURFACE REVIEW AND LETTERS
(2014)
Article
Chemistry, Physical
Pradip Das, Bishnupada Mandal, Sasidhar Gumma
APPLIED SURFACE SCIENCE
(2020)
Article
Chemistry, Inorganic & Nuclear
Abhik Bhattacharjee, Mihir Kumar Purkait, Sasidhar Gumma
DALTON TRANSACTIONS
(2020)
