Thermal degradation of typical plastics under high heating rate conditions by TG-FTIR: Pyrolysis behaviors and kinetic analysis

Xu, Fanfan; Wang, Bo; Yang, Dan; Hao, Junhui; Qiao, Yingyun; Tian, Yuanyu

doi:10.1016/j.enconman.2018.06.047

Cited by 251 publications

(106 citation statements)

References 42 publications

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“…The main component of SY was polypropylene (PP) whose pyrolysis was the free-radical irregular degradation reaction, during which chain scission occurred randomly on the main chain, generating products with a relatively low molecular weight ( Singh and Sharma, 2008 ). Consistent with our findings, the PP pyrolysis was reported to occur between 391 and 551 °C ( Xu et al, 2018b ). The second stage involved the secondary cracking of the pyrolysis products, or the degradation of the recalcitrant and stable substances between 661.9 and 759.5 °C with a mass loss of 10.74 % and a maximum mass loss rate of 2.99 %/min at 738.3 °C ( Table 3 ).…”

Section: Resultssupporting

confidence: 92%

Pyrolysis dynamics of two medical plastic wastes: Drivers, behaviors, evolved gases, reaction mechanisms, and pathways

Ding

Huashan²,

Liu

et al. 2021

Journal of Hazardous Materials

110

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Section: Resultssupporting

confidence: 92%

Pyrolysis dynamics of two medical plastic wastes: Drivers, behaviors, evolved gases, reaction mechanisms, and pathways

Ding

Huashan²,

Liu

et al. 2021

Journal of Hazardous Materials

110

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“…However, all calculated values, by all the five models, are very close to some of the published values [9,10,15,16]. In addition, the A values, calculated by all five methods, increase as the E value increases and this is in a total agreement with the published data [24].…”

Section: Model-fitting Kinetics Calculationsupporting

confidence: 86%

“…However, the thermal decomposition on-set, peak and final temperatures, extracted from the TG and DTG curves, were observed at higher temperatures as heating rate increased from 5 to 40 K min −1 as shown in Figures 1 and 2. This range of heating rates is considered as a reasonable and moderate range compared with low range of heating rates (5, 10, 20 K min −1 ) [21] and high range of heating rates (100, 300, 500 K min −1 ) [24]. In addition, the decomposition rate increased as the heating rate increased.…”

Section: Tg-dtg Analysis Of Ldpementioning

confidence: 91%

“…Usually, when most of model-free equations are derived, the reaction order (n) is assumed to be first-order reaction [23]. However, the model-fitting methods are used for different reaction orders (n = 1, 2 or 3) [24]. Table 3 shows kinetic equations of three of the most used model-free methods and Table 4 represents equations of two widely used model-fitting methods [11,18,21,[23][24][25][26].…”

Section: Kinetic Theorymentioning

confidence: 99%

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Pyrolysis of Low Density Polyethylene: Kinetic Study Using TGA Data and ANN Prediction

Dubdub

Al-Yaari

2020

Polymers

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Pyrolysis of waste low-density polyethylene (LDPE) is considered to be a highly efficient, promising treatment method. This work aims to investigate the kinetics of LDPE pyrolysis using three model-free methods (Friedman, Flynn-Wall-Qzawa (FWO), and Kissinger-Akahira-Sunose (KAS)), two model-fitting methods (Arrhenius and Coats-Redfern), as well as to develop, for the first time, a highly efficient artificial neural network (ANN) model to predict the kinetic parameters of LDPE pyrolysis. Thermogravimetric (TG) and derivative thermogravimetric (DTG) thermograms at 5, 10, 20 and 40 K min−1 showed only a single pyrolysis zone, implying a single reaction. The values of the kinetic parameters (E and A) of LDPE pyrolysis have been calculated at different conversions by three model-free methods and the average values of the obtained activation energies are in good agreement and ranging between 193 and 195 kJ mol−1. In addition, these kinetic parameters at different heating rates have been calculated using Arrhenius and Coats-Redfern methods. Moreover, a feed-forward ANN with backpropagation model, with 10 neurons in two hidden layers and logsig-logsig transfer functions, has been employed to predict the thermogravimetric analysis (TGA) kinetic data. Results showed good agreement between the ANN-predicted and experimental data (R > 0.9999). Then, the selected network topology was tested for extra new input data with a highly efficient performance.

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“…Extensive research on the pyrolysis of a single type of plastic waste such as high-density polyethylene (HDPE) [8,9], low-density polyethylene (LDPE) [9,10], polyvinyl chloride (PVC) [9,[11][12][13], polypropylene (PP) [9,12,14], polycarbonate (PC) [15], and polystyrene (PS) [9,16,17] has been conducted. Although mixed plastic waste is the representative type of plastic waste worldwide, a limited number of works on the pyrolysis of mixed plastic waste plastic has been performed.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis of Mixed Plastic Waste: I. Kinetic Study

Dubdub

Al-Yaari

2020

Materials

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Plastic wastes have become one of the biggest global environmental issues and thus recycling such massive quantities is targeted. Low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), and polystyrene (PS) are considered among the main types of plastic wastes. Since pyrolysis is one of the most promising recycling techniques, this work aims to build knowledge on the co-pyrolysis of mixed polymers using two model-fitting (Criado and Coats–Redfern) methods. Seventeen co-pyrolysis tests using a thermogravimetric analyzer (TGA) at 60 K/min for different mixed compositions of LDPE, HDPE, PP, and PS were conducted. It was observed that the pyrolysis of the pure polymer samples occurs at different temperature ranges in the following order: PS < PP < LDPE < HDPE. However, compared to pure polymer samples, the co-pyrolysis of all-polymer mixtures was delayed. In addition, the synergistic effect on the co-pyrolysis of polymer blends was reported. The Master plot of the Criado model was used to determine the most suitable reaction mechanism. Then, the Coats–Redfern model was used to efficiently obtain the kinetic parameters (R2 ≥ 97.83%) and the obtained values of the activation energy of different polymer blends were ranging from 104 to 260 kJ/mol. Furthermore, the most controlling reaction mechanisms were in the following orders: First order reaction (F1), Contracting sphere (R3), and then Contracting cylinder (R2).

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Thermal degradation of typical plastics under high heating rate conditions by TG-FTIR: Pyrolysis behaviors and kinetic analysis

Cited by 251 publications

References 42 publications

Pyrolysis dynamics of two medical plastic wastes: Drivers, behaviors, evolved gases, reaction mechanisms, and pathways

Pyrolysis dynamics of two medical plastic wastes: Drivers, behaviors, evolved gases, reaction mechanisms, and pathways

Pyrolysis of Low Density Polyethylene: Kinetic Study Using TGA Data and ANN Prediction

Pyrolysis of Mixed Plastic Waste: I. Kinetic Study

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