A comparative applicability study of model-fitting and model-free kinetic analysis approaches to non-isothermal pyrolysis of coal and agricultural residues

Ashraf, Asma; Sattar, H.; Munir, Shahid

doi:10.1016/j.fuel.2018.11.149

Cited by 69 publications

(18 citation statements)

References 41 publications

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“…TG analysis is the most widely used technique for studying the thermal decomposition of solids (Ashraf et al, 2019; Bach and Chen, 2017). During the test, approximately 2 mg of the plastic sample was placed on the ceramic crucibles and heated from 20°C to 1000°C under a helium gas flow of 50 mL/min.…”

Section: Methodsmentioning

confidence: 99%

Kinetic studies on the pyrolysis of plastic waste using a combination of model-fitting and model-free methods

Yao

et al. 2020

Waste Manag Res

117

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In this work, the pyrolysis behavior of plastic waste—TV plastic shell—was investigated, based on thermogravimetric analysis and using a combination of model-fitting and model-free methods. The possible reaction mechanism and kinetic compensation effects were also examined. Thermogravimetric analysis indicated that the decomposition of plastic waste in a helium atmosphere can be divided into three stages: the minor loss stage (20–300°C), the major loss stage (300–500°C) and the stable loss stage (500–1000°C). The corresponding weight loss at three different heating rates of 15, 25 and 35 K/min were determined to be 2.80–3.02%, 94.45–95.11% and 0.04–0.16%, respectively. The activation energy ( Ea) and correlation coefficient ( R2) profiles revealed that the kinetic parameters calculated using the Friedman and Kissinger–Akahira–Sunose method displayed a similar trend. The values from the Flynn–Wall–Ozawa and Starink methods were comparable, although the former gave higher R2 values. The Eα values gradually decreased from 269.75 kJ/mol to 184.18 kJ/mol as the degree of conversion ( α) increased from 0.1 to 0.8. Beyond this range, the Eα slightly increased to 211.31 kJ/mol. The model-fitting method of Coats–Redfern was used to predict the possible reaction mechanism, for which the first-order model resulted in higher R2 values than and comparable Eα values to those obtained from the Flynn–Wall–Ozawa method. The pre-exponential factors (ln A) were calculated based on the F1 reaction model and the Flynn–Wall–Ozawa method, and fell in the range 59.34–48.05. The study of the kinetic compensation effect confirmed that a compensation effect existed between Ea and ln A during the plastic waste pyrolysis.

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Section: Methodsmentioning

confidence: 99%

Kinetic studies on the pyrolysis of plastic waste using a combination of model-fitting and model-free methods

Yao

et al. 2020

Waste Manag Res

117

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“…There are two major methods, model-fitting and model-free, that have been recently developed for the study of solids decomposition (Ali et al, 2019; Ashraf et al, 2019; Du et al, 2019; Ma et al, 2014). For the model-fitting method, different reaction models have been proposed and kinetic parameters can be determined based on them.…”

Section: Methodsmentioning

confidence: 99%

Kinetic study on the slow pyrolysis of nonmetal fraction of waste printed circuit boards (NMF-WPCBs)

Yao

Xiong

et al. 2020

Waste Manag Res

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In this study, the pyrolysis behaviour of nonmetal fraction of waste printed circuit boards (NMF-WPCBs) was studied based on five model-free methods and distributed activation energy model (DAEM). The possible decomposition mechanism was further probed using the Criado method. Thermogravimetric analysis indicated that the NMF-WPCBs pyrolysis process could be divided into three stages with temperatures of 37–330°C, 330–380°C and 380–1000°C. The mass loss at different heating rate was determined as 26.85–29.98%, 13.47–24.21% and 20.43–23.36% for these stages, respectively. The activation energy ( Eα) from various model-free methods first increased with degree of conversion ( α) increasing from 0.05 to 0.275, and then decreased beyond this range. The coefficient ( R) from the Flynn–Wall–Ozawa (FWO) method was higher, and the resulting Eα fell into the range of 214.947–565.660 kJ mol−1. For the DAEM method, the average Eα value was determined as 337.044 kJ mol−1, comparable with 329.664 kJ mol−1 from the FWO method. The thermal decomposition kinetics of NMF-WPCBs could be better described by the second-order reaction.

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“…Miscanthus giganteus and Sida hermaphrodita, as perennial crops, do not require intensive workload and provide continuous ground cover for 15-20 years [8,9]. Due to simple cultivation and harvesting, Miscanthus giganteus, Sida hermaphrodita, and Sorghum Moench have high biomass yields on the level of [21][22][23][24][25][20][21][22][23][24][25], and 15-18 t/ha, respectively [9]. They can be effectively cultivated under Polish climatic conditions.…”

Section: Introductionmentioning

confidence: 99%

“…For the analysis of biomass-pyrolysis kinetics, we can use three kinds of kinetic method: model fitting, isoconversional, and nonlinear regression [21]. A model giving a satisfactory fit is selected as the appropriate model for the determination of the kinetic parameters [11,22]. In the case of model fitting, pyrolysis is described by a one-step reaction using TG data.…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetric Kinetics of Selected Energy Crops Pyrolysis

2020

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The main purpose of this paper was to compare the pyrolysis kinetics of three types of energy crops: Miscanthus giganteus, Sida hermaphrodita, and Sorghum Moench. Studies were conducted in thermobalance. Feedstock samples were heated up from ambient temperature to 600 °C under an inert argon atmosphere. Three heating rates of β = 5, 10, and 20 °C/min were applied. Reactions occurring in the given temperature ranges were grouped together into so-called lumps identified by the deconvolution of derivative thermogravimetry (DTG) curves that corresponded to biomass compositions (hemicellulose, cellulose, and lignin). For the estimation of the activation energy and pre-exponential factor, the Friedman and Ozawa–Flynn–Wall methods were used. The final kinetic parameters were determined by nonlinear regression assuming that thermal decomposition proceeded via three parallel independent reactions of the nth order. The activation energy of hemicellulose, cellulose and lignin was determined to be in the range of 92.9–97.7, 190.1–192.5, and 170–175.2 kJ/mol, respectively. The reaction order was in the range of 3.35–3.99 for hemicellulose, 1.38–1.93 for cellulose, and 3.97–3.99 for lignin. The obtained results allow us to estimate the pyrolytic potential of energy crops selected for this study, and can be used in designing efficient pyrolizers for these materials.

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A comparative applicability study of model-fitting and model-free kinetic analysis approaches to non-isothermal pyrolysis of coal and agricultural residues

Cited by 69 publications

References 41 publications

Kinetic studies on the pyrolysis of plastic waste using a combination of model-fitting and model-free methods

Kinetic studies on the pyrolysis of plastic waste using a combination of model-fitting and model-free methods

Kinetic study on the slow pyrolysis of nonmetal fraction of waste printed circuit boards (NMF-WPCBs)

Thermogravimetric Kinetics of Selected Energy Crops Pyrolysis

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