Calorimetric studies of crystallization for multi-component glasses of Se–Te–Sn–Ag (STSA) system using model-free and model-fitting non-isothermal methods

Srivastava, Ankita; Chandel, N.; Mehta, N.

doi:10.1007/s10973-016-6019-0

Cited by 11 publications

(2 citation statements)

References 38 publications

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“…The model-free method does not have any previous assumptions about the reaction model and allows the kinetic parameters to be calculated as a function of the conversion degree. Different model-free methods, such as the Friedman, the FWO, the KAS and the Tang method (Hardi et al, 2018; Srivastava et al, 2017) have been proposed and used for the kinetic study of solid materials. In this work, the model-fitting CR method and the Friedman, FWO, KAS and Starink model-free methods were employed.…”

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

114

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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

114

View full text Add to dashboard Cite

show abstract

“…For the model-free method, there are no previous assumptions about the reaction model and allows the kinetic parameters to be calculated as a function of α (degree of conversion). Different model-free methods, such as Friedman, FWO, Kissinger–Akahira–Sunose, Starink and Tang methods (Hardi et al, 2018; Srivastava et al, 2017), have been proposed for the kinetic study.…”

Section: Methodsmentioning

confidence: 99%

Comparative study on the pyrolysis kinetics of polyurethane foam from waste refrigerators

Yao

et al. 2019

Waste Manag Res

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Thermal treatment offers advantages of significant volume reduction and energy recovery for the polyurethane foam from waste refrigerators. In this work, the pyrolysis kinetics of polyurethane foam was investigated using the model-fitting, model-free and distributed activation energy model methods. The thermogravimetric analysis indicated that the polyurethane foam decomposition could be divided into three stages with temperatures of 38°C–400°C, 400°C–550°C and 550°C–1000°C. Peak temperatures for the major decomposition stage (<400°C) were determined as 324°C, 342°C and 344°C for heating rates of 5, 15 and 25 K min-1, respectively. The activation energy ( Eα) from the Friedman, Flynn–Wall–Ozawa and Tang methods increased with degree of conversion ( α) in the range of 0.05 to 0.5. The coefficients from the Flynn–Wall–Ozawa method were larger and the resulted Eα values fell into the range of 163.980–328.190 kJ mol-1 with an average of 206.099 kJ mol-1. For the Coats–Redfern method, the diffusion models offered higher coefficients, but the E values were smaller than that from the Flynn–Wall–Ozawa method. The Eα values derived from the distributed activation energy model method were determined as 163.536–334.231 kJ mol-1, with an average of 206.799 kJ mol-1. The peak of activation energy distribution curve was located at 205.929 kJ mol-1, consistent with the thermogravimetric results. The Flynn–Wall–Ozawa and distributed activation energy model methods were more reliable for describing the polyurethane foam pyrolysis process.

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Thermal Kinetics Through Differential Scanning Calorimetry in Chalcogenide Glassy Semiconductors

Srivastava,

Dohare,

Chourasia

et al. 2024

Engineering Materials

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Calorimetric studies of crystallization for multi-component glasses of Se–Te–Sn–Ag (STSA) system using model-free and model-fitting non-isothermal methods

Cited by 11 publications

References 38 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

Comparative study on the pyrolysis kinetics of polyurethane foam from waste refrigerators

Thermal Kinetics Through Differential Scanning Calorimetry in Chalcogenide Glassy Semiconductors

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