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Pyrolytic Kinetics of Polystyrene Particle in Nitrogen Atmosphere : Particle Size Effects and Application of Distributed Activation Energy Method
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- Jiang, Lin (author)
- School of Mechanical Engineering, Nanjing University of Science and Technology, China
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- Yang, Xin-Rui (author)
- School of Mechanical Engineering, Nanjing University of Science and Technology, China
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- Gao, Xu (author)
- School of Mechanical Engineering, Nanjing University of Science and Technology, China
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- (creator_code:org_t)
- 2020-02-12
- 2020
- English.
- In: Polymers. - : MDPI. - 2073-4360. ; 12:2
- Journal article (peer-reviewed)
Abstract
Subject headings
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- This work was motivated by a study of particle size effects on pyrolysis kinetics and models of polystyrene particle. Micro-size polystyrene particles with four different diameters, 5, 10, 15, and 50 µm, were selected as experimental materials. Activation energies were obtained by isoconversional methods, and pyrolysis model of each particle size and heating rate was examined through different reaction models by the Coats–Redfern method. To identify the controlling model, the Avrami–Eroféev model was identified as the controlling pyrolysis model for polystyrene pyrolysis. Accommodation function effect was employed to modify the Avrami–Eroféev model. The model was then modified to f(α) = nα0.39n − 1.15(1 − α)[−ln(1 − α)]1 − 1/n, by which the polystyrene pyrolysis with different particle sizes can be well explained. It was found that the reaction model cannot be influenced by particle geometric dimension. The reaction rate can be changed because the specific surface area will decrease with particle diameter. To separate each step reaction and identify their distributions to kinetics, distributed activation energy method was introduced to calculate the weight factor and kinetic triplets. Results showed that particle size has big impacts on both first and second step reactions. Smaller size particle can accelerate the process of pyrolysis reaction. Finally, sensitivity analysis was brought to check the sensitivity and weight of each parameter in the model.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Industriell bioteknik -- Biomaterial (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Industrial Biotechnology -- Bio Materials (hsv//eng)
Keyword
- particle size
- model free
- model fitting
- avrami–eroféev
- DAEM
- Trä och bionanokompositer
- Wood and Bionanocomposites
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- ref (subject category)
- art (subject category)
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- Jiang, Lin
- Yang, Xin-Rui
- Gao, Xu
- Xu, Qiang
- Das, Oisik
- Sun, Jin-Hua
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- Kuzman, Manja Ki ...
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- About the subject
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- ENGINEERING AND TECHNOLOGY
- ENGINEERING AND ...
- and Industrial Biote ...
- and Bio Materials
- Articles in the publication
- Polymers
- By the university
- Luleå University of Technology
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