Pyrolytic kinetics of polystyrene particle in nitrogen atmosphere : particle size effects and application of distributed activation energy method

Jiang, Lin (author), Yang, Xin-Rui (author), Gao, Xu (author), Xu, Qiang (author), Das, Oisik (author), Sun, Jin-Hua (author), Kitek Kuzman, Manja (author)

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) = nα$^{0.39n − 1.15}$(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.

• Language: English
• Keywords: particle size, model free, model fitting, Avrami-Eroféev, DAEM
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2020
• Number of pages: 18 str.
• Numbering: Vol. 12, iss. 2, art. 421
• PID: 20.500.12556/RUL-133260
• UDC: 62
• ISSN on article: 2073-4360
• DOI: 10.3390/polym12020421
• COBISS.SI-ID: 3172745
• Publication date in RUL: 18.11.2021

Record is a part of a journal

• Title: Polymers
• Shortened title: Polymers
• Publisher: MDPI
• ISSN: 2073-4360
• COBISS.SI-ID: 517951257

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 12.02.2020