期刊
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
卷 81, 期 1, 页码 100-105出版社
ELSEVIER
DOI: 10.1016/j.jaap.2007.09.004
关键词
pyrolysis; isothermal kinetics; PP; reaction model; Contracting Cylinder model; Avrami-Erofeev model
This paper describes how to estimate the Arrhenius parameters as well as the reaction model of the pyrolysis of polypropylene (PP) from isothermal kinetic results. We introduced a custom-made thermobalance that is able to record weight decrease with time under pure static condition. A best fit of experimental reduced-time-plot (RTP) to theoretical ones led to a conclusion that the pyrolysis reaction model and Arrhenius parameters of PP vary with reaction temperature. The pyrolysis reaction model of PP is accounted for by Contracting Cylinder model at lower-temperature reactions (683-693 K), whereas that of PP by Avrami-Erofeev model at higher-temperature reactions (728-738 K). Medium-temperature reactions (693-728 K) manifest the shift pattern of reaction model from Contracting Cylinder model to Avrarni-Erofeev model. There is a critical temperature (705-720 K) that triggers the explosive generation of volatiles, leading to bubble nucleation and growth, simulating the Avrami-Erofeev model. The nth order model adopted by most previous studies appears to be inappropriate to represent the pyrolysis reaction model of PP. Consequently, the Arrhenius parameters derived from the assumption of nth order model would be improper as well. (c) 2007 Elsevier B.V. All rights reserved.
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