NDLI: Influence of heating rate on kinetic quantities of solid phase thermal decomposition

Content Provider	Springer Nature Link
Author	Bigda, R. Miawski, A.
Copyright Year	2006
Abstract	Thermogravimetric analyses of thermal decomposition (pyrolysis, thermal dissociation and combustion) of 9 different samples were carried out in dynamic conditions at different heating rates. The kinetic parameters (E, A and k$_{m}$) of thermal decomposition were determined and interrelations between the parameters and heating rate q were analyzed. There were also relations between Arrhenius and Eyring equations analyzed for thermal decomposition of solid phase. It was concluded that Eyring theory is an element, which interconnects used thermokinetic equations containing Arrhenius law and suggests considering kinetic quantities in way relative to 3 kinetic constants (E, A and k$_{m}$). Analysis of quantities other than km (i.e. E, A, Δ$^{+}$H, Δ$^{+}$S) in relation to heating rate is an incomplete method and does not lead to unambiguous conclusions. It was ascertained that in ideal case, assuming constant values of kinetic parameters (E and A) towards heating rate and satisfying both Kissinger equations, reaction rate constant k$_{m}$ should take on values intermediate between constants (k$_{m}$)$_{1}$ and (k$_{m}$)$_{2}$ determined from these equations. Whereas behavior of parameters E and A towards q were not subjected to any rule, then plotting relation k$_{m}$ vs. q in the background of (k$_{m}$)$_{1}$ and (k$_{m}$)$_{2}$ made possible classification of differences between thermal decomposition processes taking place in oxidizing and oxygen-free atmosphere.
Starting Page	453
Ending Page	465
Page Count	13
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	84
Issue Number	2
e-ISSN	15728943
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-04-24
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arrhenius law Eyring theory heating rate isokinetic effect thermogravimetry thermokinetic analysis Inorganic Chemistry Physical Chemistry Polymer Sciences Measurement Science, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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