Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Numerical Integration of Weight Loss Curves for Kinetic Analysis

Version 1 : Received: 1 March 2021 / Approved: 2 March 2021 / Online: 2 March 2021 (11:57:14 CET)

A peer-reviewed article of this Preprint also exists.

Conesa, J.A. Numerical Integration of Weight Loss Curves for Kinetic Analysis. Thermo 2021, 1, 32-44. Conesa, J.A. Numerical Integration of Weight Loss Curves for Kinetic Analysis. Thermo 2021, 1, 32-44.

Journal reference: Thermo 2021, 1, 3
DOI: 10.3390/thermo1010003

Abstract

Research abounds in the literature on kinetic analyses using thermogravimetric (TG) runs. Many of these studies use approximations of integral or derivative forms of the kinetic law and all of them use programmed temperature, not the actual temperature measured by thermocouples close to the sample. In addition, it is common to conduct a single run in order to perform the calculation. Nevertheless, many authors consider that numerical methods should be used to analyse the kinetics of decomposition. In such cases, the actual temperature is used and, generally, several runs are fitted using the same kinetic parameters, giving robustness to the results. In the present work, a numerical integration procedure was discussed and applied to different examples. We focused on materials presenting a single decomposition curve as well as other materials with more complex processes. Different examples were explored, and the methodology was applied to a number of wastes such as coffee husks, polystyrene and polyethylene.

Keywords

thermogravimetry; wastes; pyrolysis; polyethylene; polystyrene; coffee husks

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