Picheau, Emmanuel and Hof, Ferdinand and Derré, Alain and Daffos, Barbara and Pénicaud, Alain
Thermal Oxidation of Carbonaceous Nanomaterials Revisited: Evidence of Mechanism Changes.
(2019)
Angewandte Chemie International Edition, 131 (42). 1-6. ISSN 1433-7851
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(Document in English)
PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 1MB |
Official URL: https://doi.org/10.1002/anie.201906026
Abstract
Kinetic data, for example, activation energy and reaction order, are crucial for the understanding of chemical reactions and processes. Here, we describe a novel method for obtaining kinetic data based on thermogravimetric measurements (TGA) that exploits in each measurement multiple successive isothermal steps (SIS). We applied this method to the notoriously challenging carbon combustion process for vastly different carbons for oxygen molar fractions between 1.4 % and 90 %. Our obtained apparent EA values are within the wide range of results in the literature and vary in a systematic way with the oxygen partial pressure. The improved accuracy and large amount of obtainable data allowed us to show that the majority of experimentally obtained apparent data for apparent EA are neither in a kinetic regime nor in a diffusion‐controlled one but rather in a transition regime.
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