Thermicity of the Decomposition of Oxygen Functional Groups on Cellulose-Derived Chars
Christin Pflieger, Till Eckhard, Gunnar Alexander Schmitz, Vanessa Angenent, Maximilian Göckeler, Osvalda Senneca, Rochus Schmid, Francesca Cerciello, Martin Muhler
Abstract
. The most strongly pronounced thermic effects were detected for the release of CO, comprising highly exothermic effects due to the decomposition of condensed acids and carbonyls/quinones as well as endothermic effects attributed to anhydrides and phenols/ethers. Notably, anhydrides can be formed during the oxidative treatment as well as during heating by condensation of adjacent carboxylic acids. In the latter case, the two-step decomposition is overall highly exothermic, indicating the associated occurrence of pronounced carbon matrix rearrangements. DFT investigations suggest that these rearrangements not only affect the immediate OFG proximity but also involve several carbon sheets.