(2019) Bioresource Technology_Orange peel valorization by pyrolysis under the carbon dioxide environment
Kwon D., Oh J.-I., Lam S.S., Moon D.H., Kwon E.E.
(Elsevier Ltd) Bioresource Technology ISSN: 9608524 Vol.285 Issue. Article No.121356 DOI: 10.1016/j.biortech.2019.121356
To valorize biomass waste, pyrolysis of orange peel was mainly investigated as a case study. In an effort to establish a more sustainable thermolytic platform for orange peel, this study particularly employed CO2 as reactive gas medium. Accordingly, this study laid great emphasis on elucidating the mechanistic role of CO2 in pyrolysis of orange peel. The thermo-gravimetric analysis (TGA) confirmed that no occurrence of the heterogeneous reactions between the solid sample and CO2. However, the gaseous effluents from pyrolysis of orange peel experimentally proved that CO2 effectively suppressed dehydrogenation of volatile matters (VMs) evolved from the thermolysis of orange peel by random bond scissions. Moreover, CO2 reacted VMs, thereby resulting in the formation of CO. Note that the formation of CO was being initiated at temperatures ≥550 °C. The two identified roles of CO2 led to the compositional modification of pyrolytic oil by means of lowering aromaticity. © 2019 Elsevier Ltd
This work was supported by a grant from National Research Foundation of Korea (NRF-2017R1D1A1B03028176).
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