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Enhancement of syngas for H-2 production via catalytic pyrolysis of orange peel using CO2 and bauxite residue

Authors
Yoon, KwangsukLee, Sang SooOk, Yong SikKwon, Eilhann E.Song, Hocheol
Issue Date
15-11월-2019
Publisher
ELSEVIER SCI LTD
Keywords
Agricultural waste; Pyrolysis; Waste-to-energy; H-2 production; Bauxite residue; Carbon dioxide
Citation
APPLIED ENERGY, v.254
Indexed
SCIE
SCOPUS
Journal Title
APPLIED ENERGY
Volume
254
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/61582
DOI
10.1016/j.apenergy.2019.113803
ISSN
0306-2619
Abstract
This study investigated co-pyrolysis of orange peel and bauxite residue, focusing on enhancing syngas generation through CO2-cofeeding. The results revealed that adopting CO2 as a reactive gas medium led to an increase of CO generation through the gas phase reactions of CO2 and pyrolysates. Such phenomena were further enhanced by the presence of bauxite residue, yielding 75% enhancement of CO generation, which is likely due to the catalytic role of metallic components in the bauxite residue. These observations offered useful implications in H-2 production. First, CO generated from the process could be converted into H-2 by adopting an additional chemical unit operation (i.e., water-gas-shift reaction). Second, considering that the final products of the water-gas-shift reaction are H-2 and CO2, the CO2 from water-gas-shift reaction could be reutilized by looping CO2 into the pyrolysis process to further expedite H-2 production. Apart from H-2 production perspective, the more carbon conversion into CO is practically beneficial for reducing coke formation. Hence, the overall results of this study suggest that careful selection of biomass wastes and proper utilization of industrial waste materials could provide a viable platform for developing more efficient energy-harvesting process in thermolysis technology.
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