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Catalytic pyrolytic platform for scrap tires using CO2 and steel slag

Authors
Cho, Seong-HeonOh, Jeong-IkJung, SungyupPark, Young-KwonTsang, Yiu FaiOk, Yong SikKwon, Eilhann E.
Issue Date
1-2월-2020
Publisher
ELSEVIER SCI LTD
Keywords
Scrap tire; Waste-to-energy; Catalysis; Pyrolysis; Carbon dioxide; Steel slag
Citation
APPLIED ENERGY, v.259
Indexed
SCIE
SCOPUS
Journal Title
APPLIED ENERGY
Volume
259
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/57726
DOI
10.1016/j.apenergy.2019.114164
ISSN
0306-2619
Abstract
This study specifically examined CO2-cofeeding pyrolysis of scrap tire (ST) to enhance H-2 generation. Thus, volatile pyrolysates (syngas and pyrolytic oil) from the thermolysis of ST in N-2 and CO2 were compared to elucidate the mechanistic roles of CO2. To this end, laboratory scale of pyrolysis of ST from N-2 and CO2 was conducted in this study. The gaseous effluents from a pyrolyzer showed that enhanced CO evolution only from CO2-cofeeding pyrolysis of ST. Moreover, a substantial decrease in the formation of benzene derivatives (BDs) including polycyclic aromatic hydrocarbons (PAHs) was discovered from CO2-cofeeding pyrolysis of ST. Those findings offered that CO2 could improve pyrolysis of ST by modifying the pyrogenic products, and those enhanced pyrolysis behaviors were ascribed to the homogeneous interaction between CO2 and pyrolysates from the pyrolysis of ST (more CO generation). To advance the identified roles of CO2, catalytic pyrolysis of ST in CO2 was carried out using steel slag (SS) as a catalyst. In the presence of SS, the effectiveness of CO2 on pyrolysis of ST was dramatically enhanced (similar to 400% enhancement at 400 degrees C). Therefore, this study experimentally justified that the utilization of SS could alleviate the environmental burdens by adopting CO2 in pyrolysis of ST. Also, the CO enhancement by CO2 likely leads to the H-2 enhancement when the water-gas-shift (WGS) reaction was also conducted. All experimental findings from this study suggested that the use of CO2 in pyrolysis of ST could be a breakthrough to enhance H-2 formation.
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