Leveraging carbon dioxide to control the H2/CO ratio in catalytic pyrolysis of fishing net waste

Dongho Choi, Sungyup Jung, Sang Soo Lee, Kun-Yi Andrew Lin, Young-Kwon Park, Hana Kim, Yiu Fai Tsang and Eilhann E. Kwon

Renewable and Sustainable Energy Reviews, 2021, vol. 138, issue C

Abstract: The global presence of plastic debris has become an indisputable environmental issue. While it is useful to recycle used plastic materials, contaminated plastics require a series of pretreatments prior to the process. Here, we offer a viable thermochemical conversion (pyrolysis) platform to directly valorize fishing net waste (FNW). Prior to the pyrolysis of FNW that was collected at a Korean seaport, its chemical composition (polyethylene) was examined using thermogravimetric analysis, ultimate analysis, and Fourier-transform infrared spectroscopy measurements. Pyrolysis of FNW was conducted to produce value-added syngas and C1-2 hydrocarbons (HCs) in both CO2 and N2 environments with a variety of pyrolysis setups. The pyrolysis temperature significantly contributed to the thermal cracking of long-chain liquid HCs into H2 and C1-2 HCs under the N2 and CO2 conditions. In the presence of cobalt-based catalysts, an additional improvement of the reaction kinetics for producing H2 and C1-2 HCs was shown in the N2 environment. However, the synergistic effectiveness of Co-based catalysts and CO2 resulted in CO formation, because CO2 provided additional C and O sources over the Co-based catalysts. Thus, it allowed control of the H2/CO ratio in the CO2 and N2 atmospheres. The compositional matrix of the liquid HCs after pyrolysis also confirmed that CO2 controlled their aromaticity. Thus, the CO2-cofeeding pyrolysis of FNW can be considered a viable platform for the direct treatment of plastic wastes by harvesting energy as a form of syngas.

Keywords: Waste-to-energy; Catalytic pyrolysis; Plastic; Carbon dioxide; CO2 utilization; CO2-to-fuel (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (2)

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DOI: 10.1016/j.rser.2020.110559

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