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. Copyright © 2020 Elsevier Ltd. All rights reserved.
CitationChoi, D., Jung, S., Lee, S. S., Lin, K.-Y. A., Park, Y.-K., Kim, H., . . . Kwon, E. E. (2020). Leveraging carbon dioxide to control the H₂/CO ratio in catalytic pyrolysis of fishing net waste. Renewable and Sustainable Energy Reviews. Advance online publication. doi: 10.1016/j.rser.2020.110559
- Catalytic pyrolysis
- Carbon dioxide
- CO₂ utilization