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Title: In situ catalytic reforming of plastic pyrolysis vapors using MSW incineration ashes
Authors: Ahamed, Ashiq
Liang, Lili
Chan, Wei Ping
Tan, Preston Choon Kiat
Yip, Nicklaus Tze Xuan
Bobacka, Johan
Veksha, Andrei
Yin, Ke
Lisak, Grzegorz
Keywords: Engineering::Environmental engineering::Waste management
Engineering::Environmental engineering::Hazardous substances
Issue Date: 2021
Source: Ahamed, A., Liang, L., Chan, W. P., Tan, P. C. K., Yip, N. T. X., Bobacka, J., ... Lisak, G. (2021). In situ catalytic reforming of plastic pyrolysis vapors using MSW incineration ashes. Environmental Pollution, 276, 116681-. doi:10.1016/j.envpol.2021.116681
Journal: Environmental Pollution 
Abstract: The valorization of municipal solid waste incineration bottom and fly ashes (IBA and IFA) as catalysts for thermochemical plastic treatment was investigated. As-received, calcined, and Ni-loaded ashes prepared via hydrothermal synthesis were used as low-cost waste-derived catalysts for in-line upgrading of volatile products from plastic pyrolysis. It was found that both IBA and air pollution control IFA (APC) promote selective production of BTEX compounds (i.e., benzene, toluene, ethylbenzene, and xylenes) without significantly affecting the formation of other gaseous and liquid species. There was insignificant change in the product distribution when electrostatic precipitator IFA (ESP) was used, probably due to the lack of active catalytic species. Calcined APC (C-APC) demonstrated further improvement in the BTEX yield that suggested the potential to enhance the catalytic properties of ashes through pre-treatment. By comparing with the leaching limit values stated in the European Council Decision 2003/33/EC for the acceptance of hazardous waste at landfills, all the ashes applied remained in the same category after the calcination and pyrolysis processes, except the leaching of Cl- from the ESP, which was around the borderline. Therefore, the use of ashes in catalytic reforming application do not significantly deteriorate their metal leaching behavior. Considering its high catalytic activity towards BTEX formation, C-APC was loaded with Ni at 15 and 30 wt%. The Ni-loading favored an increase in overall oil yield, while reducing the gas yield when compared to the benchmark Ni loaded ZSM catalyst. However, Ni addition also caused the formation of more heavier hydrocarbons (C20-C35) that would require post-treatment to recover favorable products like BTEX.
ISSN: 0269-7491
DOI: 10.1016/j.envpol.2021.116681
Rights: © 2021 Elsevier Ltd. All rights reserved. This paper was published in Environmental Pollution and is made available with permission of Elsevier Ltd.
Fulltext Permission: embargo_20230508
Fulltext Availability: With Fulltext
Appears in Collections:NEWRI Journal Articles

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