Conversion of toxic chemicals into flammable gases through the thermolysis of polyurethane foam using CO2

Taewoo Lee, Jung Hun Kim, Yiu Fai Tsang, Wei Hsin Chen, Doyeon Lee, Min Woong Jung, Sungyup Jung, Eilhann E. Kwon

研究成果: Article同行評審

1 引文 斯高帕斯(Scopus)

摘要

Construction waste is considered an environmental problem because its landfilling/incineration treatment methods has noticeably increased the likelihood of releasing microplastics, leachates, air pollutants, and toxic gases into the environment. Nevertheless, an environmentally benign disposal protocol for building plastic waste has yet to be fully implemented. In this study, a cleaner and safer disposal platform for building plastic waste is suggested. Specifically, the thermo-chemical treatment of building insulator waste (BIW) was conducted using CO2 as a key detoxifying agent. The BIW used in this study was composed of polyurethane foam (PUF), according to instrumental analyses. The thermal degradation of the PUF resulted in the dominant production of hazardous chemicals such as 4,4′-methylenedianiline (MDA) and its derivatives. The toxic compounds were transformed/detoxified into syngas (H2/CO) through the catalytic pyrolysis of PUF over nickel-based catalysts. Using CO2 as a detoxifying agent, MDA and its derivatives were further transformed into CO due to the homogeneous chemical reaction between CO2 and toxic compounds. 78.4 wt% of toxic compounds were converted into syngas over the CO2-mediated catalytic pyrolysis. Simultaneous reduction of toxic chemicals and production of value-added compounds propose that CO2 has a great potential to be used as a reaction medium to suppress toxic chemical valorization. Thus, this study experimentally confirmed the technical viability of catalytic pyrolysis under CO2 as a promising disposal platform for BIW, effectively suppressing the fate of toxic compounds.

原文English
文章編號141291
期刊Chemical Engineering Journal
457
DOIs
出版狀態Published - 2023 2月 1

All Science Journal Classification (ASJC) codes

  • 化學 (全部)
  • 環境化學
  • 化學工程 (全部)
  • 工業與製造工程

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