화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.38, No.11, 2235-2246, November, 2021
DOI10.1007/s11814-021-0870-9  Export Citation
Catalytic pyrolysis of linear low-density polyethylene using recycled coal ash: Kinetic study and environmental evaluation
Jianchen Lai1, Yang Meng2, Yuxin Yan3, Edward Lester4, Tao Wu1, 3, and Cheng Heng Pang2, 5, †
  • 1Department of Chemical and Environmental Engineering, University of Nottingham Ningbo China, Ningbo 315100, P. R. China
  • 2New Materials Institute, University of Nottingham Ningbo China, Ningbo 315042, P. R. China
  • 3Key Laboratory for Carbonaceous Wastes Processing and Process Intensification Research of Zhejiang Province, University of Nottingham Ningbo China, Ningbo 315100, P. R. China
  • 4Department of Chemical and Environmental Engineering, University of Nottingham, Nottingham NG7 2RD, UK
  • 5Municipal Key Laboratory of Clean Energy Conversion Technologies, University of Nottingham Ningbo China, Ningbo 315100, China
E-mail:
Catalytic pyrolysis offers a sustainable route to convert plastic wastes into fuel. We investigated the catalytic performance of coal ash (fly and bottom ash) at blending ratio of 5wt%, and 15wt% during pyrolysis of linear lowdensity polyethylene (LLDPE). The influence on activation energy and oil was characterized via thermogravimetric analyzer (TGA) and gas chromatography-mass spectrometry (GC-MS). Results have shown that 15 wt% bottom ash exhibited higher catalytic activity. The activation energy estimated by Coats-Redfern method decreased from 458.7 kJㆍmol-1 to 437.8 kJㆍmol-1, while the alicyclic hydrocarbon yield increased from 5.97% to 32.09%. This implies that CaO, which is abundant in bottom ash, could promote the conversion of LLDPE. Furthermore, a cradle-to-factory gate life cycle assessment was performed to investigate three scenarios (non-catalytic pyrolysis, 15 wt% fly ash, and 15 wt% bottom ash) of LLDPE conversion strategies via a normalization and weighting approach. It was found that LLDPE pyrolysis with 15 wt% bottom ash also showed the lowest normalized score of 2.83, implying the lowest environmental impact. This work has demonstrated that the recycling of coal ash, particularly bottom ash, as catalysts for LLDPE pyrolysis is effective.
Keywords:Waste Management;Catalyst;Catalytic Pyrolysis;Coats-Redfern Method;Normalization and Weighted Scores
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