Synthesis of CaO from waste shells for microwave-assisted catalytic pyrolysis of waste cooking oil to produce aromatic-rich bio-oil

Shumei Zhang, Jianyun Xiong, Jiaxin Lu, Nan Zhou, Hui Li, Xian Cui, Qi Zhang, Yuhuan Liu, Roger Ruan, Yunpu Wang

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11 Scopus citations


Energy shortage and environmental pollution have attracted long-term attention. In this study, CaO were prepared from waste eggshell (EGC), preserved egg shell (PEC), clam shell (CLC) and crab shell (CRC), which were then compared with commercial CaO (CMC) to catalyze microwave-assisted pyrolysis of waste cooking oil (WCO) for enrichment of aromatics in bio-oil. The characterization results indicated that EGC and CLC contained 95.54% and 95.61% CaO respectively, which were higher than that of CMC (95.11%), and the pore properties of EGC were the best. In addition, the effects of CaO type and catalytic mode on pyrolysis were studied. In CaO catalytic pyrolysis, CMC and CLC in-situ catalysis produced more aromatics than ex-situ catalysis, and PEC and CRC were more conducive to aromatics formation in ex-situ condition. EGC was conducive to produce benzene, toluene and xylene (BTX) both in in-situ (19.04%) and ex-situ (20.76%) catalytic pyrolysis. In CaO/HZSM-5 catalysis, the optimal dual catalytic mode for generating monocyclic aromatic hydrocarbons (MAHs) was Mode A (CaO separated from HZSM-5 for ex-situ catalysis), and EGC/HZSM-5 performed well in benzene, toluene and xylene (BTX) production.

Original languageEnglish (US)
Article number154186
JournalScience of the Total Environment
StatePublished - Jun 25 2022

Bibliographical note

Funding Information:
This project was financially supported by the National Natural Science Foundation of China (No. 21766019 ), the Open Research Fund Program of State Environmental Protection Key Laboratory of Food Chain Pollution Control ( FC2021YB06 ), The Centrally Guided Local Science Technology Special Project ( 20202ZDB01012 ), the Major Discipline Academic and Technical Leaders Training Program of Jiangxi Province ( 20204BCJ23011 ), The Jiangxi Provincial Natural Science Foundation ( 20212ACB215007 ).

Publisher Copyright:
© 2022 Elsevier B.V.


  • Aromatics
  • Biofuel
  • CaO
  • Catalytic pyrolysis
  • HZSM-5
  • Waste shell

PubMed: MeSH publication types

  • Journal Article


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