Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 827, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.154186
Keywords
Waste shell; CaO; HZSM-5; Catalytic pyrolysis; Biofuel; Aromatics
Categories
Funding
- National Natural Science Foundation of China [21766019]
- Open Research Fund Program of State Environmental Protection Key Laboratory of Food Chain Pollution Control [20202ZDB01012]
- Centrally Guided Local Science Technology Special Project [20204BCJ23011]
- Major Discipline Academic and Technical Leaders Training Program of Jiangxi Province [20212ACB215007]
- Jiangxi Provincial Natural Science Foundation [FC2021YB06]
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In this study, CaO was prepared from waste eggshell, preserved egg shell, clam shell, and crab shell to catalyze pyrolysis of waste cooking oil. The results showed that eggshell and clam shell had higher CaO content and better pore properties. The effects of CaO type and catalytic mode on pyrolysis were studied, and different CaO types and catalytic modes produced different amounts of aromatics.
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.
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