It is promising to convert waste oil and plastics to renewable fuels and chemicals by microwave catalytic co-pyrolysis, enabling pollution reduction and resource recovery. The purpose of this study was to evaluate the effect of catalysts on the product selectivity of microwave-assisted co-pyrolysis of waste cooking oil and low-density polyethylene and optimize the pyrolysis process, including pyrolysis temperature, catalytic temperature, waste cooking oil to low-density polyethylene ratio, and catalyst to feedstocks ratio. The results indicated that catalysts had a great influence on the product distribution, and the yield of BTX (benzene, toluene, and xylenes), which increased in the following order: SAPO-34 < Hβ < HY < HZSM-5. HZSM-5 was more active for the formation of light aromatic hydrocarbons as compared to others, where the concentrations of toluene, benzene and xylenes reached 252.59 mg/mL, 114.7 mg/mL and 132.91 mg/mL, respectively. The optimum pyrolysis temperature, catalytic temperature, waste cooking oil to low-density polyethylene ratio and catalyst to feedstocks ratio could be 550 °C, 450 °C, 1:1 and 1:2, respectively, to maximize the formation of BTX and inhibit the formation of polycyclic aromatic hydrocarbons.
Bibliographical noteFunding Information:
This project was financially supported by the National Natural Science Foundation of China (No. 52166015 ; No. 22166026 ; No. 21766019 ), 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 ).
© 2021 Elsevier B.V.
- Low-density polyethylene
- Waste cooking oil
PubMed: MeSH publication types
- Journal Article