期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 461, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2023.132672
关键词
Polyethylene; Aromatics; Pressurized catalytic pyrolysis; Pyrolysis activity; Catalysis stability
A pulse pressurized catalytic pyrolysis process was developed to convert waste plastic into high-value compounds. The results showed that pressurization improved the pyrolysis activity and catalysis stability.
To address the challenging issues of waste plastic pollution and petroleum shortage, we report herein a pulse pressurized catalytic pyrolysis process where polyethylene is continuously converted into aromatics using HZSM-5 catalyst incorporated with hydrated SiO2. Pressurization improves the activity of single-pulse pyrolysis of polyethylene by 14.42%. In contrast to the linear decrease of BTEXS relative yield with a K value of -0.23 under non-pressurized conditions, pressurization results in a notable stability in the latter stage, characterized by a K value of only -0.063. Comprehensive catalyst characterization demonstrates that pressurization promotes the release of water from hydrated SiO2, enabling HZSM-5 to effectively undergo dealumination and obtain suitable acidity and pore structure, and ultimately enhancing the resistance to carbon deposition. In summary, pres-surization improves both pyrolysis activity and catalysis stability, offering a promising strategy for the high-value utilization of waste plastics.
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