Polyethylene upcycling to aromatics by pulse pressurized catalytic pyrolysis

被引:9
作者
Ke, Linyao [1 ]
Wu, Qiuhao [1 ]
Zhou, Nan [2 ]
Li, Hui [3 ]
Zhang, Qi [1 ]
Cui, Xian [1 ]
Fan, Liangliang [1 ]
Liu, Yuhuan [1 ]
Cobb, Kirk [4 ,5 ]
Ruan, Roger [4 ,5 ]
Wang, Yunpu [1 ]
机构
[1] Nanchang Univ, Engn Res Ctr Biomass Convers, State Key Lab Food Sci & Resources, Minist Educ, Nanchang 330047, Peoples R China
[2] Zhejiang Univ Technol, Inst Thermal & Power Engn, Liuhe Rd 288, Hangzhou 310023, Peoples R China
[3] Shandong Jianzhu Univ, Sch Thermal Engn, Jinan 250101, Peoples R China
[4] Univ Minnesota, Ctr Biorefining, 1390 Eckles Ave, St Paul, MN 55112 USA
[5] Univ Minnesota, Dept Bioprod & Biosyst Engn, 1390 Eckles Ave, St Paul, MN 55112 USA
基金
中国国家自然科学基金;
关键词
Polyethylene; Aromatics; Pressurized catalytic pyrolysis; Pyrolysis activity; Catalysis stability; PLASTIC WASTE; METHANOL; ZEOLITES; ZSM-5; H-ZSM-5; STATE; OIL;
D O I
10.1016/j.jhazmat.2023.132672
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
引用
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页数:13
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