Catalytic fast pyrolysis of low density polyethylene into naphtha with high selectivity by dual-catalyst tandem catalysis

被引:48
作者
Dai, Leilei [1 ,2 ]
Zhou, Nan [1 ,2 ]
Li, Hui [1 ,2 ]
Wang, Yunpu [3 ]
Liu, Yuhuan [3 ]
Cobb, Kirk [1 ,2 ]
Cheng, Yanling [1 ,2 ,4 ]
Lei, Hanwu [5 ]
Chen, Paul [1 ,2 ]
Ruan, Roger [1 ,2 ]
机构
[1] Univ Minnesota, Ctr Biorefining, 1390 Eckles Ave, St Paul, MN 55108 USA
[2] Univ Minnesota, Dept Bioprod & Biosyst Engn, 1390 Eckles Ave, St Paul, MN 55108 USA
[3] Nanchang Univ, Engn Res Ctr Biomass Convers, Minist Educ, Nanchang 330047, Jiangxi, Peoples R China
[4] Beijing Union Univ, Biochem Engn Coll, 18,Fatouxili 3 Area, Beijing 100023, Peoples R China
[5] Washington State Univ, Dept Biol Syst Engn, Richland, WA 99354 USA
基金
中国国家自然科学基金;
关键词
Polyethylene; Catalytic pyrolysis; Naphtha; ZSM-5; zeolite; Al2O3;
D O I
10.1016/j.scitotenv.2021.144995
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In this work, catalytic fast pyrolysis of low density polyethylene (LDPE) into highly valuable naphtha by the relay catalysis (Al2O3 followed by ZSM-5 zeolite) was conducted. Effects of different catalysts, pyrolysis temperatures, catalyst to plastic ratio, and Al2O3 to ZSM-5 ratio, on product distribution and selectivity were studied. Al2O3 shows an excellent performance for catalytic reforming of LDPE pyrolysis vapors, mainly producing C-5-C-23 olefins that are the important precursors to formaromatics via Diels-Alder, aromatization, and polymerization reactions in the pores of ZSM-5 catalyst. Experimental results also show that the selectivity of monoaromatics and C-5-C-12 alkanes/olefins can be up to 100% over Al2O3 followed by ZSM-5 relay catalysis at the temperature of 550 degrees C, the catalyst to plastic ratio of 4:1, and Al2O3 to ZSM-5 ratio of 1:1. The product (monoaromatics and C-5-C-12 alkanes/olefins), naphtha, could be a renewable feedstock for new plastic production in the petroleum industry so that this finding might provide a new insight for a circular economy. (C) 2021 Elsevier B.V. All rights reserved.
引用
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页数:9
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