TY - JOUR
T1 - Catalytic fast pyrolysis of low density polyethylene into naphtha with high selectivity by dual-catalyst tandem catalysis
AU - Dai, Leilei
AU - Zhou, Nan
AU - Li, Hui
AU - Wang, Yunpu
AU - Liu, Yuhuan
AU - Cobb, Kirk
AU - Cheng, Yanling
AU - Lei, Hanwu
AU - Chen, Paul
AU - Ruan, Roger
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/6/1
Y1 - 2021/6/1
N2 - 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 C5-C23 olefins that are the important precursors to form aromatics via Diels-Alder, aromatization, and polymerization reactions in the pores of ZSM-5 catalyst. Experimental results also show that the selectivity of monoaromatics and C5-C12 alkanes/olefins can be up to 100% over Al2O3 followed by ZSM-5 relay catalysis at the temperature of 550 °C, the catalyst to plastic ratio of 4:1, and Al2O3 to ZSM-5 ratio of 1:1. The product (monoaromatics and C5-C12 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.
AB - 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 C5-C23 olefins that are the important precursors to form aromatics via Diels-Alder, aromatization, and polymerization reactions in the pores of ZSM-5 catalyst. Experimental results also show that the selectivity of monoaromatics and C5-C12 alkanes/olefins can be up to 100% over Al2O3 followed by ZSM-5 relay catalysis at the temperature of 550 °C, the catalyst to plastic ratio of 4:1, and Al2O3 to ZSM-5 ratio of 1:1. The product (monoaromatics and C5-C12 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.
KW - AlO
KW - Catalytic pyrolysis
KW - Naphtha
KW - Polyethylene
KW - ZSM-5 zeolite
UR - http://www.scopus.com/inward/record.url?scp=85100391959&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85100391959&partnerID=8YFLogxK
U2 - 10.1016/j.scitotenv.2021.144995
DO - 10.1016/j.scitotenv.2021.144995
M3 - Article
C2 - 33545487
AN - SCOPUS:85100391959
SN - 0048-9697
VL - 771
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 144995
ER -
