Enhancing hydrocarbon production via ex-situ catalytic co-pyrolysis of biomass and high-density polyethylene: Study of synergistic effect and aromatics selectivity

被引：37

作者：

He, Tengfei ^{[1
]}

Zhong, Siying ^{[1
]}

Liu, Chenhao ^{[1
]}

Shujaa, Awsan ^{[1
]}

Zhang, Bo ^{[1
]}

机构：

[1] Southeast Univ, Minist Educ, Key Lab Energy Thermal Convers & Control, Nanjing 210096, Jiangsu, Peoples R China

来源：

WASTE MANAGEMENT | 2021年 / 128卷

关键词：

Ex-situ catalytic fast co-pyrolysis; Py-GC; MS; Positive synergistic effect; Carbon selectivity; BIO-OIL;

D O I：

10.1016/j.wasman.2021.04.058

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

We conducted ex-situ catalytic fast co-pyrolysis (co-CFP) of corn stalk (CS) and high-density polyethylene (HDPE) over HZSM-5 catalyst to enhance the production of hydrocarbons. The effect of pyrolysis temper-ature and CS-to-HDPE mass ratio (CS/HDPE) on the yield of condensable volatile organic products (CVOPs) and the relative content of hydrocarbons were studied. The synergisms between CS and HDPE were determined based on the difference between the experimental and theoretical CVOP and hydrocar-bons content. The results showed that the addition of HDPE significantly promotes the production of CVOPs, reaching the maximum value at 750 degrees C. In the presence of HZSM-5, the CVOP and hydrocarbons production, especially aromatics, were enhanced further, and 650 degrees C and 700 degrees C were the preferable pyrolysis temperature for desired products. Benzene, toluene, and xylenes were the predominant aromat-ics during the CFP process due to the good shape-selectivity of HZSM-5, contributing to the highest selec-tivity of C5-C11 compounds in C5+ hydrocarbons. CS/HDPE mass ratio of 1:1 was a critical point for enhancing aromatics yield. CS/HDPE < 1 was the recommended mass ratio for increasing the relative aro-matic hydrocarbons content, which increases as the CS/HDPE mass ratio decreases. Meanwhile, we pre-sented the potential reaction pathways between CS and HDPE to explain the synergistic effects during the co-CFP process. (c) 2021 Elsevier Ltd. All rights reserved.

引用

页码：189 / 199

页数：11

共 35 条

[1] Influence of the operating variables on the catalytic conversion of a polyolefin mixture over HMCM-41 and nanosized HZSM-5 [J].