热解
催化作用
焦炭
化学
化学工程
聚丙烯
甲苯
二甲苯
催化裂化
介质阻挡放电
选择性
甲醇
有机化学
材料科学
工程类
电极
物理化学
作者
Haoyu Xiao,Jonathan Harding,Shuaishuai Lei,Wei Chen,Haiping Yang,Ning Cai,Xu Chen,Junhao Hu,Yingquan Chen,Xianhua Wang,Xin Tu,Haiping Yang,Hanping Chen
标识
DOI:10.1016/j.jclepro.2022.131467
摘要
Plasma-catalysis pyrolysis is a promising way to solve the problem of catalyst deactivation during plastic recycling. In this study, pyrolysis of polypropylene (PP) over zeolite ZSM-5 has been carried out in a two-stage fixed bed pyrolysis system with a coaxial dielectric barrier discharge (DBD) plasma reactor. The role of plasma on the pyrolysis process, as well as the stability of the plasma-catalytic system was investigated. Compared to conventional catalytic pyrolysis, plasma-catalysis pyrolysis increased gas products from 29 wt% to 47 wt% with 4.19 mmol/g H2 formed, and improved the selectivity of BTX (benzene, toluene, xylene) whilst inhibiting the production of wax simultaneously. After 10 cycles, clear decreases in gas and oil yield (from 86 wt% to 48 wt%) and BTX selectivity (from 71 wt% to 39 wt%) were found in the conventional catalytic pyrolysis, however, nearly no variation was shown in the plasma-catalysis mode. The coupling of catalyst and plasma modified the catalysts acidic sites, while the radicals enhanced the pre-cracking of volatiles, resulting in less deposited coke. Overall, the introduction of plasma resulted in an obvious reduction in total costs and presented a feasible strategy for the recycling of waste plastic.
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