Hydrogen and aromatics recovery through plasma-catalytic pyrolysis of waste polypropylene



Xiao, Haoyu, Harding, Jonathan ORCID: 0000-0002-9920-7831, Lei, Shuaishuai, Chen, Wei, Xia, Sunwen, Cai, Ning, Chen, Xu, Hu, Junhao, Chen, Yingquan, Wang, Xianhua
et al (show 3 more authors) (2022) Hydrogen and aromatics recovery through plasma-catalytic pyrolysis of waste polypropylene. JOURNAL OF CLEANER PRODUCTION, 350. p. 131467.

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: Plastic waste, Catalytic pyrolysis, Plasma enhanced, Hydrogen, Aromatics
Divisions: Faculty of Science and Engineering > School of Electrical Engineering, Electronics and Computer Science
Depositing User: Symplectic Admin
Date Deposited: 06 Apr 2022 13:30
Last Modified: 24 Mar 2023 02:30
DOI: 10.1016/j.jclepro.2022.131467
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3152261