Integrating microwave pyrolysis and hydrotreating for converting low-density polyethylene into jet fuel

Ting Luo, Wenguang Zhou, Yunpu Wang, Haiwei Jiang, Jiabo Wu, Jinye Hu, Mengjiao Wang, Weixin Wang, Qi Wang, Yuhang Hu and Liangliang Fan

Renewable Energy, 2024, vol. 236, issue C

Abstract: With the increasing plastic waste and its environmental impact, finding effective recycling solutions is essential. Cracking plastic waste followed by hydrogenation could be a promising method for producing jet fuels. In the present work, microwave-assisted pyrolysis (MAP) with MgO combined with hydrotreating with a Ni/Biochar catalyst was firstly proposed to convert low-density polyethylene (LDPE) into jet fuel. The pyrolysis process yielded 48.5 wt% of liquid product, with C5−C15 hydrocarbons and olefins accounting for 87.6% and 65.5%, respectively. During the hydrotreating process with 10% Ni/Biochar at 300°C of temperature and 2 MPa of initial H2 pressure, the pyrolysis oil was successfully hydrotreated, resulting in 98.4% paraffins and 1.6% aromatics with liquid yield of 80.6 wt%. Among them, C5−C15 hydrocarbons created 96.1%. The kinetic analysis indicated an activation energy of 89.9 kJ/mol for hydrogenated LDPE pyrolysis oil (HPPO). Characterization of the Ni/Biochar catalyst after reaction showed a BET surface area of 438 m2/g, similar to that of the fresh catalyst, with minimal coke formation noted via XRD, TEM, and TG analyses. XPS and FTIR indicated negligible oxidation of Ni0 during hydroprocessing. After 6 cycles, the catalyst remained high abundance for paraffins and C5−C15 hydrocarbons, namely, 98.4% and 94.0%, respectively, demonstrating its stability.

Keywords: LDPE; Microwave pyrolysis; Hydroreforming; Ni/Biochar; Jet fuel (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:236:y:2024:i:c:s0960148124015003

DOI: 10.1016/j.renene.2024.121432

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