Boosting light olefin production from pyrolysis of low-density polyethylene: A two-stage catalytic process

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Journal of The Energy Institute Pub Date : 2024-11-01 DOI:10.1016/j.joei.2024.101872
Huawei Zhang, Hu Chen, Yincui Li, Shengnan Deng, Zizhen Ma, Yan Tan, Ting Liu
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Abstract

The increasing production of waste plastics poses significant environmental and health risks. Low-density polyethylene (LDPE), a major component of plastic waste, is a high-quality feedstock for pyrolysis due to its high carbon and hydrogen content. Traditional pyrolysis methods, such as thermal cracking and one-step catalytic pyrolysis, have limitations in yield and selectivity of valuable products like light olefins. This study introduces a two-stage catalytic pyrolysis (TSCP) process aimed at enhancing the production of light olefins from LDPE. In the first stage, LDPE undergoes pyrolysis with MCM-41 catalyst, yielding a substantial number of liquid products and a minor portion of light olefins. The second stage utilizes Mg-ZSM-5 catalyst to further crack the high-temperature volatile matter into light olefins. The optimal conditions identified were 450 °C in the first stage and 500 °C in the second stage, achieving a maximum light olefin yield of 45.80 wt% and a low reaction temperature, decreasing the energy consumption. Additionally, the MCM-41 catalyst demonstrates excellent regeneration performance, with only a slight decrease in liquid yield after nine cycles. The Mg-ZSM-5 catalyst maintains high stability, with light olefin yield remaining at 83.60 % of the initial yield after 48 h of operation.

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从低密度聚乙烯热解中提高轻烯烃产量:两阶段催化工艺
废塑料产量的不断增加给环境和健康带来了巨大风险。低密度聚乙烯(LDPE)是塑料废弃物的主要成分,由于其碳和氢含量高,是热解的优质原料。传统的热解方法(如热裂解和一步催化热解)在轻烯烃等有价值产品的产量和选择性方面存在局限性。本研究介绍了一种两阶段催化热解(TSCP)工艺,旨在提高低密度聚乙烯轻烯烃的产量。在第一阶段,低密度聚乙烯在 MCM-41 催化剂的作用下进行热解,产生大量液体产品和少量轻质烯烃。第二阶段使用 Mg-ZSM-5 催化剂将高温挥发物进一步裂解为轻质烯烃。确定的最佳条件为第一阶段 450 °C,第二阶段 500 °C,轻烯烃产量最高可达 45.80 wt%,且反应温度较低,降低了能耗。此外,MCM-41 催化剂的再生性能极佳,九次循环后液体产率仅略有下降。Mg-ZSM-5 催化剂保持了较高的稳定性,在运行 48 小时后,轻烯烃产量仍为初始产量的 83.60%。
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来源期刊
Journal of The Energy Institute
Journal of The Energy Institute 工程技术-能源与燃料
CiteScore
10.60
自引率
5.30%
发文量
166
审稿时长
16 days
期刊介绍: The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.
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