Plasma-catalytic cracking of polyethylene over Ni/Hβ zeolites to light hydrocarbon fuels and hydrogen without external heating

IF 4.5 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Jianhui Han, Tianqi Yun, Chengxin Hou, Bingbing Chen, Tianhao Shi, Yanan Diao, Chuan Shi
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引用次数: 0

Abstract

The rapid accumulation of plastic waste poses severe environmental challenges. Cold plasma-driven degradation offers a promising route to convert plastic waste into high-value chemicals. In this study, a single-stage plasma reactor coupling cold plasma (dielectric barrier discharge) with Hβ zeolites was developed for polyethylene degradation under relatively mild conditions, without external thermal input or participation of noble metals. The effects of zeolite pore structure and acidity toward product distribution were investigated, revealing that Hβ-25 exhibited the highest C1–C6 yield (76 wt %) and a space-time yield of 103.8 mmol·gcat−1·h−1 compared to other zeolite catalysts during the plasma-catalytic process. Meanwhile, it was revealed that efficient pre-cracking initiated by plasma activation and the optimal structural compatibility between Hβ-zeolite pore channels and primary cracking products were the key factors enabling the selective conversion of polyethylene into C1–C6 hydrocarbons. Additionally, metal incorporation significantly enhanced C–H bond cleavage compared to Hβ-25 support. Especially, 10Ni/Hβ-25 exhibited the highest hydrogen yield (7.87 mmol·gplastic−1) under plasma-assisted mode, markedly surpassing its yield under thermal-cracking conditions, demonstrating the significant potential of plasma-catalytic degradation for hydrogen production from polyethylene.

等离子体催化Ni/Hβ沸石上的聚乙烯裂解为轻烃燃料和氢气,无需外部加热
塑料垃圾的迅速堆积给环境带来了严峻的挑战。冷等离子体驱动的降解为将塑料废物转化为高价值化学品提供了一条有前途的途径。在本研究中,在相对温和的条件下,在没有外部热输入或贵金属参与的情况下,开发了冷等离子体(介质阻挡放电)与Hβ沸石耦合的单级等离子体反应器,用于聚乙烯降解。研究了沸石孔隙结构和酸度对产物分布的影响,结果表明,在等离子体催化过程中,h β-25的C1-C6产率最高(76 wt %),空时产率为103.8 mmol·gcat−1·h−1。同时,发现等离子体活化引发的高效预裂化以及h - β-沸石孔通道与初裂化产物之间的最佳结构相容性是聚乙烯选择性转化为C1-C6烃的关键因素。此外,与h - β-25载体相比,金属掺入显著增强了C-H键的裂解。特别是,10Ni/ h - β-25在等离子体辅助模式下的产氢率最高(7.87 mmol·gplastic−1),明显超过热裂解条件下的产氢率,显示了等离子体催化降解聚乙烯制氢的巨大潜力。
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来源期刊
CiteScore
7.60
自引率
6.70%
发文量
868
审稿时长
1 months
期刊介绍: Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.
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