H-ZSM-5 Catalysts for the catalytic upcycling of polypropylene glycol
H-ZSM-5 Catalysts for the catalytic upcycling of polypropylene glycol
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DOI：
10.1016/j.apcatb.2023.122991
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
K. Shikhaliyev;T. Onsree;Andrew H. Jaeschke;S. M. Ghoreishian;Kaveh Shariati;Abraham Martinez;Alexander Katz;Sonjong Hwang;A. Gaffney;J. Urban-Klaehn;J. Lauterbach
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文献类型：
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作者：
K. Shikhaliyev;T. Onsree;Andrew H. Jaeschke;S. M. Ghoreishian;Kaveh Shariati;Abraham Martinez;Alexander Katz;Sonjong Hwang;A. Gaffney;J. Urban-Klaehn;J. Lauterbach
如果没有有效的管理，废塑料的稳步增加威胁着环境福祉和生态平衡。塑料UP/回收是一个很有前途的解决方案，但也存在许多挑战。本文研究了不同硅铝比(SiO_2/Al_2O_3)分别为23：1和50：1的H-ZSM-5沸石在350~550℃的氮气和水蒸气条件下对聚丙二醇(PPG)的催化裂解反应。对催化剂进行了物理吸附、化学吸附、固体幻角旋转核磁共振、热重分析、电子显微镜和正电子湮没寿命谱等表征。骨架铝和刘易斯-布朗斯特酸中心比对丙醛的选择性有显著影响，∼值可达80%。此外，还提出了PPG裂解反应的可能途径，这可能有助于更好地理解PPG和利用沸石基催化剂分解废塑料。
Without effective management, the steady increase of waste plastics threatens environmental well-being and ecological balance. Plastic up/recycling is a promising solution but has many challenges. In this work, catalytic cracking of polypropylene glycol (PPG) was investigated at varying reaction temperatures of 350–550 °C under nitrogen and steam, using H-ZSM-5 zeolites with different silica-to-alumina (SiO2/Al2O3) ratios of 23:1 and 50:1. The catalysts were assessed through physisorption, chemisorption, solid-state magic-angle spinning nuclear magnetic resonance spectrometry, thermogravimetry, electron microscopy, and positron annihilation lifetime spectroscopy. Extra framework aluminum and Lewis-to-Bronsted acid site ratios were found to play a significant role in the selectivity towards propionaldehyde, where values ∼ 80 % could be reached. In addition, a possible pathway for the PPG cracking reaction was proposed, which may lead to a better understanding of PPG and waste plastic decomposition via zeolite-based catalysts.