Advanced Composites and Hybrid Materials ( IF 23.2 ) Pub Date : 2021-08-05 , DOI: 10.1007/s42114-021-00317-x
Dengji Xu 1, 2 , Li Guo 1, 2 , Yanjun Chen 1, 2 , Changcheng Liu 2, 3 , Guanwudi Huang 4 , Chao Ding 5, 6
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Polyethylene (PE) occupies a large proportion in waste plastics, while its natural degradation rate is slow, if without timely recycling treatment, which would directly lead to serious ecological and environmental problems. Incineration and thermolysis methods based on thermochemical conversion are commonly used effective ways for the treatment of plastic waste, which presented the advantages of high efficiency and low pollution. In this paper, cone calorimeter and tubular thermolysis furnace-mass spectrometer (MS) combination platform were applied for the catalytical combustion and thermolysis characteristics of PE with three kinds of catalysts, which were H-Zeolite Standard Oil Corporation Of New York (Socony) Mobil-Five (HZSM-5), H-ultra stable Y zeolite (HUSY), and Mobil Composition of Matters-41 (MCM-41), respectively. Under the effect of MCM-41, the heat release rate (HRR) of samples under different heat flux (25, 35, 45 kW/m2) was decreased by 59.7%, 48.8%, and 46.6%, and the time to peak HRR was advanced in 60 s, 27 s, and 10 s, respectively. Therefore, the burning efficiency could be controlled and the fire risk would be declined with the addition of catalysts. With the increase of the catalyst pore diameter, the combustion efficiency was enhanced, while rising incineration temperature would not necessarily mean an increase in combustion efficiency. During thermolysis, HZSM-5 was most effective catalyst for the conversion of PE to alkenes and aromatic hydrocarbons (AHs) such as benzene, toluene, and xylene (BTX). Among the three catalysts, the microporous HZSM-5 showed higher catalytic performance due to its strong acidity and suitable pore structure. This work enriches the combustion and thermolysis mechanism of PE, and provides reference and basis for the design of waste plastic recycling processing.
Graphical abstract
The catalytic incineration and pyrolysis of polyethylene were investigated, which might provide reference for the waste plastic recycling processing design.
中文翻译:
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增强催化燃烧热解处理聚乙烯塑料废料
聚乙烯(PE)在废塑料中占很大比例,其自然降解速度慢,如果不及时回收处理,将直接导致严重的生态环境问题。基于热化学转化的焚烧和热解法是目前常用的处理塑料垃圾的有效方法,具有高效、低污染等优点。本文应用锥形量热仪和管式热解炉-质谱仪(MS)组合平台对PE与三种催化剂H-Zeolite Standard Oil Corporation Of New York (Socony) Mobil的催化燃烧和热解特性进行了研究。 -分别为五种 (HZSM-5)、H-超稳定 Y 沸石 (HUSY) 和 Mobil Composition of Matters-41 (MCM-41)。2) 分别降低了 59.7%、48.8% 和 46.6%,达到峰值 HRR 的时间分别提前了 60 秒、27 秒和 10 秒。因此,加入催化剂可以控制燃烧效率,降低火灾风险。随着催化剂孔径的增大,燃烧效率提高,而焚烧温度的升高并不一定意味着燃烧效率的提高。在热解过程中,HZSM-5 是将 PE 转化为烯烃和芳烃 (AH) 如苯、甲苯和二甲苯 (BTX) 的最有效催化剂。在三种催化剂中,微孔HZSM-5由于其强酸性和合适的孔结构显示出更高的催化性能。该工作丰富了PE的燃烧和热解机理,
图形概要
研究了聚乙烯的催化焚烧和热解,可为废塑料回收处理设计提供参考。