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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >Striking influence of chain structure of polyethylene on the formation of cup-stacked carbon nanotubes/carbon nanofibers under the combined catalysis of CuBr and NiO
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Striking influence of chain structure of polyethylene on the formation of cup-stacked carbon nanotubes/carbon nanofibers under the combined catalysis of CuBr and NiO

机译：CuBr和NiO联合催化聚乙烯链结构对杯叠式碳纳米管/碳纳米纤维形成的惊人影响

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摘要

A one-pot approach was used to convert polyethylene (PE) with different chain structures into carbon nanomaterials (CNMs) under the combined catalysis of CuBr and NiO at 700 °C, including linear low density polyethylene (LLDPE), low density polyethylene (LDPE) and high density polyethylene (HOPE). The effect of chain structure of PE on the yield, morphology, microstructure, phase structure and thermal stability of CNMs, including cup-stacked carbon nanotubes (CS-CNTs) and carbon nanofibers (CNFs), were investigated by scanning electron microscope, transmission electron microscope (TEM), high-resolution TEM, X-ray diffraction, Raman spectroscopy and thermal gravimetric analysis. In addition, the degradation products from different chain structures of PE under the catalysis of CuBr were analyzed by gas chromatography and gas chromatography-mass spectrometry. It was demonstrated that the branched structure played an important effect in the degradation products of PE. The dehydrogenation and arom-atization of LLDPE were remarkably promoted by Br radicals from the decomposition of CuBr to form a large amount of light hydrocarbons and a relatively small amount of aromatics, favoring the formation of long and straight CS-CNTs. However, the degradation of LDPE was not obviously influenced by Br radicals due to its high extent of branched structure, while the random cleavage of HOPE was accelerated with the formation of a lot of oleflns with long chains, resulting in the formation of short and winding CNFs.; This work will contribute to the conversion of mixed waste polyolefin into high value-added CNMs.
机译：一锅法用于在700°C的CuBr和NiO的联合催化下，将具有不同链结构的聚乙烯（PE）转化为碳纳米材料（CNM），包括线性低密度聚乙烯（LLDPE），低密度聚乙烯（LDPE） ）和高密度聚乙烯（HOPE）。通过扫描电子显微镜，透射电镜研究了聚乙烯链结构对包括杯堆积碳纳米管（CS-CNT）和碳纳米纤维（CNF）在内的CNMs的产率，形态，微观结构，相结构和热稳定性的影响。显微镜（TEM），高分辨率TEM，X射线衍射，拉曼光谱和热重分析。另外，通过气相色谱和气相色谱-质谱法分析了CuBr催化下PE不同链结构的降解产物。结果表明，支链结构在PE的降解产物中起重要作用。 Cu分解产生的Br自由基明显促进了LLDPE的脱氢和芳香化反应，形成了大量的轻烃和相对少量的芳烃，有利于长而直的CS-CNT的形成。然而，LDPE的降解由于其高度的支链结构而不受Br自由基的明显影响，而HOPE的随机裂解则随着大量长链烯烃的形成而加速了HOPE的随机裂解，从而导致了短而卷曲的形成。 CNF。这项工作将有助于将混合废聚烯烃转化为高附加值的CNM。

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