Abstract Carbon nanotubes (CNTs) and activated carbon (AC) hybrids were obtained by co-pyrolysis of potassium hydroxide and bituminous coal. Scanning electron microscopy (SEM), thermogravimetric analysis (TGA), Raman spectroscopy, X-ray Diffraction (XRD), and nitrogen adsorption measurements were used to investigate the characteristics of the samples and the effects of the final pyrolysis temperature and time on the structure of the carbon materials. The results indicated that the optimal range for the pyrolysis temperature and time for CNT growth were 900–950 °C and 45–90 min, respectively. The diameters of the as-prepared CNTs were in the range of 50–250 nm and their lengths were ∼15 μm. During the pyrolysis process, potassium hydroxide not only acted as the catalytic precursor to catalyze the CNT growth but also reacted with carbon to produce abundant micropores. Furthermore, the content of CNTs in the product after demineralization was significantly reduced. It was further confirmed by Inductively Coupled Plasma (ICP) analysis that the content of Fe, Co, and Ni decreased after demineralization, indicating that minerals in coal play an important role in the growth of coal-based CNTs.

中文翻译：

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煤热解碳纳米管与活性炭混合物的研究

摘要 通过氢氧化钾和烟煤的共热解获得碳纳米管（CNTs）和活性炭（AC）杂化物。使用扫描电子显微镜 (SEM)、热重分析 (TGA)、拉曼光谱、X 射线衍射 (XRD) 和氮吸附测量来研究样品的特性以及最终热解温度和时间对结构的影响的碳材料。结果表明，CNT 生长的热解温度和时间的最佳范围分别为 900-950°C 和 45-90 分钟。所制备的碳纳米管的直径在 50-250 nm 范围内，其长度约为 15 μm。在热解过程中，氢氧化钾不仅作为催化前体来催化碳纳米管的生长，而且还与碳反应产生大量的微孔。此外，脱矿后产品中CNTs的含量显着降低。电感耦合等离子体 (ICP) 分析进一步证实，脱矿后 Fe、Co 和 Ni 的含量降低，表明煤中的矿物质在煤基碳纳米管的生长中起重要作用。