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Preparation of fullerenes using carbon rods manufactured from Chinese hard coals

机译：用中国硬煤制造的碳棒制备富勒烯

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摘要

We report a feasibility study of producing fullerenes (C_60 and C_7o) using carbon rods manufactured from Chinese coal which is one of the cheapest natural resources of carbon. ADC arc method is employed using coal--derived carbon rods as electrode materials. The carbon rods are prepared from seven typical Chinese hard coals including bituminous coals and anthracite. The results show that all Chinese coals tested can be used to produce significant quantities of fullerenes. Their yields are strongly affected by the methods of preparing carbon electrodes and the parameters of the arc process, which are directly related to the coal properties and characteristics. Our results show that the two-step carbonisation method is significantly better than the one--step hot-pressing method with regard to the fullerene yields, as such the two-step method is recommended for fullerenes production from Chinese coals. It is found that the fullerene yield increases as the carbon content in coal increases and as ash content in coal decreases. This suggests that the mineral matter in coals could somehow inhibit the fullerenes production. An interesting linear relationship between the C_6o/C_70 ratios and the volatile matter content in Chinese coals is also noted.
机译：我们报告了使用中国煤炭生产的碳棒生产富勒烯（C_60和C_7o）的可行性研究，这是中国最便宜的碳自然资源之一。 ADC电弧法使用以煤为原料的碳棒作为电极材料。碳棒由七种典型的中国硬煤制成，包括烟煤和无烟煤。结果表明，所有经过测试的中国煤都可用于生产大量富勒烯。碳电极的制备方法和电弧工艺的参数会直接影响其收率，而碳电极的制备方法和电弧工艺的参数直接与煤的性质和特性有关。我们的结果表明，就富勒烯产量而言，两步碳化方法明显优于一步热压方法，因此建议将两步碳化方法用于中国煤炭生产富勒烯。已经发现，随着煤中碳含量的增加和煤中灰分含量的减少，富勒烯的产率也增加。这表明煤中的矿物质可能以某种方式抑制富勒烯的生产。还指出了C_6o / C_70比与中国煤中挥发性物质含量之间有趣的线性关系。

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