Abstract In this paper, the changes in solid-phase carbon structure and the formation of carbon nanotubes in the process of K-catalyzed pyrolysis of bituminous coal were investigated. The results showed that the content of carbon nanotubes in K-catalyzed coal pyrolysis products increased with the extension of residence time. When the residence times were 0, 30 and 90 min, the yields of carbon nanotubes in the coal pyrolysis products were 1.98 wt%, 6.85 wt% and 10.16 wt%, respectively. It was found that the aromatic carbon C C, C H and ether carbon C-O-C structures in coal were the main carbon sources for the growth of carbon nanotubes. The probable growth mechanism of carbon nanotubes in the process of K-catalyzed coal pyrolysis was proposed to be as follows: aromatic C C and C H structures in coal convert K components such as K2CO3 and K2O into metal K, and then metal K converts carbon atoms in the ether bond C-O-C structure into carbon atoms or clusters, which generate carbon nanotubes under the action of Fe catalyst particles in coal. This method provides a new strategy for the simultaneous high-value utilization of coal resources and macroscopic, low-cost preparation of carbon nanotubes.

中文翻译：

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K-催化煤中固体碳结构转化为碳纳米管的机理

摘要 本文研究了钾催化烟煤热解过程中固相碳结构的变化和碳纳米管的形成。结果表明，钾催化煤热解产物中碳纳米管的含量随着停留时间的延长而增加。当停留时间为0、30和90 min时，煤热解产物中碳纳米管的产率分别为1.98 wt%、6.85 wt%和10.16 wt%。发现煤中的芳碳CC、CH和醚碳COC结构是碳纳米管生长的主要碳源。提出碳纳米管在钾催化煤热解过程中可能的生长机理如下：煤中的芳香CC和CH结构将K2CO3和K2O等K组分转化为金属K，然后金属K将醚键COC结构中的碳原子转化为碳原子或簇，在Fe催化剂颗粒的作用下生成碳纳米管。煤炭。该方法为同时高价值利用煤炭资源和宏观、低成本制备碳纳米管提供了新策略。