Study on the key influencing factors of KOH-catalyzed coal pyrolysis for direct preparation of carbon nanotubes

Abstract

The environmental pollution and greenhouse gas emission caused by the traditional utilization of coal such as combustion, coking and gasification are becoming increasingly apparent. Green and environmentally friendly coal utilization technology is an effective way to solve this problem. In this study, high-value carbon nanotubes (CNTs) were directly prepared from coal by catalytic pyrolysis with low KOH content. It was found that when the KOH additive amount was 50 wt%, the influence of three main factors on the preparation of CNTs was as follows: pyrolysis temperature＞residence time＞heating rate. Pyrolysis temperature of 900 °C, heating rate of 15 °C/min, and residence time of 60 min were the best combination of KOH-catalyzed coal pyrolysis to prepare CNTs, and the content of CNTs in the corresponding sample was 10.01 wt%. This study has a specific contributes to the high-value transformation and utilization of coal resources and the preparation of CNTs.