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Article Abstract
Due to their outstanding physicochemical properties, carbon nanotubes (CNTs) have been widely studied and applied in the nanoscience and nanotechnology fields. Herein, Fe-based catalysts were prepared by the impregnation method using AlO, SiO, ZrO, TiO and SnO supports and were used for CNT synthesis from -hexane under different reaction times and temperatures. It was found that the metal-support interaction and FeO particle size of Fe-based catalysts regulated CNT growth. The moderate metal-support interaction of Fe-AlO, Fe-SiO and Fe-ZrO was suitable for CNT synthesis: Fe-AlO and Fe-SiO produced 383.2-494.6 mg g CNTs with a diameter of 23.3-26.4 nm, while Fe-ZrO exhibited a lower CNT yield of 141.8 mg g with a larger diameter of 49.3 nm. Fe-TiO metal-support interaction was too strong, and the SnO support exhibited strong reducibility, both of which inhibited CNT synthesis. Since FeO particle stepwise participated in CNT synthesis in the activity order, it led to an increased quantity but a decreased formation rate of CNTs with prolonged reaction time, which could be compensated by increasing the reaction temperature.
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