The effect of reduction temperature on Co-Mo/Al₂O₃ catalysts for carbon nanotubes formation

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• 作者：Siang-Piao Chai ; Sharif Hussein Sharif Zein ; Abdul Rahman Mohamed
• 刊名：Applied Catalysis A ; General
• 出版年：2007
• 期刊代码：4_0926860x
• 类别：ch
• 出版时间：15 July 2007
• 卷：326
• 期：2
• 页码：173-179
• 文件大小：888 K

摘要

Catalyst reduction temperature was observed to affect the yield and diameter uniformity of carbon nanotubes (CNTs) produced on Co-Mo/Al₂O₃ catalysts. The results show that on the whole, the reduced catalysts gave higher carbon yield. The CNTs obtained from the unreduced catalyst and the catalysts reduced at 400, 550, and 700 °C had diameters of 9.0 ± 1.4, 11.0 ± 1.8, 11.2 ± 1.8, and 12.1 ± 2.7 nm, respectively, showing that an increase in catalyst reduction temperature produced a slightly larger average diameter and wider diameter distribution. Raman spectra further elucidate that better-graphitized CNTs were produced on the catalysts reduced with increasing reduction temperatures.