Graduate School of Science, Chiba University, 1-33 Inage-ku, Yayoi-cho, Chiba, 263-8522, Japan.
Langmuir. 2012 May 15;28(19):7564-71. doi: 10.1021/la3006986. Epub 2012 May 2.
Transitional metals (M) were dispersed on single-wall carbon nanohorns (M/SWCNHs, M = Fe, Co, Ni, Cu) by simple thermal treatment of the deposited metal nitrate without H(2) reduction. Nanometallic Ni particles on SWCNH were evidenced by high-resolution transmission electron microscopic observation and X-ray photoelectron spectroscopy. The nano-Ni dispersed on SWCNH showed the highest CH(4) decomposition activity; the activity of used transitional metals decreases in the order Ni ≫ Co > Fe ≫ Cu. On the other hand, the reaction rate over Ni/SWCNH was much larger than that over Ni/Al(2)O(3), and the former provided CO(x)-free H(2) and cup-stacked carbon nanotubes, while Ni/Al(2)O(3) produced CO(x) in addition to H(2). SWCNH was superior to Al(2)O(3) as the catalyst support of Ni for the CH(4) decomposition reaction.
过渡金属（M）通过简单的热处理沉积的金属硝酸盐而不进行 H(2)还原，分散在单壁碳纳米角（M/SWCNHs，M = Fe、Co、Ni、Cu）上。高分辨率透射电子显微镜观察和 X 射线光电子能谱证明了 SWCNH 上纳米金属 Ni 颗粒的存在。纳米 Ni 分散在 SWCNH 上表现出最高的 CH(4)分解活性；使用的过渡金属的活性按 Ni ≫ Co > Fe ≫ Cu 的顺序降低。另一方面，Ni/SWCNH 的反应速率远大于 Ni/Al(2)O(3)的反应速率，前者提供了无 CO(x)的 H(2)和堆积的碳纳米管，而 Ni/Al(2)O(3)除了 H(2)之外还产生了 CO(x)。SWCNH 作为 Ni 的 CH(4)分解反应的催化剂载体优于 Al(2)O(3)。
