Formation of CO(x)-free H2 and cup-stacked carbon nanotubes over nano-Ni dispersed single wall carbon nanohorns |
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Authors: | Wang Shuwen Itoh Tsutomu Fujimori Toshihiko Monteiro de Castro Mateus Silvestre-Albero Ana Rodríguez-Reinoso Francisco Ohba Tomonori Kanoh Hirofumi Endo Morinobu Kaneko Katsumi |
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Affiliation: | Graduate School of Science, Chiba University, 1-33 Inage-ku, Yayoi-cho, Chiba, 263-8522, Japan. |
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Abstract: | 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. |
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