title: Formation of CO(x)-free H2 and cup-stacked carbon nanotubes over nano-Ni dispersed single wall carbon nanohorns.
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.
authors.affiliation: Graduate School of Science, Chiba University, 1-33 Inage-ku, Yayoi-cho, Chiba, 263-8522, Japan.
authors.forename: Shuwen
authors.initials: S
authors.lastname: Wang
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Itoh
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Fujimori
authors.forename: Mateus
authors.initials: M
authors.lastname: Monteiro de Castro
authors.forename: Ana
authors.initials: A
authors.lastname: Silvestre-Albero
authors.forename: Francisco
authors.initials: F
authors.lastname: Rodríguez-Reinoso
authors.forename: Tomonori
authors.initials: T
authors.lastname: Ohba
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Kanoh
authors.forename: Morinobu
authors.initials: M
authors.lastname: Endo
authors.forename: Katsumi
authors.initials: K
authors.lastname: Kaneko