Nanoporosities and catalytic activities of Pd-tailored single wall carbon nanohorns.
The nanoporosities and catalytic activities of Pd nanoparticles dispersed on single wall carbon nanohorns (Pd-SWCNHs) and oxidized single wall carbon nanohorns (Pd-ox-SWCNHs) were examined. A transmission electron microscopy (TEM) observation indicated that Pd nanoparticles of 2-3 nm size were highly dispersed on both the SWCNHs. X-ray photoelectron spectra and N2 adsorption isotherms at 77 K illustrated the differences in the deposition process mechanisms of the Pd-SWCNHs and Pd-ox-SWCNHs; the deposition process depended on the surface functional groups. The supercritical H2 adsorption isotherms at 77 K suggested the relationships between the interaction of Pd-SWCNHs and Pd-ox-SWCNHs with H2 and the catalytic activities for a water formation reaction in a gas phase at 273 or 298 K. The catalytic activity measurement and TEM observation of the catalysts after the reactions demonstrated that the Pd-SWCNHs and Pd-ox-SWCNHs are promising catalysts.
Itoh
Tsutomu
T
Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba-shi 263-8522, Japan.
Urita
Koki
K
Bekyarova
Elena
E
Arai
Miki
M
Yudasaka
Masako
M
Iijima
Sumio
S
Ohba
Tomonori
T
Kaneko
Katsumi
K
Kanoh
Hirofumi
H