TiO2-nanotubes;
Pt;
Au nanocatalysts;
in-situ IR;
CO2;
hydrogenation;
CO oxidation;
TITANIA;
WATER;
D O I:
10.1016/j.synthmet.2005.07.254
中图分类号:
T [工业技术];
学科分类号:
08 ;
摘要:
TiO2-nanotubes were prepared by hydrothermal treatment of TiO2 powders in concentrated NaOH solution at 110 degrees C for 90 hours. The immobilization of Pt and Au was carried out by photochemical deposition method with TiO2-nanotubes suspending in an aqueous solution containing H2PtCl6 center dot 6H(2)O or HAuCl4-3H(2)O. Transmission electron micrographs revealed that the diameter of the as-made TiO2-nanotube is about 10 nm with an inner diameter around 6 run. The nanotube shows layered structures similar to the carbon nanotubes. The layer spacing is about 0.88 nm. Nanosized Pt (similar to 2 nm) and Au (similar to 10 nm) particles were dispersed uniformly on the surface of the nanotubes. The BET surface area of the nanotube is similar to 200 m(2)/g as estimated by N-2 adsorption isotherm, that was not significantly affected after the immobilization of Pt or Au. In-situ IR spectroscopic studies revealed that the Pt/TiO2-nanotube is highly active for CO2 hydrogenation, while Au/TiO2-nanotube exhibits pronounced activity for CO oxidation at room temperature. In general, Pt/TiO2-nanotubes presents a relatively higher activity than Au/TiO2-nanotubes, and the catalytic activities of TiO2 supported Pt and Au catalysts are significantly enhanced by the high surface area of TiO2-nanotube.
机构:
Chubu Elect Power Co Inc, Electrotechnol Applicat R&D Ctr, Midori Ku, Nagoya, Aichi 459, JapanChubu Elect Power Co Inc, Electrotechnol Applicat R&D Ctr, Midori Ku, Nagoya, Aichi 459, Japan
Kasuga, T
Hiramatsu, M
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机构:Chubu Elect Power Co Inc, Electrotechnol Applicat R&D Ctr, Midori Ku, Nagoya, Aichi 459, Japan
Hiramatsu, M
Hoson, A
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h-index: 0
机构:Chubu Elect Power Co Inc, Electrotechnol Applicat R&D Ctr, Midori Ku, Nagoya, Aichi 459, Japan
Hoson, A
Sekino, T
论文数: 0引用数: 0
h-index: 0
机构:Chubu Elect Power Co Inc, Electrotechnol Applicat R&D Ctr, Midori Ku, Nagoya, Aichi 459, Japan
Sekino, T
Niihara, K
论文数: 0引用数: 0
h-index: 0
机构:Chubu Elect Power Co Inc, Electrotechnol Applicat R&D Ctr, Midori Ku, Nagoya, Aichi 459, Japan
机构:
Chubu Elect Power Co Inc, Electrotechnol Applicat R&D Ctr, Midori Ku, Nagoya, Aichi 459, JapanChubu Elect Power Co Inc, Electrotechnol Applicat R&D Ctr, Midori Ku, Nagoya, Aichi 459, Japan
Kasuga, T
Hiramatsu, M
论文数: 0引用数: 0
h-index: 0
机构:Chubu Elect Power Co Inc, Electrotechnol Applicat R&D Ctr, Midori Ku, Nagoya, Aichi 459, Japan
Hiramatsu, M
Hoson, A
论文数: 0引用数: 0
h-index: 0
机构:Chubu Elect Power Co Inc, Electrotechnol Applicat R&D Ctr, Midori Ku, Nagoya, Aichi 459, Japan
Hoson, A
Sekino, T
论文数: 0引用数: 0
h-index: 0
机构:Chubu Elect Power Co Inc, Electrotechnol Applicat R&D Ctr, Midori Ku, Nagoya, Aichi 459, Japan
Sekino, T
Niihara, K
论文数: 0引用数: 0
h-index: 0
机构:Chubu Elect Power Co Inc, Electrotechnol Applicat R&D Ctr, Midori Ku, Nagoya, Aichi 459, Japan