| Summary: | 碩士 === 國立中央大學 === 化學工程與材料工程研究所 === 94 === Titanium nanotubes were prepared from titanium powers by
treating with 10 M NaOH at 110~130℃ for 24 hours(Chemical method).
Excess NaOH was then neutralized with distilled water and HCl(aq). The
TiO2 nanotubes were characterized by X-ray diffraction (XRD), specific
surface area (BET), and transmission election microscope (TEM). Then
we prepare Au/TiO2, Pt/TiO2 by deposition precipitation and incipient
wetness methods. And we prepare Pt/TiO2 by photochemical deposition
method. We can evaluate the activities of these catalysts by hydrogen
production of methanol reforming under ultraviolet light (350nm)
irradiation. We use XRD, BET, and TEM to analyze various catalysts.
The TiO2 nanotubes were prepared by chemical method with inner
diameters of approximately 8 nm and outer diameters 12nm and 100 nm
lengths. The gold on the surface of TiO2 by deposition precipitation
method is hemisphere and the Au particles size is 4~7 nm. And we use
photochemical deposition method to prepare Pt/TiO2, the Pt particles size
is about 1nm. When Au/TiO2 and Pt/TiO2 were calcined at higher
temperature the particles size gets bigger. The catalytic activity is
strongly dependent on the gold and platinum particles size, the smaller
particles produces higher amount of hydrogen.
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