期刊
APPLIED SURFACE SCIENCE
卷 254, 期 23, 页码 7604-7607出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2008.01.120
关键词
single-site photocatalyst; platinum nanoparticle; photo-deposition; CO oxidation
类别
资金
- Ministry of Education, Culture, Sports, Science and Technology [17360388]
- Spring-8 [2006A1279-NXa-np]
- Photon Factory of KEK [2005G039]
- Joining and Welding Research Institute (JWRI) of Osaka University
- Grants-in-Aid for Scientific Research [17360388] Funding Source: KAKEN
Pt particles in a uniform dispersion were successfully synthesized on single-site photocatalyst (Ti-containing mesoporous silica (Ti-HMS)) under UV-light irradiation by a photo-assisted deposition (PAD) method. Using an aqueous solution of H2PtCl6 as a precursor, the nano-sized Pt metal particles were deposited directly on the photo-excited tetrahedrally coordinated titanium oxide moieties within the framework of mesoporous silica (PAD-Pt/Ti-HMS). The Pt catalysts were characterized by means of XRD, Pt L-III-edge XAFS, CO adsorption, and TEM analysis. It was demonstrated that Pt particles had mean diameter of 4 nm in a narrow size distribution. Meanwhile, Pt particles loaded by a conventional impregnation method (imp-Pt/Ti-HMS) showed a wide size distribution ranging from 2 to 30 nm. The PAD-Pt/Ti-HMS catalyst was more active in the CO oxidation than the conventional impregnated imp-Pt/Ti-HMS catalyst. It is suggested that the PAD method using single-site photocatalyst is a useful and unique technique to prepare fine and uniform Pt nanoparticles. (c) 2008 Elsevier B.V. All rights reserved.
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