J. Japan Association on Odor Environment Vol..* No.,,**3. TiO, TiO TiO *, TiO. TiO - / . V vs. NHE. WO TiO. TiO 2 +* WO- **+ **,+,+ +*

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1 J. Japan Association on Odor Environment Vol..* No. ** TiO + TiO TiO TiO.** nm TiO O O + +.1* nm TiO O / O TiO 0 1 O O */. V vs. NHE TiO TiO *. V vs. NHE O TiO TiO 2 +* + O */. *2. V O **+ **+ + +*

2 94.* + + TiO O + wt STEM TiO O + * 2. **.0 O Pt TiO : H PtCl O Pt PtO STEM Scanning Transmission Electron Microscope : / Pt e PtO Pt O PtO O TiO Pt NTiO Pt O e O. V Pt O H e HO. V h ++. PtO 0

3 J. Japan Association on Odor Environment Vol..* No. **3 95. * / *./ wt AcH * CO O PtO CO AcH +*** ppm +/ mmol AcH CH CHO/ O CO HO TiO P / NTiO +* PtO CO O 0/ nm * PA : Photo Acoustic O CO / PA bare Pt Pd / + / PtO CO / e 0 / O Pt 0A + 0A CO Pt 0B. CH OH h HCHO H

4 96.* + / 0/ + / 0 nm / 0 O O 0 A at 0/ nm O PA B 1 at 0/ nm N / / / / / Pt O Pt O 2A Pt Pt Pd 2B 2C / / 3 CO O Pt PA / wt O / Pt *+. */. TiO 0/ TiO / nm PA TiO NTiO 1 O N Pt

5 J. Japan Association on Odor Environment Vol..* No. ** / CO O ca. */. V vs. NHE O O H e H O *. 02 V vs. NHE O O CO H O +* O PtO CO HO O 2 CO CH COOH H O 2 h CO 2H CO H O + : CH COOH H O. O CO. H O 2 at 0/ nm A Pt O B O C O CO H O + : PtO HO Pt HO CO O

6 98.* + +* HO CO ++ PtO O O Pt O Pt O ++ O *+. wt 0 O O O O +*

7 J. Japan Association on Odor Environment Vol..* No. ** O Pt O Pt TiO O Pt NEDO : + Asahi R. Morikawa T. Ohwaki T. Aoki K. and Taga Y. : VisibleLight Photocatalysis in Nitrogen (**). Doped Titanium Oxides Science (**+). Ohno T. Mitsui T. and Matsumura M. : Photocata ter Sensitized by O Powder J. Chem. Soc. Faraday Trans. 12 /301 ( +32 ).. Erbs. Desilvestro J. Borgarello E. and Grätzel M. : VisibleLightInduced O Generation from Aqueous Dispersions of O J. Phys. Chem. 22.**+.**0 ( +32. ). / Abe R. Sayama K. and Sugihara H. : Development of new photocatalytic water splitting into H a shuttle redox mediator IO /I +*3 Composite Photocatalyst under Visible Light Irradiation J. Phys. Chem. C +++ 1/1. 1/11 (**1). 2 Ishibashi K. Fujishima A. atanabe T. and Hashimoto K. : Generation and Deactivation Processes of Ions Langmuir +2.1/. (**). and O using two di# erent semiconductor photocatalysts and +0*/ +0*0+ (**/). 0 Sclafani A. Palmisano L. Marci G. and Venezia A. M. : Influence of platinum on catalytic activity of polycrystalline O employed for phenol photodegradation in aqueous suspension Solar Energy Materials and Solar Cells /+ * +3 ( +332). 1 Arai T. Yanagida M. Konishi Y. Iwasaki Y. Sugihara H. and Sayama K. : E$ cient Complete Decomposition of Acetaldehyde into CO over CuBi O /O Superoxide Formed on TiO Film Illuminated by Very eak UV Light in Air or ater J. Phys. Chem. B +* (***). 3 Hirakawa T. and Nosaka Y. : Properties of O and OH Formed in TiO Aqueous Suspensions by Photocatalytic Reaction and the Influence of H O and Some +* Mrowetz M. Balcerski. Colussi A. J. and Ho# mann M. R. : Oxidation Power of NitrogenDoped TiO Photocatalysts under Visible Light J. Phys. Chem. B +* (**.). ++ Abe R. Takami H. Murakami N. Ohtani B. : Pristine Simple Oxide as Visible Light Driven Photocatalysts : Highly E$ cient Decomposition of Organic Compounds over Platinumloaded Tungsten Oxide J. Am. Chem. Soc. +* 112* 112+ (**2). + Murakami N. PrietoMahaney O.O. Abe R. Torimoto T. and Ohtani B. : DoubleBeam Photoacoustic Spectroscopic Studies on Transient Absorption of Titalytic Activity of Sdoped TiO Photocatalyst under Visnium(IV) Oxide Photocatalyst Powders J. Phys. Chem. C / (**1). + He Y. u Z. Fu L. Li C. Miao Y. Gao L. Fan H. and Zou B. : Photochromism and Size E# ect of O and O TiO Aqueous Sol Chem. Mater. +/.*3.*./ ible Light Chem. Lett. 0. 0/ (**). Darwent J. R. and Mills A. : Photooxidation of a J. Phys. Chem. B.

8 100.* + Development of highly e$ cient visible light responsive photocatalysts based on tungsten oxide Ryu ABE Catalysis Research Center Hokkaido University North + est +* Kitaku Sapporo Japan **+ **+ ryuabe@cat.hokudai.ac.jp Abstract Tungsten oxide loaded with nanoparticulate platinum (PtO ) is demonstrated to exhibit high activity for the decomposition of organic compounds both in liquid and gas phases ; the activity was almost comparable to that of titanium oxides (TiO ) under UV light irradiation and much higher than that of nitrogendoped TiO under visible irradiation. The high activity of PtO was found to be due to the promotion of multielectron reduction of O to hydrogen peroxide (H O ) on the Pt cocatalyst Key words : Photocatalyst Visible light Tungsten oxides Pt cocatalyst