Sumitomo Metal Industries, Inc.

Osaka Titanium Technologies Co., Ltd.

Katsuhiro Nishihara

Yasuhiro Masaki

Haruhiko Kajimura

Tadashi Ogasawara

Munetoshi Watanabe

Tadashi Fukuda

Rie Katsui

Shiji Shimosaki

Kouji Oda

Katsumi Okada

Sadanobu Nagaoka

Michiyasu Takahashi

Tadashi Yao

A titanium oxide-based photocatalyst which can exhibit excellent photocatalytic properties in response to visible light while maintaining its inherent activity in response to ultraviolet light and which is suitable for mass production contains bismuth as a first additional metal component and at least one metal element selected from silicon, zirconium, aluminum, and hafnium as a second additional metal component in titanium oxide. The Bi/Ti atomic ratio is preferably at least 0.0001 and at most 1.0, the atomic ratio of the second additional metal to Ti is preferably at least 0.0001 and at most 0.8, and a portion of bismuth is preferably present in the form of lower valence (Bior Bi). The presence of lower valence bismuth can be ascertained by XPS analysis.

Titanium oxide photocatalyst, method for producing same and use thereof

Titanium oxide-based photocatalysts which contain a metal halide in titanium oxide and which are prepared from titanium oxide and/or its precursor, which may optionally be heat treated, by contact with a reactive gas containing a metal halide of the formula MXor MOX(wherein M=a metal, X=a halogen, and n=an integer) with heating stably develop a high photocatalytic activity with visible light irradiation. The photocatalysts may subsequently be stabilized by contact with water or by heat treatment, and/or promoted by contact with a heteropoly acid and/or an isopoly acid so as to include a metal complex in the titanium oxide. Photocatalysts prepared in this manner exhibit novel ESR features. The present invention also provides methods for preparing these photocatalysts, a photocatalyst dispersion and a photocatalytic coating fluid containing such a photocatalyst, and photocatalytic functional products and methods for their manufacture using the photocatalyst.

Titanium oxide photocatalyst, process for producing the same and application

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Amagasaki, Japan

Katsuhiro Nishihara