Sumitomo Metal Industries, Inc.

Osaka Titanium Technologies Co., Ltd.

Michiyasu Takahashi

Haruhiko Kajimura

Yasuhiro Masaki

Tadashi Ogasawara

Munetoshi Watanabe

Katsuhiro Nishihara

Shiji Shimosaki

Kouji Oda

Katsumi Okada

Sadanobu Nagaoka

Tadashi Yao

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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Nishinomiya, Japan

Michiyasu Takahashi