Title:
可視光領域で触媒活性を有する光触媒
Document Type and Number:
Japanese Patent JP4696414
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a photocatalyst which exhibits a high catalytic function in the visible light region. SOLUTION: The photocatalyst comprises a perovskite-type oxide in which a cation C having a valence lower than that of B ion is doped in the range up to 50 mol % and which is expressed by general formula: A<2+> B<4+> 1- XC<3+> XO3- δ, wherein X is >0 and <=0.5; δ is >0 and <0.5; A is at least one element selected from alkaline earth metal elements; B is at least one element selected from lanthanide and elements of groups IVa and IVb; and C is at least one element selected from lanthanide and elements of groups IIIa and IIIb. Though the energy band gap of the perovskite-type oxide is kept constant and similar to that of the perovskite-type oxide before being doped with the cation C, the wavelength region of light, where the oxide acts as the photocatalyst, is controlled by utilizing the acceptor level formed by doping the cation C and the impurity level caused by the external atmosphere, which is accelerated by generated by doping the cation C. Thereby, it becomes possible to allow the catalyst to effectively exhibit catalytic activities in the visible light region.
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Inventors:
Shinya Matsuo
Takahisa Omata
Takahisa Omata
Application Number:
JP2001221291A
Publication Date:
June 08, 2011
Filing Date:
July 23, 2001
Export Citation:
Assignee:
Sumitomo Metal Mining Co., Ltd.
International Classes:
B01D53/86; B01J23/08; B01J35/02; B01J23/10; C01F17/00; C01G25/00; C04B35/50
Domestic Patent References:
| JP63201051A | ||||
| JP7024329A | ||||
| JP10015394A | ||||
| JP9070541A | ||||
| JP2001232191A |
Foreign References:
| WO2002058842A1 |
Attorney, Agent or Firm:
Akira Ueda