US 9,808,791 B2
Visible-light photocatalyst particles and method for manufacturing same
Hiromasa Tokudome, Kanagawa-ken (JP); and Sayuri Okunaka, Kanagawa-ken (JP)
Assigned to Toto Ltd., Fukuoka (JP)
Appl. No. 14/404,561
Filed by TOTO LTD., Kitakyushu-shi, Fukuoka (JP)
PCT Filed May 29, 2013, PCT No. PCT/JP2013/065519
§ 371(c)(1), (2) Date Nov. 28, 2014,
PCT Pub. No. WO2013/180307, PCT Pub. Date Dec. 5, 2013.
Claims priority of application No. 2012-122042 (JP), filed on May 29, 2012; and application No. 2012-207784 (JP), filed on Sep. 21, 2012.
Prior Publication US 2015/0107984 A1, Apr. 23, 2015
Int. Cl. B01J 23/58 (2006.01); C01B 3/04 (2006.01); C01B 3/06 (2006.01); C01G 23/00 (2006.01); B82Y 30/00 (2011.01); B01J 37/03 (2006.01); B01J 21/06 (2006.01); B01J 23/46 (2006.01); B01J 35/00 (2006.01); B01J 35/02 (2006.01); B01J 37/02 (2006.01); B01J 19/12 (2006.01)
CPC B01J 23/58 (2013.01) [B01J 19/127 (2013.01); B01J 21/063 (2013.01); B01J 23/464 (2013.01); B01J 35/004 (2013.01); B01J 35/023 (2013.01); B01J 37/0211 (2013.01); B01J 37/033 (2013.01); B01J 37/036 (2013.01); B82Y 30/00 (2013.01); C01B 3/04 (2013.01); C01B 3/042 (2013.01); C01B 3/06 (2013.01); C01G 23/006 (2013.01); C01P 2002/50 (2013.01); C01P 2002/54 (2013.01); C01P 2004/03 (2013.01); C01P 2004/04 (2013.01); C01P 2004/64 (2013.01); Y02E 60/364 (2013.01)] 11 Claims
OG exemplary drawing
 
1. Rhodium-doped strontium titanate particles having a primary particle diameter of not more than 70 nm and having
an absorbance at a wavelength of 570 nm of not less than 0.6 and
an absorbance at a wavelength of 1800 nm of not more than 0.7,
each absorbance being determined by measuring a diffuse reflection spectrum, and
a molar ratio represented by M (rhodium)/M (titanium+rhodium) of 0.001 to 0.03.
 
8. A process for producing the rhodium-doped strontium titanate particles having a primary particle diameter of not more than 70 nm and having an absorbance at a wavelength of 570 nm of not less than 0.6 and an absorbance at a wavelength of 1800 nm of not more than 0.7, each absorbance being determined by measuring a diffuse reflection spectrum, comprising:
providing a solution of a titanium compound, a rhodium compound, a strontium compound, and a hydrophobic complexing agent dissolved in water; and drying the solution to obtain a residue and firing the residue.