US 7,576,029 B2
	Catalyst
Masayuki Saito, Hiratsuka (Japan); and Takeyuki Sagae, Hiratsuka (Japan)
Assigned to Tanaka Kikinzoku Kogyo K.K., Tokyo (Japan)
Appl. No. 10/587,066 PCT Filed Mar. 18, 2005, PCT No. PCT/JP2005/004951 § 371(c)(1), (2), (4) Date Jul. 20, 2006, PCT Pub. No. WO2005/092494, PCT Pub. Date Oct. 06, 2005.
Claims priority of application No. 2004-090349 (JP), filed on Mar. 25, 2004.
Prior Publication US 2007/0161506 A1, Jul. 12, 2007
Int. Cl. B01J 23/10 (2006.01)

U.S. Cl. 502—302

5 Claims

1. A catalyst for purifying an automotive exhaust gas comprising catalytic metal particles supported on a porous carrier, wherein the catalytic metal particles consist essentially of an alloy of two precious metals selected from platinum, palladium, and rhodium, wherein the porous carrier consists essentially of ceria-zirconia having a ceria content of from 15 wt % to 48.2 wt %, wherein the porous carrier has a specific surface area of 10 to 250 m2/g for 1 wt % of an amount of catalytic metal supported relative to the whole catalyst, wherein the catalytic metal particles have from 10 to 50000 atoms, and wherein the precious metals form single particles.