	US 11,872,540 B2
	Exhaust gas purification catalyst composition and exhaust gas purification catalyst
Ryo Takeuchi, Saitama (JP); Hironori Iwakura, Saitama (JP); Shogo Sano, Saitama (JP); and Yusuke Hosoi, Saitama (JP)
Assigned to MITSUI MINING & SMELTING CO., LTD., Tokyo (JP)
Appl. No. 17/780,400
Filed by MITSUI MINING & SMELTING CO., LTD., Tokyo (JP)
PCT Filed Nov. 27, 2020, PCT No. PCT/JP2020/044288 § 371(c)(1), (2) Date May 26, 2022, PCT Pub. No. WO2021/107119, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 2019-215452 (JP), filed on Nov. 28, 2019.
Prior Publication US 2022/0401923 A1, Dec. 22, 2022
Int. Cl. B01J 23/10 (2006.01); B01D 53/86 (2006.01); B01J 21/06 (2006.01); B01J 23/38 (2006.01)

CPC B01J 23/10 (2013.01) [B01D 53/864 (2013.01); B01D 53/8628 (2013.01); B01J 21/066 (2013.01); B01J 23/38 (2013.01)]

15 Claims

1. A composition, comprising:

a pyrochlore-type CeO₂—ZrO₂-based complex oxide comprising Y and Mg; and

a catalytically-active component comprising a noble metal element,

wherein, in the pyrochlore-type CeO₂—ZrO₂-based complex oxide, a mole percentage R₂of a total content of Y and Mg to a total content of Ce, Zr, Y and Mg is 5.5% by mole or more and 20% by mole or less, and a mole ratio R₃of a content of Mg to a content of Y is 0.1 or more and 2.6 or less, and

wherein the composition is a composition for producing an exhaust gas purification catalyst comprising the pyrochlore-type CeO₂—ZrO₂-based complex oxide, and the catalytically-active component supported on the pyrochlore-type CeO₂—ZrO₂-based complex oxide.