	US 12,214,333 B2
	Mixed oxide based on cerium and zirconium
Simon Ifrah, La Jarrie (FR); Rui Jorge Coelho Marques, Shanghai (CN); Wei Li, Shanghai (CN); and Ling Zhu, Jiangsu (CN)
Assigned to RHODIA OPERATIONS, Lyons (FR)
Appl. No. 17/627,151
Filed by RHODIA OPERATIONS, Aubervilliers (FR)
PCT Filed Jul. 15, 2020, PCT No. PCT/CN2020/102176 § 371(c)(1), (2) Date Jan. 14, 2022, PCT Pub. No. WO2021/013016, PCT Pub. Date Jan. 28, 2021.
Prior Publication US 2022/0297091 A1, Sep. 22, 2022
Int. Cl. B01J 23/10 (2006.01); B01D 53/94 (2006.01); B01J 35/50 (2024.01); B01J 35/56 (2024.01); B01J 35/61 (2024.01); B01J 35/63 (2024.01); B01J 37/00 (2006.01); B01J 37/03 (2006.01); B01J 37/04 (2006.01); B01J 37/08 (2006.01); C01G 25/00 (2006.01)

CPC B01J 23/10 (2013.01) [B01D 53/945 (2013.01); B01J 35/50 (2024.01); B01J 35/56 (2024.01); B01J 35/613 (2024.01); B01J 35/635 (2024.01); B01J 35/638 (2024.01); B01J 37/0018 (2013.01); B01J 37/0027 (2013.01); B01J 37/031 (2013.01); B01J 37/04 (2013.01); B01J 37/088 (2013.01); C01G 25/006 (2013.01); B01D 2255/102 (2013.01); B01D 2255/2061 (2013.01); B01D 2255/2063 (2013.01); B01D 2255/2065 (2013.01); B01D 2255/20715 (2013.01); B01D 2255/2092 (2013.01); B01D 2255/407 (2013.01); B01D 2255/9155 (2013.01); B01D 2255/9207 (2013.01); C01P 2002/52 (2013.01); C01P 2004/61 (2013.01); C01P 2006/12 (2013.01); C01P 2006/14 (2013.01); C01P 2006/22 (2013.01)]

34 Claims

1. A mixed oxide comprising zirconium, cerium, lanthanum and optionally at least one rare earth element other than cerium and other than lanthanum (RE) with the following proportion:

between 8.0% and 45.0% by weight of cerium;

between 1.0% and 15.0% by weight of lanthanum;

up to 15.0% by weight of the at least one rare earth element other than cerium and other than lanthanum;

the total proportion of lanthanum and the at least one rare earth element(s) other than cerium and other than lanthanum being lower than or equal to 25.0%;

the remainder as zirconium;

the proportions of the cerium, zirconium, lanthanum, and RE being given by weight of oxide relative to the mixed oxide as a whole,

the mixed oxide exhibiting the following properties after calcination in air at 1100° C. for 4 hours:

a specific surface area (S_{1100° C./4 h}) between 25 m²/g and 50 m²/g;

a pore volume (PV_{0-300 nm}) determined by mercury porosimetry for pores having a diameter below 300 nm between 0.50 cm³/g and 0.90 cm³/g;

the mixed oxide being in the form of particles with the following properties:

a d50 between 1.0 μm and 2.5 μm;

a d90 between 2.0 μm and 9.0 μm

wherein the above mentioned elements are present in the mixed oxide as oxides.