US 12,129,182 B2
Nanocrystal-sized cerium-zirconium oxide material and method of making the same
Anatoly Bortun, Ypsilanti, MI (US); David Shepard, Canton, MI (US); Jin Cho, Utsunomiya (JP); Mila Bortun, Ypsilanti, MI (US); Yunkui Li, Ann Arbor, MI (US); Wei Wu, Ann Arbor, MI (US); and Jeffery Lachapelle, Northville, MI (US)
Assigned to Pacific Industrial Development Corporation, Ann Arbor, MI (US)
Filed by Pacific Industrial Development Corporation, Ann Arbor, MI (US)
Filed on Jun. 11, 2021, as Appl. No. 17/345,121.
Application 17/345,121 is a continuation of application No. PCT/US2019/069037, filed on Dec. 31, 2019.
Claims priority of provisional application 62/788,154, filed on Jan. 4, 2019.
Prior Publication US 2021/0300778 A1, Sep. 30, 2021
Int. Cl. C01G 25/00 (2006.01); B82Y 30/00 (2011.01); B82Y 40/00 (2011.01); F01N 3/10 (2006.01)
CPC C01G 25/006 (2013.01) [F01N 3/101 (2013.01); B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); C01P 2004/03 (2013.01); C01P 2004/45 (2013.01); C01P 2004/61 (2013.01); C01P 2004/62 (2013.01); C01P 2004/64 (2013.01); C01P 2006/12 (2013.01); C01P 2006/14 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A nanocrystal-sized cerium-zirconium mixed oxide material comprising
at least 30% by mass zirconium oxide;
between 5% to 55% by mass cerium oxide; and
a total of 25% or less by mass of at least one oxide of a rare earth metal selected from the group of lanthanum, neodymium, praseodymium, or yttrium;
wherein the nanocrystal-sized cerium-zirconium mixed oxide exhibits hierarchically ordered aggregates having a d50 particle size less than 1.5 μm and a total pore volume after calcination at a temperature of 600° C. or more that is at least 0.7 cm3/g;
wherein the nanocrystal-sized cerium-zirconium mixed oxide exhibits a specific surface area (SSA) and pore volume (PV) before and after aging at 1,000° C. or higher for at least 6 hours, such that the SSA and PV after aging is 75% or more of the SSA and PV before aging;
wherein the mixed oxide has a pore size distribution that remains unchanged over the temperature range from 600° C. to 1.100° C.