Promoter metal containing perovskite-type compound for gasoline exhaust gas applications

Patent metadata

Field	Value
Publication number	US-2020179908-A1
Application number	US-201916701313-A
Country	US
Kind code	A1
Filing date	Dec 3, 2019
Priority date	Dec 4, 2018
Publication date	Jun 11, 2020
Grant date	—

Abstract

A three-way catalyst composition, and its use in an exhaust system for internal combustion engines, is disclosed. The composition can comprise a compound of formula (I): Ax-yA′yB1-zB′zO3 and a promoter metal component, wherein A is an ion of a metal of group 2 or 3 of the periodic table of elements; wherein A′ is an ion of a metal of group 1, 2, or 3 of the periodic table of elements; wherein B and B′ are ions of metal of groups 4, 6, 7, 8, 9, 10, 11, or 13 of the periodic table of elements; wherein x is from 0.7 to 1; wherein y is from 0 to 0.5; and wherein z is from 0 to 0.5.

First claim

1 . A composition comprising a perovskite type compound of formula (I): A x-y A′ y B 1-z B′ z O 3 and a promoter metal component, wherein A is an ion of a metal of group 2 or 3 of the periodic table of elements; wherein A′ is an ion of a metal of group 1, 2, or 3 of the periodic table of elements; wherein B and B′ are ions of metal of groups 4, 6, 7, 8, 9, 10, 11, or 13 of the periodic table of elements; wherein x is from 0.7 to 1; wherein y is from 0 to 0.5; and wherein z is from 0 to 0.5.

2 . The composition of claim 1 , wherein A is Y, La, Nd, Ce, or Gd.

3 . The composition of claim 2 , wherein A is La or Y.

4 . The composition of claim 1 , wherein A′ is Sr, Ca, Y, or Ce.

5 . The composition of claim 1 , wherein B is Mn, Co, Fe, or Ni.

6 . The composition of claim 5 , wherein B is Mn or Fe.

7 . The composition of claim 6 , wherein B is Fe.

8 . The composition of claim 1 , wherein B′ is Mn, Fe, Ni, Co, or Cu.

9 . The composition of claim 8 , wherein B′ is Cu.

10 . The composition of claim 1 , wherein x is from 0.8 to 1.

11 . The composition of claim 1 , wherein y is from 0 to 0.4.

12 . (canceled)

13 . The composition of claim 1 , wherein z is from 0 to 0.4.

14 . (canceled)

15 . The composition of claim 1 , wherein the specific surface area of the compound of formula (I) is at least 8 m 2 /g.

16 . The composition of claim 1 , wherein the compound of formula (I) has a mean primary crystal size of less than 60 nm as evidenced by XRD.

17 . The composition of claim 1 , wherein the compound of formula (I) is at least 90% phase pure.

18 . The composition of claim 1 , wherein the compound of formula (I) has a spherical shape morphology.

19 . The composition of claim 1 , wherein the compound of formula (I) has a surface composition range of (A+A′)/(B+B′) between 0.5 and 3.0.

20 . The composition of claim 1 , wherein the promoter metal component is Cu, Mn, Co, Ni, or Fe.

21 . The composition of claim 20 , wherein the promoter metal component is Cu.

22 . The composition of claim 1 , wherein the promoter metal component is up to 20 wt % of the composition, based on the promoter metal element content.

23 . (canceled)

Assignees

• Johnson Matthey Plc

Inventors

• Simmance Kerry
• Thompsett David

Classifications

• B01J35/45

  Nanoparticles · CPC title

• B01J35/393 Primary

  Metal or metal oxide crystallite size · CPC title

• B01J35/733

  Perovskite-type · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J35/51

  Spheres · CPC title