NO Oxidation Activity of Pseudo-brookite Compositions as Zero-PGM Catalysts for Diesel Oxidation Applications

• US 20170095794A1
• Filed: 10/01/2015
• Published: 04/06/2017
• Est. Priority Date: 10/01/2015
• Status: Abandoned Application

• Current Assignee: CDTi Advanced Materials, Inc.
• Original Assignee: Clean Diesel Technologies, Inc.
• Inventors: Nazarpoor, Zahra, Golden, Stephen J.
• Application Number:
  US14/873,045
• Publication Number:
  US 20170095794A1
• Time in Patent Office: Days
• CPC Class Codes: B01D 2255/204 Alkaline earth metals
• CPC Class Codes: B01D 2255/2061 Yttrium
• CPC Class Codes: B01D 2255/2065 Cerium
• CPC Class Codes: B01D 2255/20707 Titanium
• CPC Class Codes: B01D 2255/2073 Manganese
• CPC Class Codes: B01D 2255/20738 Iron
• CPC Class Codes: B01D 2255/20746 Cobalt
• CPC Class Codes: B01D 2255/20753 Nickel
• CPC Class Codes: B01D 2255/65 Catalysts not containing noble metals
• CPC Class Codes: B01D 2258/012 Diesel engines and lean burn gasoline engines
• CPC Class Codes: B01D 53/944 Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts three-way-catalysts [TWC] B01D53/9445
• CPC Class Codes: B01J 23/002 Mixed oxides other than spinels, e.g. perovskite
• CPC Class Codes: B01J 23/34 Manganese
• CPC Class Codes: B01J 23/83 with rare earths or actinides
• CPC Class Codes: B01J 23/8892 Manganese
• CPC Class Codes: B01J 2523/00 Constitutive chemical elements of heterogeneous catalysts
• CPC Class Codes: B01J 2523/24 Strontium
• CPC Class Codes: B01J 2523/36 Yttrium
• CPC Class Codes: B01J 2523/3712 Cerium
• CPC Class Codes: B01J 2523/47 Titanium
• CPC Class Codes: B01J 2523/72 : Manganese
• CPC Class Codes: B01J 2523/842 : Iron
• CPC Class Codes: B01J 2523/845 : Cobalt
• CPC Class Codes: B01J 2523/847 : Nickel
• CPC Class Codes: B01J 6/001 : Calcining

Abstract

Zero-PGM (ZPGM) catalyst materials including pseudo-brookite compositions for use in diesel oxidation catalyst (DOC) applications are disclosed. The disclosed doped pseudo-brookite compositions include A-site partially doped pseudo-brookite compositions, such as, Sr-doped and Ce-doped pseudo-brookite compositions, as well as B-site partially doped pseudo-brookite compositions, such as, Fe-doped, Co-doped, Ni-doped, and Ti-doped pseudo-brookite compositions. The disclosed doped pseudo-brookite compositions, including calcination at various temperatures, are subjected to a DOC standard light-off (LO) test methodology to assess/verify catalyst activity as well as to determine the effect of the use of a dopant in an A-site cation or a B-site cation within a pseudo-brookite composition. The disclosed doped pseudo-brookite compositions exhibit higher NO oxidation catalyst activities when compared to bulk powder pseudo-brookite, thereby indicating improved thermal stability and catalyst activity when using a dopant in an A-site cation or in a B-site cation within a pseudo-brookite composition.

Claims

1. A catalyst composition comprising a pseudo-brookite structured compound of general formula Y_1-xA_xMn_2-yB_yO₅, wherein the pseudo-brookite structured compound includes yttrium and manganese, wherein at least one selected from the group consisting of x and y is greater than 0, and wherein A and B are cations selected from the group consisting of cerium (Ce), strontium (Sr), iron (Fe), cobalt (Co), nickel (Ni), and titanium (Ti).

2. The catalyst composition of claim 1, wherein A is a cation selected from the group consisting of Ce and Sr, and wherein x is about 0.01 to about 0.5.

3. The catalyst composition of claim 2, wherein x is about 0.1.

4. The catalyst composition of claim 2, wherein A is Ce.

5. The catalyst composition of claim 2, wherein A is Sr.

6. The catalyst composition of claim 2, wherein the catalyst composition is calcined at a temperature from about 800°

C. to about 1000°

C.

7. The catalyst composition of claim 1, wherein B is a cation selected from the group consisting of Fe, Co, Ni, and Ti, and wherein y is about 0.1 to about 0.5.

8. The catalyst composition of claim 7, wherein y is about 0.1.

9. The catalyst composition of claim 7, wherein B is a cation selected from the group consisting of Fe, Co, and Ti, and wherein the catalyst composition is calcined at a temperature of about 1000°

C.

10. The catalyst composition of claim 7, wherein B is Fe.

11. The catalyst composition of claim 7, wherein B is Co.

12. The catalyst composition of claim 7, wherein B is Ti.

13. The catalyst composition of claim 7, wherein B is Ni.

14. The catalyst composition of claim 13, wherein the catalyst composition is calcined at a temperature of about 800°

C.

15. The catalyst composition of claim 7, wherein the catalyst composition is calcined at a temperature from about 800°

C. to about 1000°

C.

16. The catalyst composition of claim 1, wherein the catalyst composition is calcined at a temperature from about 800°

C. to about 1000°

C.

17. The catalyst composition of claim 1, wherein A is a cation selected from the group consisting of Ce and Sr, wherein B is a cation selected from the group consisting of Fe, Co, Ni, and Ti, wherein x is greater than 0, and wherein y is greater than 0.

18. The catalyst composition of claim 17, wherein x is about 0.01 to about 0.5.

19. The catalyst composition of claim 17, wherein y is about 0.01 to about 0.5.

20. The catalyst composition of claim 18, wherein y is about 0.01 to about 0.5.