Cerium-Cobalt Spinel System as ZPGM Composition for DOC Applications

Patent metadata

Field	Value
Publication number	US-2016263561-A1
Application number	US-201514657833-A
Country	US
Kind code	A1
Filing date	Mar 13, 2015
Priority date	Mar 13, 2015
Publication date	Sep 15, 2016
Grant date	—

Abstract

Variations of ZPGM catalyst material compositions including cerium-cobalt spinel oxide systems for ZPGM DOC applications are disclosed. The disclosed ZPGM catalyst compositions include Ce x Co 3−x O 4 spinel and effect of adding copper to Ce-Co as Cu x Ce 1−x Co 2 O 4 spinel systems supported on doped zirconia support oxide, which are produced by the incipient wetness (IW) methodology. ZPGM catalyst compositions are subjected to BET-surface area and XRD analyses to determine the thermal stability and spinel phase formation of supported spinal systems, respectively. DOC performance of ZPGM catalyst compositions is determined under steady state DOC light off test condition to verify/compare oxidation activity of disclosed spinel compositions, desirable and suitable for ZPGM catalyst materials in DOC applications.

First claim

What is claimed is:

1 . A catalytic system, comprising:
a substrate; a washcoat suitable for deposition on the substrate; and an overcoat suitable for deposition on the substrate, the overcoat comprising a catalyst comprising a spinel having the general formula Ce x Co 3−x Co 4 , where x=0.2 to 1.5.

2 . The system of claim 1 , wherein the spinel has the formula CeCo 2 O 4 .

3 . The system of claim 1 , wherein the oxide powder comprising Ce 0.75 Zr 0.5 O 2 .

4 . The system of claim 1 , wherein CO is oxidized by the catalyst.

5 . The system of claim 1 , wherein hydrocarbons are oxidized by the catalyst.

6 . The system of claim 1 , wherein NO oxidation occurs at about 275° C.

7 . The system of claim 1 , wherein NO oxidation occurs between about 275° C. and about 375° C.

8 . The system of claim 1 , wherein NO conversion is greater than 60%.

9 . The system of claim 1 , wherein NO conversion is greater than 67%.

10 . A catalyst, comprising: a spinel having the general formula Ce x Co 3−x O 4 , where x=0.2 to 1.5.

11 . The catalyst of claim 10 , wherein the spinel has the formula CeCo 2 O 4 .

12 . The catalyst of claim 10 , wherein the oxide powder comprising Ce 0.75 Zr 0.5 O 2 .

13 . The catalyst of claim 10 , wherein CO is oxidized by the catalyst.

14 . The catalyst of claim 10 , wherein hydrocarbons are oxidized by the catalyst.

15 . The catalyst of claim 10 , wherein NO oxidation occurs at about 275° C.

16 . The catalyst of claim 10 , wherein NO oxidation occurs between about 275° C. and about 375° C.

17 . The catalyst of claim 10 , wherein NO conversion is greater than 60%.

18 . The catalyst of claim 10 , wherein NO conversion is greater than 67%.

19 . A catalyst, comprising: a spinel having the general formula Cu x Ce 1−x Co 2 O 4 , where x=0.01 to 0.99.

20 . The catalyst of claim 19 , wherein the spinel has the formula Cu 0.5 Ce 0.5 Co 2 O 4 .

21 . The catalyst of claim 19 , wherein the oxide powder comprising Ce 0.75 Zr 0.5 O 2 .

22 . The catalyst of claim 19 , wherein CO is oxidized by the catalyst.

23 . The catalyst of claim 1 , wherein hydrocarbons are oxidized by the catalyst.

24 . The catalyst of claim 19 , wherein CO oxidation occurs at about 275° C.

25 . The catalyst of claim 19 , wherein NO conversion is greater than 90%.

Assignees

• Clean Diesel Tech Inc

Inventors

• Nazarpoor Zahra
• Golden Stephen J

Classifications

• B01J2235/15

  X-ray diffraction · CPC title

• B01J35/70

  characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00) · CPC title

• B01J23/005

  Spinels · CPC title

• B01J23/83 Primary

  with rare earths or actinides · CPC title

• B01J35/02

  Operations & Transport · mapped topic