Stability of Doped-Zirconia as Support Oxide for Copper-Manganese Zero-PGM Catalysts

Patent metadata

Field	Value
Publication number	US-2017095802-A1
Application number	US-201514872972-A
Country	US
Kind code	A1
Filing date	Oct 1, 2015
Priority date	Oct 1, 2015
Publication date	Apr 6, 2017
Grant date	—

Abstract

The present disclosure describes bulk powder Zero-PGM material compositions including a CuMn 2 O 4 spinel structure supported on doped zirconia support oxides powders, including Ba, Sr, and Ti at different dopant loadings produced by different conventional synthetic methods. BET-surface area and XRD analysis are performed for a plurality of doped zirconia support oxides to compare the thermal stability, before and after deposition of Cu—Mn spinel. Additionally, bulk powder ZPGM catalyst compositions are subjected to a steady-state isothermal sweep test to determine NO conversion capabilities. The selected support oxide material compositions are capable of providing increased surface areas for improved thermal stability leading to a more effective utilization of ZPGM catalyst materials with enhanced NO conversion and improved thermal stability for TWC applications.

First claim

What is claimed is:

1 . A support oxide for a catalytic composition, comprising a zirconia doped by at least one selected from the group consisting of Ba, Sr, and Ti.

2 . The support oxide of claim 1 , wherein the zirconia is doped by Ba to form a BaO—ZrO 2 support oxide.

3 . The support oxide of claim 2 , wherein the BaO—ZrO 2 support oxide comprises about 0.5% to about 50% by weight BaO.

4 . The support oxide of claim 3 , wherein the BaO—ZrO 2 support oxide comprises about 5% to about 10% by weight BaO.

5 . The support oxide of claim 3 , wherein the BaO—ZrO 2 support oxide comprises about 5% by weight BaO.

6 . The support oxide of claim 1 , wherein the zirconia is doped by Sr to form a SrO—ZrO 2 support oxide.

7 . The support oxide of claim 6 , wherein the SrO—ZrO 2 support oxide comprises about 0.5% to about 50% by weight SrO.

8 . The support oxide of claim 7 , wherein the SrO—ZrO 2 support oxide comprises about 5% to about 10% by weight SrO.

9 . The support oxide of claim 7 , wherein the SrO—ZrO 2 support oxide comprises about 5% by weight SrO.

10 . The support oxide of claim 7 , wherein the SrO—ZrO 2 support oxide comprises about 10% by weight SrO.

11 . A catalytic composition comprising a ZPGM catalyst and at least one support oxide including a zirconia doped by at least one selected from the group consisting of Ba, Sr, and Ti.

12 . The catalytic composition of claim 11 wherein the ZPGM catalyst includes a Cu—Mn spinel.

13 . The support oxide of claim 11 , wherein the zirconia is doped by Ba to form a BaO—ZrO 2 support oxide, wherein the BaO—ZrO 2 support oxide comprises about 0.5% to about 50% by weight BaO.

14 . The support oxide of claim 12 , wherein the zirconia is doped by Ba to form a BaO—ZrO 2 support oxide, and wherein the BaO—ZrO 2 support oxide comprises about 0.5% to about 50% by weight BaO.

15 . The support oxide of claim 13 , wherein the BaO—ZrO 2 support oxide comprises about 5% to about 10% by weight BaO.

16 . The support oxide of claim 14 , wherein the BaO—ZrO 2 support oxide comprises about 5% by weight BaO.

17 . The support oxide of claim 11 , wherein the zirconia is doped by Sr to form a SrO—ZrO 2 support oxide, and wherein the SrO—ZrO 2 support oxide comprises about 0.5% to about 50% by weight SrO.

18 . The support oxide of claim 12 , wherein the zirconia is doped by Sr to form a SrO—ZrO 2 support oxide, and wherein the SrO—ZrO 2 support oxide comprises about 0.5% to about 50% by weight SrO.

19 . The support oxide of claim 17 , wherein the SrO—ZrO 2 support oxide comprises about 5% to about 10% by weight SrO.

20 . The support oxide of claim 18 , wherein the SrO—ZrO 2 support oxide comprises about 5% to about 10% by weight SrO.

Assignees

• Clean Diesel Tech Inc

Inventors

• Nazarpoor Zahra
• Golden Stephen J

Classifications

• B01J35/70

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

• B01J2235/15

  X-ray diffraction · CPC title

• B01J35/30

  characterised by their physical properties · CPC title

• B01J23/02

  of the alkali- or alkaline earth metals or beryllium · CPC title

• B01J21/066

  Zirconium or hafnium; Oxides or hydroxides thereof · CPC title