Catalyst support materials with oxygen storage capacity (OSC) and method of making thereof
US9597666B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 2016 |
| Grant date | Mar 21, 2017 |
| Priority date | — |
| Expiry date | Jun 10, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A wash coat is formed by combining platinum group metals (PGM) and an adhesive with a mixture of catalyst support materials according to the relationship (α)RE-Ce—ZrO2+(β)CZMLA+(1−α−β)RE-Al2O3. The RE-Ce—ZrO2 is a commercial material of rare earth elements stabilized ceria zirconia having a weight ratio (α) ranging from 0 to about 0.7; CZMLA is a catalyst support material comprising a core support powder coated with a solid solution and has a weight ratio (β) ranging from about 0.2 to about 1 such that (α+β)≦1. RE-Al2O3 is rare earth element stabilized alumina having a weight ratio equal to (1−α−β). The wash coat exhibits a lower activation temperature compared with traditional wash coat formulations by at least 50° C. This wash coat also requires less RE-Ce—ZrO2 oxide and/or less PGM in the formulation for use as an emission control catalyst for gasoline and diesel engines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.