Coated perovskite-based catalysts, catalyst combinations and methods of treating a gas stream
US8226915B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2010 |
| Grant date | Jul 24, 2012 |
| Priority date | — |
| Expiry date | Jan 28, 2031 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J23/8892
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
One embodiment of the invention includes a method of treating a gas stream comprising flowing the gas stream over a hydrocarbon reduction and NOx reduction catalyst first, and thereafter flowing the gas over a perovskite and NOx trap material for NOx oxidation and storage. In one embodiment, the hydrocarbon reduction and NOx reduction catalyst may include palladium. In one embodiment, the perovskite catalyst may have the general formula ABO3, AA′BO3, ABB′O3, or AA′BB′O3. The perovskite catalyst may be the only catalyst or a second non-perovskite catalyst may include at least one of palladium, platinum, rhodium, ruthenium or a catalyst system including one or more of the same or alloys thereof. In one embodiment, the NOx trap material may include at least one of alkali metals, alkaline earth metals such as barium, calcium, potassium, or sodium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.