Manganese-based oxides promoted lean NOx trap (LNT) catalyst
US8959894B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 2011 |
| Grant date | Feb 24, 2015 |
| Priority date | — |
| Expiry date | Dec 25, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
MnOx-containing, base-metal oxide mixtures (e.g., MnOx—CeO2) are useful NOx oxidation catalyst materials and NOx storage materials in lean-burn engine exhaust gas treatments using Lean NOx Trap (LNT) systems. These oxidation catalyst materials are used in combination with a NOx storage material and a NOx reduction material. MnOx-containing oxide mixtures can replace platinum (Pt) in LNT systems where the exhaust of the engine is repeatedly varied between a relatively long fuel-lean mode of operation and a relatively short fuel-rich mode of operation. The combination of the MnOx oxidation catalyst, NOx storage material, and NOx reduction catalyst material serves to complete the oxidation of unburned hydrocarbons and carbon monoxide, and to convert NOx to nitrogen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.