Composition based on manganese and use for trapping NOx for treating exhaust gases
US6475452B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 9, 2000 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Aug 9, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2255/407
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to compositions of the NOx trap type. According to a first embodiment, the composition comprises a supported phase containing manganese and at least one other element selected from terbium, gadolinium, europium, samarium, neodymium and praseodymium and a support based on cerium oxide or a mixture of cerium oxide and zirconium oxide. According to a second embodiment, the composition comprises a supported phase and a support of the same type as for the first embodiment, and is characterized in that the manganese and the potassium are supplied by potassium permanganate. According to another embodiment, the composition consists essentially of manganese and of cerium oxide. These compositions can be used in a gas treatment process with a view to reducing nitrogen oxide emissions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.