Selective catalytic reduction filter devices having NOx storage capabilities
US10138779B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Nov 14, 2016 |
| Grant date | Nov 27, 2018 |
| Priority date | — |
| Expiry date | Dec 18, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Selective catalytic reduction filter (SCRF) devices and systems incorporating the same are provided. Systems can include an exhaust gas source, an exhaust gas conduit capable of receiving an exhaust gas stream from the exhaust gas source, and an SCRF device in fluid communication therewith. The SCRF device can include a filter, a selective catalytic reduction (SCR) catalyst disposed on at least portion of the filter, and a NOx storage coating on at least a portion of the filter. The NOx storage coating can include one or more of palladium, barium, or cerium. The NOx storage coating can be biased towards the upstream side of the filter. The NOx storage coating can overlap a portion of the SCR catalyst. The system can further include a water-absorbing alkali oxide. The water-absorbing alkali oxide can be disposed within the SCRF device, the exhaust gas conduit, or in an upstream oxidation catalyst device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.