Emissions reduction system
US9657626B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 2015 |
| Grant date | May 23, 2017 |
| Priority date | — |
| Expiry date | Jun 4, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An exhaust system for a diesel engine is disclosed. The exhaust system may include a diesel oxidation catalyst (DOC) configured to receive exhaust gases from the engine and oxidize hydrocarbons in the exhaust gases and a passive NOx adsorber (PNA) downstream from the DOC and configured to store NOx from the exhaust gases at temperatures up to 150° C. A selective catalytic reduction (SCR) system may be downstream from the PNA and configured to reduce NOx in the exhaust gases. The PNA may be configured to release the stored NOx at temperatures above 200° C. The DOC upstream of the PNA may reduce the amount of N2O that is generated by the PNA by oxidizing hydrocarbons before they reach the PNA.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.