Exhaust system with a modified lean NOx trap
US10119445B2 · kind B2 · utility
0Cited by
7References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 16, 2014 |
| Grant date | Nov 6, 2018 |
| Priority date | — |
| Expiry date | Sep 16, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An exhaust system for treating an exhaust gas from an internal combustion engine is disclosed. The system comprises a modified lean NOx trap (LNT), a urea injection system, and an ammonia-selective catalytic reduction (NH3-SCR) catalyst. The modified LNT comprises platinum, palladium, barium, and a ceria-containing material, and has a platinum:palladium molar ratio of at least 3:1. The modified LNT stores NOx at temperatures below about 200° C. and releases the stored NOx at temperatures above about 200° C. The urea injection system injects urea at temperatures above about 180° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.