Synergistic combinations of low temperature NOx adsorbers
US10145281B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2016 |
| Grant date | Dec 4, 2018 |
| Priority date | — |
| Expiry date | Aug 5, 2036 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Nitrogen oxides (NOx), carbon monoxide (CO), and residual hydrocarbons are adsorbed and stored from a low temperature, cold-start, diesel engine (or lean-burn gasoline engine) exhaust stream by a combination of a silver-based (Ag/Al2O3) NOx adsorber material and a zeolite-platinum group metal (zeolite-PGM) adsorber material for low temperature temporary storage of the NOx. The combination of NOx adsorber materials is formed as separate washcoats on channel walls of an extruded flow-through monolithic support. The monolith is located near the exhaust manifold of the lean burn engine where the combination of NOx adsorber particles temporarily adsorb exhaust constituents, and commence oxidation of them, until the progressively warming exhaust stream removes the stored constituents and carries them through the exhaust pipe to downstream NOx reduction converters which have been heated to their operating temperatures and complete the conversion of the NOx constituents to nitrogen and water for discharge from the vehicle's exhaust system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.