Methods for treating engine exhaust
US9339800B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 2015 |
| Grant date | May 17, 2016 |
| Priority date | — |
| Expiry date | Jul 22, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for treating engine exhaust. The method includes contacting an NOx exhaust with an upstream catalyst material coated onto a substrate and including copper or iron loaded in a first zeolite at an upstream loading of 0 to 3.5 g/l to convert the NOx exhaust in a first temperature range of 150° C. to 500° C. to a first NOx converted exhaust. The method further includes contacting the first NOx converted exhaust with a downstream catalyst material coated onto the substrate downstream of the upstream catalyst material and including copper or iron loaded in a second zeolite at a downstream loading of 1.5 to 9.5 g/l to convert the first NOx converted exhaust in a second temperature range of 450° C. to 700° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.