Non-stoichiometric perovskite oxide oxidation catalyst for oxidizing NO to NO2
US8765092B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 25, 2012 |
| Grant date | Jul 1, 2014 |
| Priority date | — |
| Expiry date | Nov 14, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01N3/0231
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A non-stoichiometric perovskite oxide having the general chemical formula LaXMnOY, in which the molar ratio of lanthanum to manganese (“X”) ranges from 0.85 to 0.95, can be used in particle form as an oxidation catalyst to oxidize NO to NO2 in an exhaust aftertreatment system for a hydrocarbon-fueled engine. The oxygen content (“Y”) fluctuates with variations in the molar ratio of lanthanum to manganese but generally falls somewhere in the range of 3.0 to 3.30. The crystal lattice adjustments spurred by the non-stoichiometric molar ratio of lanthanum to manganese are believed responsible for an enhanced NO oxidative activity relative to similar perovskite oxides with a higher molar ratio of lanthanum and manganese.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.