Zirconia-based compositions for use in passive NOx adsorber devices
US10500562B2 · kind B2 · utility
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Key dates
| Filing date | Apr 5, 2018 |
| Grant date | Dec 10, 2019 |
| Priority date | — |
| Expiry date | Apr 5, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2257/404
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A passive NOX adsorbent includes: palladium, platinum or a mixture thereof and a mixed or composite oxide including the following elements in percentage by weight, expressed in terms of oxide: 10-90% by weight zirconium and 0.1-50% by weight of least one of the following: a transition metal or a lanthanide series element other than Ce.Although the passive NOX adsorbent can include Ce in an amount ranging from 0.1 to 20% by weight expressed in terms of oxide, advantages are obtained particularly in the case of low-Ce or a substantially Ce-free passive NOx adsorbent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.