US Patent Number
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.
Magnesium Elektron Ltd., Manchester (GB); The University of Kentucky Research Foundation, Lexington, KY (US)
Harris, Deborah Jayne; Scapens, David Alastair; Darab, John G.; Crocker, Mark; and Ji, Yaying, "Zirconia-Based Compositions for Use in Passive NOx Adsorber Devices" (2019). Chemistry Faculty Patents. 41.