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ZIRCONIA-BASED COMPOSITIONS FOR USE IN PASSIVE NOx ADSORBER DEVICES

  • US 20190308164A1
  • Filed: 04/05/2018
  • Published: 10/10/2019
  • Est. Priority Date: 04/05/2018
  • Status: Active Grant
First Claim
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1. A passive NOX adsorbent comprising:

  • palladium, platinum or a mixture thereof and a mixed or composite oxide comprising 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 lanthanide series element other than Ce, comprising Pr; and

    a transition metal comprising at least one of the following metals selected from W, Mn, and Fe.

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