Zirconia-based compositions for use in passive NOx adsorber devices
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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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.
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19 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- 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;
Specification