Exhaust gas purification catalyst device
AssigneeCataler Corporation
InventorsShunsuke Oishi, Naruya Inada, Ryoichi Ogawa
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Abstract
An gas purification catalyst device having a catalyst coated layer formed on at least one base material, wherein: the catalyst coated layer includes a first catalyst coated layer on the upstream side of an exhaust gas flow, and a second catalyst coated layer on the downstream side of the exhaust gas flow; the first catalyst coated layer includes a hydrocarbon adsorbent and a catalytic precious metal; and the second catalyst coated layer includes a nitrogen oxide adsorbent and a catalytic precious metal.
Claims20
An exhaust gas purification catalyst device having a catalyst coating layer formed on at least one substrate, wherein:
- the catalyst coating layer contains a first catalyst coating layer on an exhaust gas flow upstream side and a second catalyst coating layer on an exhaust gas flow downstream side,
- the first catalyst coating layer contains a hydrocarbon adsorbent and a catalyst noble metal,
- the second catalyst coating layer contains a nitrogen oxide adsorbent and a catalyst noble metal, and
- the nitrogen oxide adsorbent comprises a spinel selected from the group consisting of magnesium aluminate (MgAl2O4), iron spinel (FeAl2O4), zinc spinel (ZnAl2O4), manganese spinel (MnAl2O4), and La—Ce—Al—Mg composite oxides.
Dependencies are inferred from the claim text.