EXHAUST GAS PURIFICATION CATALYST DEVICE
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United States of America Patent
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Nov 30, 2023
app pub date -
Oct 21, 2021
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Nov 6, 2020
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Abstract
An exhaust gas purification catalyst device having a base material, an upstream-side lower coat layer, an upstream-side upper coat layer, a downstream-side lower coat layer, and a downstream-side upper coat layer, the exhaust gas purification catalyst device satisfying conditions (i) and (ii). (i) The concentration of Pt and/or Pd in the upstream-side upper coat layer and the downstream-side lower coat layer is greater than the concentration of Pt and/or Pd in the upstream-side lower coat layer, and is greater than the concentration of Pt and/or Pd in the downstream-side upper coat layer. (ii) The concentration of Rh in the upstream-side lower coat layer and the downstream-side upper coat layer is greater than the concentration of Rh in the upstream-side upper coat layer, and is greater than the concentration of Rh in the downstream-side lower coat layer.
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