| 摘要 |
A catalyst 10 for purifying emission gas including a substrate 12, and on the substrate 12, a first catalyst layer 14 including a cerium oxide-zirconia based composite support supporting Pt or Pd, a second catalyst layer 16 including a support containing zirconia as a main component that supports Rh, and a diffusion barrier layer 18 interposed between the first catalyst layer 14 and the second catalyst layer 16 and containing metal oxide whose electronegativity is lower than that of Ce.
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