Catalytic converter
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United States of America Patent
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Jan 23, 2018
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app pub date -
Mar 1, 2017
filing date -
Apr 13, 2016
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Abstract
A catalytic converter with excellent OSC performance and Nox purification performance. The catalytic converter includes a substrate with a cell structure and a catalyst layer formed on a cell wall surface of the substrate. The catalyst layer has a catalyst layer arranged on the upstream side and a catalyst layer arranged on the downstream side in an exhaust gas flow direction on the substrate. The catalyst layer on the upstream side includes a support containing an Al2O3—CeO2—ZrO2 ternary composite oxide (ACZ material) and an Al2O3—ZrO2 binary composite oxide (AZ material), and at least Rh that is a noble metal catalyst carried on the support, and the catalyst layer on the downstream side includes a support and Pd or Pt that is a noble metal catalyst carried on the support. In the support in the catalyst layer on the upstream side, the mass proportion of ACZ material/(ACZ material+AZ material) is in the range of 0.33 to 0.5, and greater than or equal to 75% mass Rh is carried on the Al2O3—ZrO2 binary composite oxide of the support.
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