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Exhaust gas purification catalyst

  • US 9,415,383 B2
  • Filed: 05/25/2011
  • Issued: 08/16/2016
  • Est. Priority Date: 06/07/2010
  • Status: Active Grant
First Claim
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1. An exhaust gas purification catalyst, comprising:

  • a catalytic layer containing a particle component A and a particle component B on a carrier,wherein the particle component A is composed of catalytic-metal-doped CeZr-based mixed oxide powder in which catalytic metal is solid-dissolved in CeZr-based mixed oxide,the particle component B is composed of activated alumina powder, which has a number-average particle size of equal to or greater than 5 μ

    m and equal to or less than 30 μ

    m,Zr—

    La mixed oxide-supported alumina powder in which Zr—

    La mixed oxide is supported on activated alumina particles, which has a number-average particle size of equal to or greater than 10 μ

    m and equal to or less than 50 μ

    m, andCeZr-based mixed oxide powder in which catalytic metal is not solid-dissolved, which has a number-average particle size of equal to or greater than 0.5 μ

    m and equal to or less than 5.0 μ

    m,the particle component A has a particle size distribution with a peak in a particle size range of equal to or greater than 100 nm and equal to or less than 300 nm, and has a CeO2 amount of equal to or greater than 30% by mass and equal to or less than 75% by mass in a total amount of CeO2 and ZrO2, andthe particle components A and B are mixed such that the particle component A is at least partially interposed between particles of the particle component B in the catalytic layer.

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