Catalyst for exhaust gas purification

Catalyst for exhaust gas purification

  • CN 101,157,032 B
  • Filed: 09/27/2007
  • Issued: 11/21/2012
  • Est. Priority Date: 10/05/2006
  • Status: Active Grant
First Claim
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1. exhaust gas purification catalyst is characterized in that possessing:

  • Help catalysis bag junctor, it is made up of particle that helps catalyst component and high-fire resistance oxide, wherein, helps the particle of catalyst component to be covered by the high-fire resistance oxide;

    Catalytic active species, its be supported at noble metal granule metal oxide formed by catalytic active particles around, dispose the metal oxide different metallic oxide with the said noble metal of load, and approaching with the said catalysis bag junctor that helps,Wherein, the said catalyst component that helps is to comprise at least a kind the oxide that is selected among Mn, Fe, Ni, Co, Cu and the Zn, and said high-fire resistance oxide comprises ZrO at least 2, and contain CeO more than 0 kind or a kind 2, Y 2O 3, La 2O 3, CaO and Nd 2O 3Perhaps, the said catalyst component that helps is to comprise at least a kind the oxide that is selected among Ce, La, Nd, Pr, Sm and the Dy, and said high-fire resistance oxide comprises Al at least 2O 3, and contain CeO more than 0 kind or a kind 2, Y 2O 3, La 2O 3And Nd 2O 3, Said noble metal is at least a kind that is selected among Pt, Pd, Rh, Au, Ag, Ir and the Ru,The metal oxide of the said noble metal granule of load is for being selected from Al 2O 3, CeO 2, ZrO 2, Y 2O 3, La 2O 3And Nd 2O 3In at least a kind, The metal oxide on every side that is disposed at said formed by catalytic active particles is for being selected from Al 2O 3, CeO 2, ZrO 2, Y 2O 3, La 2O 3And Nd 2O 3In at least a kind.

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