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Mixed-phase ceramic oxide three-way catalyst formulations and methods for preparing the catalysts

  • US 7,641,875 B1
  • Filed: 11/03/2008
  • Issued: 01/05/2010
  • Est. Priority Date: 11/15/2000
  • Status: Expired due to Fees
First Claim
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1. A multi-phase catalyst for simultaneous conversion of oxides of nitrogen, carbon monoxide, and hydrocarbons represented by the general formula:


  • CeyLn1-xAx+sMOz,wherein;

    A is an element selected from the group consisting of Mg, Ca, Sr, Ba, Li, Na, K, Cs, Rb, and any combination thereof;

    Ln is a mixture of elements originally in the form of single-phase mixed lanthanides collected from natural ores, a single lanthanide, or a mixture of artificial lanthanides;

    M is an element selected from the group consisting of Fe, Mn, Cr, Ni, Co, Cu, V, Zr, Pt, Pd, Rh, Ru, Ag, Au, Al, Ga, Mo, W, Ti, and any combination thereof;

    x is a number defined by 0≦

    x<

    1.0;

    y is a number defined by 0≦

    y<

    10;

    s is a number defined by 0≦

    s<

    10; and

    z is a number defined by z>

    0,where s=0 only when y>

    0 and y=0 only when s>

    0.

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