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Catalyst for purifying exhaust gas and method of producing same

  • US 5,814,576 A
  • Filed: 11/25/1996
  • Issued: 09/29/1998
  • Est. Priority Date: 11/27/1995
  • Status: Expired due to Term
First Claim
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1. A catalyst for purifying exhaust gas, comprising:

  • a monolithic carrier; and

    a catalyst component carrying layer formed on a surface of said monolithic carrier, said carrier component carrying layer includinga catalyst component including rhodium, anda catalyst component substrate for carrying the catalyst component, said catalyst component substrate including a composite oxide containing zirconium oxide and at least one element selected from the group consisting of magnesium, calcium, strontium, barium, yttrium and lanthanum, said composite oxide having a composition represented by the following general formula;

    
    
    space="preserve" listing-type="equation">X.sub.a Zr.sub.b O.sub.cwhere X is at least one element selected from the group consisting of magnesium, calcium, strontium, barium, yttrium and lanthanum; and

    a, b, and c, indicate atomic ratios, in which a is within a range of from 0.01 to 0.6 on the basis of b being 1.0 and c is a number which satisfies the valence of elements of the formula Xa Zrb Oc.

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