Metal oxide catalytic compositions having perovskite crystal structures and containing metals of the platinum group
Patent 4049583 Issued on September 20, 1977. Estimated Expiration Date: 
September 20, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 20, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3900428 3901828 InventorAssigneeApplicationNo. 05/689385 filed on 05/24/1976US Classes:502/303, Lanthanum423/213.2, Utilizing as solid sorbent, catalyst, or reactant a material containing a transition element423/213.5, Group VIII element423/263, RARE EARTH COMPOUND (AT. NO. 21, 39, OR 57-71)423/593.1, Plural metals or metal and ammonium containing502/314, Iron group metal and Group III metal containing (i.e., Fe, Co or Ni and Sc, Y, Al, Ga, In or Tl)502/324, Of manganese502/325, Of Group VIII (i.e., iron or platinum group)502/326, Of platinum group metal and of iron group (i.e., Ru, Rh, Pd, Os, Ir, or Pt and Fe, Co or Ni)502/525PEROVSKITEExaminersPrimary: Shine, W. J.AbstractMetal oxides of the type [A11-x A2x ]B'1-y Mey ]O3 having perovskite-type crystal structures in whichA1 and A2 are each one or more mono-, di-, or trivalent metals having ionic radii between about 0.8 and 1.65 Angstroms;B' is one or more metals having ionic radii between about 0.4 and 1.4 Angstroms;Me is one or more metals of the platinum group (ruthenium, osmium, rhodium, iridium, palladium, and platinum);x is between about 0.01 and 0.99; andy is between about 0.01 and 0.20Are useful as catalysts for the oxidation of hydrocarbons and carbon monoxide and for the reduction of nitrogen oxides under conditions typical of those involved in the cleanup of the exhaust gases of internal combustion engines. |
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