초록

The method for the reagentless removal of nitrogen oxides from oxygen rich exhaust streams which includes impinging the exhaust gases upon a catalyst which includes a Lewis base metal cation, bismuth oxide and a mixture of transition metal cations.

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[ What is claimed:] [1.] The method of catalytically removing nitrogen oxides from oxygen rich exhaust streams by direct conversion of the nitrogen oxides to nitrogen and oxygen comprising the steps of selecting a catalyst represented by the following stoichiometriesEQU (BiO.sub.1.5).sub.1-x-y-z /(B

[ What is claimed:] [1.] The method of catalytically removing nitrogen oxides from oxygen rich exhaust streams by direct conversion of the nitrogen oxides to nitrogen and oxygen comprising the steps of selecting a catalyst represented by the following stoichiometriesEQU (BiO.sub.1.5).sub.1-x-y-z /(B.sub.n O).sub.x /(M.sup.1 O).sub.y /(M.sup.2 O).sub.z re B=a basic cation chosen from Ba.sup.2+ or Sr.sup.2+ (n=1) or from the alkali metal cations (n=2: Li.sup.+, Na.sup.+, K.sup.+, Rb.sup.+, or Cs.sup.+); M.sup.1 =a transition metal cation of Co, Fe, or Ni; and M.sup.2 =a transition metal cation of Cu, V, Nb, or W, where the ranges of the subscripts are as follows: 0