Bi-metal molecular sieve catalysts
AssigneeJohnson Matthey Public Limited Company
InventorsAlejandra RIVAS-CARDONA, Hai-Ying CHEN, Joseph Michael FEDEYKO
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Abstract
Provided is a catalyst composition comprising a small pore molecular sieve, about 0.5-5 weight percent of a transition metal (TM) selected from copper and/or iron, based on the total weight of the zeolite, and about 0.5-5 weight percent nickel, based on the total weight of the molecular sieve, wherein the transition metal and nickel are present in a TM:Ni ratio of about 10:1 to about 1:2. Also provided is a synthesis method for preparing a small pore molecular sieve having both Cu and Ni incorporated in situ. Also provided is a method for using such a catalyst for selectively reducing NOx in an exhaust gas.
Claims20
A catalyst composition comprising a small pore molecular sieve, about 0.5-5 weight percent of a transition metal (TM) selected from copper and/or iron, based on the total weight of the molecular sieve, and about 0.5-5 weight percent nickel, based on the total weight of the molecular sieve, wherein the transition metal and nickel are present in a TM:Ni ratio of about 10:1 to about 1:2.
A method for synthesizing a molecular sieve comprising:
- heating an admixture comprising a source of silica, a source of alumia, optionally a source of phosphate, a source of copper and/or iron, a source of nickel, and at least one structure directing agent to form zeolite crystals containing nickel and at least one of copper and iron, and
- separating the molecular sieve crystals from the mother liquor.
Dependencies are inferred from the claim text.