Transition metal/zeolite SCR catalysts
OwnerPaul Joseph Andersen, Jillian Elaine Bailie +5inventors
InventorsPaul Joseph Andersen, Jillian Elaine Bailie, John Leonello Casci, Hai-Ying Chen, Joseph Michael Fedeyko, Rodney Kok Shin Foo, Raj Rao Rajaram
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Abstract
A method of converting nitrogen oxides in a gas to nitrogen by contacting the nitrogen oxides with a nitrogenous reducing agent in the presence of a zeolite catalyst containing at least one transition metal, wherein the zeolite is a small pore zeolite containing a maximum ring size of eight tetrahedral atoms, wherein the at least one transition metal is selected from the group consisting of Cr, Mn, Fe, Co, Ce, Ni, Cu, Zn, Ga, Mo, Ru, Rh, Pd, Ag, In, Sn, Re, Ir and Pt.
Claims14
A catalyst comprising at least one small pore aluminosilicate molecular sieve wherein said molecular sieve has a framework type selected from AEI, DDR, LEV, PAU, and UEI, has an SAR of about 8 to about 150, and contains 0.5 to 5 weight percent ion exchanged Cu, the catalyst effective to promote the reaction of NH3 with NOx to form nitrogen and water, selectively.
Dependencies are inferred from the claim text.