27-07-2017 дата публикации
Номер: US20170209857A1
Принадлежит:
A heterogeneous catalyst article having at least one combination of a first molecular sieve having a medium pore, large pore, or meso-pore crystal structure and optionally containing a first metal, and a second molecular sieve having a small pore crystal structure and optionally containing a second metal, and a monolith substrate onto or within which said catalytic component is incorporated, wherein the combination of the first and second molecular sieves is a blend, a plurality of layers, and/or a plurality of zones. 1. A catalyst composition for treating exhaust gas comprising:(a) a first molecular sieve having BEA framework, wherein said first molecular sieve is a ferrosilicate; and(b) a second molecular sieve having a small pore crystal structure and containing about 0.5 to about 5 weight percent of exchanged or free metal selected from Cr, Mn, Fe, Co, Ce, Ni, Cu, Zn, Ga, Mo, Ru, Rh, Pd, Pt, Ag, In, Sn, Re, and Ir, wherein the second molecular sieve is a zeolite aluminosilicate having a silica-to-alumina ratio of about 8 to about 150,wherein said first molecular sieve and said second molecular sieve are present in a weight ratio of about 0.1 to about 1.0.2. The catalyst composition of claim 1 , wherein said second metal is copper.3. The catalyst composition of claim 2 , wherein said second molecular sieve has a framework selected from CHA claim 2 , AEI claim 2 , AFX claim 2 , and LEV.4. The catalyst composition of claim 1 , wherein said second molecular sieve contains about 2.0 to about 4.0 weight percent copper claim 1 , and said first molecular sieve and said second molecular sieve are present in a weight ratio of about 0.2 to about 0.60.5. The catalyst of claim 4 , wherein the second molecular sieve has a CHA framework.6. The catalyst of claim 4 , wherein the second molecular sieve has an AEI framework.7. The catalyst of claim 4 , wherein the second molecular sieve has an AFX framework.8. The catalyst of claim 4 , wherein the second molecular sieve has a LEV ...
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