LTA catalysts having extra-framework iron and/or manganese for treating exhaust gas
AssigneeJohnson Matthey Public Limited Company
InventorJoseph Fedeyko
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Abstract
Provided are compositions, articles, systems and methods that comprise or use a catalyst composition comprising a zeolite having an LTA structure with iron, manganese or a combination thereof as an extra-framework metal. The zeolite can have a mole ratio of silica-to-alumina (SAR) of about 15 to about 70 and can contain about 0.5 to about 10 weight percent, based on the total weight of the zeolite, of extra-framework iron, manganese or a combination thereof.
Claims18
A catalyst composition comprising an aluminosilicate molecular sieve having an LTA framework and a mole ratio of silica-to-alumina of about 15 to about 70, and about 0.5 to about 10 weight percent of manganese as extra-framework metal, based on the total weight of the molecular sieve material.
Dependencies are inferred from the claim text.