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US 2026/0284646 A1Published application
Modified copper zeolites and method of using the same for treatment of gas streams containing nox
AssigneeBASF SE
InventorsMatthew T. CAUDLE, Vivek VATTIPALLI, YuFen HAO
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Abstract
The present disclosure generally provides catalyst compositions which may be useful for selective catalytic reduction. The catalyst compositions may include a zeolite which includes copper and at least one additional metal. Methods of decreasing the amount of NOx in a gas stream and an exhaust gas treatment system, which may employ the catalyst compositions described herein, are also described.
Claims21
1-55. (canceled)
A catalyst composition comprising:
- a zeolite having:
- a total amount of aluminum in sites T(n) with n≥2 of about 0.05 mequiv/g to about 5 mequiv/g, a silica to alumina ratio (SAR) of about 5 to about 120, copper, and at least one additional metal that is not copper,
- wherein the additional metal has a charge to radius ratio (Z/r) of about 1.2 to about 3.0, and wherein the metal is not sodium or potassium,
- wherein the zeolite has a copper content between about 0.05 mequiv/g and about 5.0 mequiv/g on a Cu2+ basis, and
- wherein the copper loading in mequiv/g on a Cu2+ basis is less than the total amount of aluminum equivalents in sites T(n) with n≥2, and wherein, the loading of the additional metal is chosen such that the total metal loading in mequiv/g is less than or equal to the total amount of aluminum equivalents in sites T(n) with n≥1.
2 more elements
Dependencies are inferred from the claim text.