Selective Catalytic Reduction Catalyst System
AssigneeBASF SE
InventorsWeiyong Tang, Jaya L. Mohanan
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Abstract
Described are SCR catalyst systems comprising a first SCR catalyst composition and a second SCR catalyst composition arranged in the system, the first SCR catalyst composition promoting higher N2 formation and lower N2O formation than the second SCR catalyst composition, and the second SCR catalyst composition having a different composition than the first SCR catalyst composition, the second SCR catalyst composition promoting lower N2 formation and higher N2O formation than the first SCR catalyst composition. The SCR catalyst systems are useful in methods and systems to catalyze the reduction of nitrogen oxides in the presence of a reductant.
Claims20
A selective catalytic reduction (SCR) catalyst system comprising a first SCR catalyst composition and a second SCR catalyst composition arranged in the system, the first SCR catalyst composition promoting higher N2 formation and lower N2O formation than the second SCR catalyst composition, and the second SCR catalyst composition having a different composition than the first SCR catalyst composition, the second SCR catalyst composition promoting lower N2 formation and higher N2O formation than the first SCR catalyst composition, wherein the first SCR catalyst composition and the second SCR catalyst composition are in a layered relationship, with the first SCR catalyst composition layered on top of the second SCR catalyst composition.
A selective catalytic reduction (SCR) catalyst system comprising a first SCR catalyst composition comprising vanadia/titania disposed on a substrate and a second SCR catalyst composition comprising a metal-exchanged 8-ring small pore molecular sieve disposed on a substrate, wherein the first SCR catalyst composition and the second SCR catalyst composition are in a layered relationship, with the first SCR catalyst composition layered on top of the second SCR catalyst composition.
Dependencies are inferred from the claim text.