Patent ID: 8637418

Claim:
A method for treating a selective catalytic reduction catalyst base comprising: introducing a blocking fluid into pores of the catalyst base such that the pores are partially filled with the blocking fluid beyond a specific pore depth; introducing at least one catalytically relevant substance into the pores of the catalyst base that are partially filled with the blocking fluid by immersing the catalyst base in a transport fluid comprising the at least one catalytically relevant substance; and removing the blocking fluid and the transport fluid from the pores of the catalyst base and leaving an amount of catalytically relevant substance on the pore wall areas, wherein in at least a plurality of pores the amount of catalytically relevant substance remaining on the pore wall areas after removal of the transport fluid is a function of depth within the pore, wherein the catalytically relevant substance at least partially remains on the pore wall areas above the specific pore depth and the amount of catalytically relevant substance relative to the external surface of the catalyst base decreases within the pore below the specific pore depth.