Patent ID: 8153542
Filing Date: 2012-04-10
Classification: B01D,B01J

Abstract:
1. A method for reactivating a used selective catalytic reduction catalyst base in which active metal compounds have been homogeneously introduced, wherein the catalyst base comprises at least one contact area of a porous material comprising a titanium dioxide base material, and wherein a fluid is adapted to be conducted along said contact area, the method comprising the steps of: cleaning the catalyst base; introducing a blocking fluid into pores of the catalyst base such that in regions remote from the contact area, beyond a specific pore depth, the pores are filled with the blocking fluid; subsequently introducing at least one catalytically relevant substance into the pores of the catalyst base partially filled with the blocking fluid by means of a transport fluid by immersing the catalyst base in its assembled state in the transport fluid comprising the at least one catalytically relevant substance; and removing the blocking fluid and the transport fluid, wherein the catalytically relevant substance remains on pore wall areas after removal of the transport fluid, wherein said step of introducing at least one catalytically relevant substance is carried out in such a way that, in at least a plurality of pores, an amount of the catalytically relevant substance relative to the surface remaining on the pore wall areas is a function of depth within each pore such that the catalytically relevant substance at least partially remains on the pore wall areas above the specified pore depth and the amount of the catalytically relevant substance relative to the surface decreases within the pore after exceeding the specific pore depth, wherein the reactivated catalyst displays a decreased SO