A method for treating a catalyst base that comprises a contact area of porous material. A fluid, such as a flue gas stream, can be conducted along the contact area. A catalytically relevant substance is introduced into pores of the catalyst base using a transport fluid and remains on pore wall areas
A method for treating a catalyst base that comprises a contact area of porous material. A fluid, such as a flue gas stream, can be conducted along the contact area. A catalytically relevant substance is introduced into pores of the catalyst base using a transport fluid and remains on pore wall areas after removal of the transport fluid. The introduction is carried out such that an amount of the catalytically relevant substance relative to the surface remains on the pore wall areas as a function of location within the pore and decreases within the pore after exceeding a specific pore depth. A blocking fluid can first be introduced into pore regions beyond the specific pore depth, thus blocking these regions when transport fluid containing the catalytically relevant substance is introduced.
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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 a
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; andremoving 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 SO2 oxidation compared to a catalyst having a surface coverage of the catalytically relevant substance that is uniform or increases with increasing pore depth. 2. A method according to claim 1, 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 within each pore is a function of the pore depth such that up to the specific pore depth the amount of the catalytically relevant substance relative to the surface increases, essentially remains constant, or at most decreases continuously, and that, after exceeding the specific pore depth, the amount relative to the surface and/or the increase of the amount relative to the surface suddenly starts decreasing. 3. A method according to claim 1, wherein said step of introducing the blocking fluid comprises: a filling step, during which the blocking fluid is introduced into a plurality of the pores such that the pores are at least partially filled with the blocking fluid; anda removing step, during which the introduced blocking fluid is partially removed such that only the regions remote from the contact area beyond the specific pore depth remain filled. 4. A method according to claim 3, wherein the catalyst base is immersed in the blocking fluid during said filling step. 5. A method according to claim 3, wherein the blocking fluid is a liquid and wherein the catalyst base is dried by heating or at room temperature, optionally in a partial vacuum, in order to partially remove the blocking fluid. 6. A method according to claim 1, wherein said step of removing the blocking fluid and the transport fluid is carried out at least part of the time at temperatures less than those used in the blocking fluid or transport fluid introduction steps and/or in a partial vacuum. 7. A method according to claim 1, wherein the transport fluid contains at least one metal compound as the catalytically relevant substance. 8. A method according to claim 1, wherein water is the main component of at least one of the blocking fluid and the transport fluid. 9. A method according to claim 1, wherein the blocking fluid contains catalytically neutral ions. 10. A method according to claim 9, wherein said catalytically neutral ions are adapted to react with the catalytically relevant substance. 11. A method according to claim 1, wherein the blocking fluid and the transport fluid are fluids that do not mix with one another. 12. A method according to claim 1, wherein the blocking fluid has a higher boiling point than the transport fluid. 13. A method according to claim 1, wherein the cleaning step removes substances from the catalyst base via washing out or vaporization. 14. A method according to claim 1, further comprising heat treating or calcining the catalyst to convert the at least one catalytically relevant substance to a catalytically active substance selected from the group consisting of tungsten oxide, vanadium pentoxide, and molybdenum oxide. 15. A method for reactivating a selective catalytic reduction catalyst base comprising a titanium dioxide base material and at least one contact area of porous material, the method comprising: cleaning the catalyst base;introducing a blocking fluid into pores of the catalyst base;partially removing the blocking fluid from the pores such that in regions remote from the contact area beyond a specific pore depth, the pores remain filled with a blocking fluid;introducing a least one catalytically relevant substance into the pores by means of a transport fluid by immersing the catalyst base in the transport fluid comprising the at least one catalytically relevant substance;removing the blocking fluid and the transport fluid from the pores wherein the catalytically relevant substance remains on pore wall areas such that an amount of the catalytically relevant substance relative to a surface of a pore wall is a function of depth within the pore and the amount of the catalytically relevant substance relative to the surface decreases within the pore after exceeding the specific pore depth; andheat treating or calcining the catalyst to convert the at least one catalytically relevant substance to a catalytically active substance selected from the group consisting of tungsten oxide, vanadium pentoxide, and molybdenum oxide,wherein the reactivated catalyst displays a decreased SO2 oxidation compared to a catalyst having a surface coverage of the catalytically relevant substance that is uniform or increases with increasing pore depth.
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