Process for the treatment of catalyst for the purification of flue gas

摘要

Reactivating a catalyst support (3), where the catalyst support is formed as a selective catalytic reduction (SCR)-honeycomb or SCR plate catalyst support and shows at least one contact surface (11) of a porous material, on which a fluid is passed out, comprises: cleaning the SCR catalyst support and removing reaction products from the SCR catalyst support; and introducing at least one substance from which a catalytically relevant substance comprising tungsten oxide, vanadium pentoxide and molybdenum oxide can form, by using a transport fluid (30). Reactivating a catalyst support (3), where the catalyst support is formed as a selective catalytic reduction (SCR)-honeycomb or SCR plate catalyst support and shows at least one contact surface (11) of a porous material, on which a fluid is passed out, comprises: cleaning the SCR catalyst support and removing reaction products from the SCR catalyst support; and introducing at least one substance from which a catalytically relevant substance comprising tungsten oxide, vanadium pentoxide and molybdenum oxide can form, by using a transport fluid (30) into the pores of the catalyst support (15, 16, 17, 19), where the substance is present as an ion in the transport fluid and the catalytically relevant substance after the removal of the transport fluid remains on the porous wall surface (15a, 16a, 17a, 19a). The introduction of the catalytically relevant substance, comprises treating the catalyst support for a first predetermined time period with the transport fluid containing the catalytically relevant substance, where the first time period is chosen such that the transport fluid essentially penetrates to a specific pore depth, and removing the transport fluid from the pores, where the catalytically relevant substance remains at least in part on the porous wall surface, so that in at least a majority of pores, a surface relative amount of catalytically relevant substance remaining on the porous wall surface depends on the place within every pore such that the surface-relative amount of catalytically relevant substance within the pore decreases to increase the specific pore depth. An independent claim is also included for a catalyst support, prepared by the above method.