Deactivation Behavior of Selective Catalytic Reduction DeNO_x Catalysts

Abstract

Siemens Power Generation Group (KWU) has developed an SCR DeNOx plate-type catalyst without the use of Japanese catalyst technology. This innovative development is particularly suitable for demanding applications with flue gases from slag tap furnaces containing high heavy-metal concentrations (e. g. arsenic oxides). A special feature of this catalyst is that the high SO2 content in flue gases from combustion of sulfur-rich fuel does not have any significant effects on DeNOx catalysis. The catalytically active phase used for this catalyst was developed in deactivation investigations on MoO3-V2O5 compounds dispersed on TiO2 (anatase). These investigations were conducted in the light of the high arsenic oxide concentrations in German slag tap furnaces with 100% ash recirculation.