UNDERSTANDING OF DEACTIVATION BEHAVIOR OF DENOX CATALYSTS - A KEY TO ADVANCED CATALYST APPLICATIONS

Despite numerous contributions to the literature since 1975 regarding SCR catalysis with ammonia for NOx removal from combustion gases, ther e is still on-going, heated discussion in academia concerning both cat alytically active sites of the SCR mechanism and deactivation phenomen a with regard to practical SCR applications. It was demonstrated that exposure of a TiO2MoO3-V2O5 system to arsenic-laden flue gases resulte d in modification of the active sites, which still remain functional. Changes in reaction kinetics suggest a mechanism of selective poisonin g.