Abstract
Abstract Heterogeneous catalysts for the low temperature NH 3 -SCR of NO x can be strongly deactivated due to the accumulation of specific compounds deriving from an upstream desulphurization unit, such as a Sea Water Scrubber. In this work, we set out to investigate the specific role of K + and of its counter-ion (Cl − or NO 3 − ) on the combined poisoning effect induced on the catalytic features of a MnO x /TiO 2 system. Poisoning of the catalyst was performed ex situ by impregnation with two target loadings of each K salt, followed by a mild thermal treatment at 250 °C, corresponding to the maximum operating temperature of the SCR system. Fresh and poisoned catalysts were characterized by means of ICP-MS, BET, H 2 -TPR, NH 3 -Adsorption, NH 3 -Temperature Programmed Desorption-Reaction and in situ DRIFT and the impact of poisoning was assessed and compared for the NH 3 -SCR of NO as well as for the NH 3 -SCO (Selective Catalytic Oxidation) reaction.
Published Version
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