The influence mechanisms of SO 2 on selective catalytic reduction (SCR) of NO over activated carbon honeycomb supported MnO x (Mn/ACH) and CeO 2 –MnO x (CeMn/ACH) catalysts were investigated at low temperature. The catalysts under different conditions were characterized by transient response experiment, nitrogen adsorption, X-ray diffraction, and X-ray photoelectron spectroscopy techniques. Results indicate that SO 2 deactivates the SCR activities of Mn/ACH and CeMn/ACH catalysts at 160 °C. The deactivation is mainly due to the deposition of ammonium sulfite and ammonium sulfate on the catalysts’ surfaces during the NO removal process in the presence of SO 2 . Compared with Mn/ACH, CeMn/ACH catalyst exhibits a higher resistance to SO 2 poisoning, because the addition of CeO 2 inhibits the formation of ammonium salts. These ammonium salts decrease SCR activities through pore blocking; however, they can be completely removed by thermal regeneration at 350 °C. Furthermore, the competitive adsorption between SO 2 and NH 3 also decreases SCR activities.
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Wang et al. (2015) studied this question.
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