Abstract
Mn/TiO 2 and ceria modified Mn/TiO 2 were prepared by sol–gel method and used for low-temperature selective catalytic reduction (SCR) of NO with NH 3 in the presence of SO 2 . The deactivation of Mn/TiO 2 by SO 2 was observed during SCR process and the depositions of (NH 4 ) 2 SO 4 and NH 4 HSO 4 were detected on Mn/TiO 2 surface. It was found that the resistance to SO 2 could be greatly enhanced for Ce modified Mn/TiO 2 . It was because that the formation of Ti(SO 4 ) 2 and Mn(SO 4 ) x was prevented and the depositions of (NH 4 ) 2 SO 4 and NH 4 HSO 4 were significantly inhibited with the doping of ceria.
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