氨法选择性还原氮氧化物V 2 O 5 /TiO 2 -PILC催化剂的抗硫性能

A titania pillared interlayered clay (Ti-PILC) supported vanadia catalyst (V 2 O 5 /TiO 2 -PILC) was prepared by wet impregnation for the selective catalytic reduction (SCR) of NO with ammonia. Compared to the traditional V 2 O 5 /TiO 2 and V 2 O 5 -MoO 3 /TiO 2 catalysts, the V 2 O 5 /TiO 2 -PILC catalyst exhibited a higher activity and better SO 2 and H 2 O resistance in the NH 3 -SCR reaction. Characterization using TPD, in situ DRIFT and XPS showed that surface sulfate and/or sulfite species and ionic SO 4 2 - species were formed on the catalyst in the presence of SO 2 . The ionic SO 4 2 - species on the catalyst surface was one reason for deactivation of the catalyst in SCR. The formation of the ionic SO 4 2 - species was correlated with the amount of surface adsorbed oxygen species. Less adsorbed oxygen species gave less ionic SO 4 2 - species on the catalyst.