Abstract
Five pillared clays (PILC) have been synthesized and tested for their activities in the selective catalytic reduction (SCR) of NO by NH 3 in the temperature range 250-450°C. They all showed considerable activities, in the decreasing order Cr 2 O 3 -PILC, Fe 2 O 3 -PILC, TiO 2 -PILC, ZrO 2 -PILC, and Al 2 O 3 -PILC. Cr 2 O 3 -PILC exhibited higher activities than a commercial (VTT) WO 3 -V 2 O 5 /TiO 2 catalyst, but its activity was severely decreased by SO 2 . Fe 2 O 3 -PILC showed activities comparable to that of V 2 O 5 /TiO 2 and was SO 2 resistant. Doping with cerium oxide significantly enhanced the activity; for Fe 2 O 3 -PILC, doping with 1.5-2% CeO 2 more than doubled its activity, and the resulting activity was significantly higher than that of the VTT commercial catalyst (both with and without SO 2 and H 2 O). The formed PILC catalyst will have a bimodal pore structure, with which a superior poison resistance has been demonstrated in SCR operation with a V 2 O 5 -based catalyst. Thus, the high activities and the potential poison resistance make pillared clays a promising new class of catalyst for SCR applications
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