Use of V2O5/Ti-PILC catalyst for the reduction of NO by NH3

Titania-pillared interlayer clays (Ti-PILCs) exhibited peculiar physicochem ical characteristics as catalyst supports compared to that of titania for t he reduction of NO by NH3. Korean natural bentonite (KNB) was employed as a basic component of PILC due to its high pillaring capacity. For the freeze -dried Ti-PILC, the development of needle-like crystallites revealing the f ormation of a "house-of-cards" structure by delamination of long-ranged lay ered structure of Ti-PILC has been observed. Freeze-drying creates a unique pore structure of Ti-PILC catalyst such as multi-modal pore size distribut ion simultaneously containing micropores and meso- or macropores in the por e network. In particular, V2O5/Ti-PILC catalyst exhibits high performance o f NO removal by NH3 mainly due to the strong catalyst surface acidity and r edox properties examined by NH3 TPD and TPR-TPO studies, respectively. With out the addition of the catalyst promoter, WO3 and MoO3 to the catalyst, V2 O5/Ti-PILC catalyst shows competitive NO removal activity to a commercial o ne.