Selective catalytic reduction of NO with NH3 over natural zeolites and its application to stationary diesel engine exhaust

Cation exchanged natural zeolite catalysts for the reduction of NO with NH3 were developed. The synthetic mordenite containing Cu, V, and Cr cations showed high activity for the reduction of NO with NH3. Natural Izulralite containing mainly mordenite exhibits high activity for the selective reduction of NO when they were anchored with Cu, Mn, Co, and V cations. Furthermore, the anchored pellet catalysts prepared from Zeo 3S (clinoptilolite) and Izukalite exchanged with vanadium ions and mixed with TiO2 exhibited high activity for the reduction of NO with NH3. The honeycomb catalysts prepared from V-Izukalite were found to be especially effective for stationary diesel engine exhaust. (C) 1998 Elsevier Science B.V. All rights reserved.