Selective catalytic reduction of NOx to nitrogen over Co-Pt/ZSM-5 - Part A. Characterization and kinetic studies

The selective catalytic reduction of NO by propene in the presence of exces s oxygen has been studied over catalysts based on Co-Pt supported on ZSM-5. Pure Pt based catalysts are highly active, but produce large amounts of N2 O. Bimetallic Co-Pt/ZSM-5 catalysts with low Pt contents (0.1 wt.%) show a synergistic effect by combining high stability and activity of Pt catalysts with the high N-2 selectivity of Co catalysts. The lower selectivity to N2 O is attributed to its selective conversion over Co. The catalysts also sho wed high water and sulfur tolerance above 350 degreesC. (C) 2001 Elsevier S cience B.V. All rights reserved.