Environ. Sci. Technol. 2010, 44, 1799–1805
Mechanism of Propene Poisoning on Fe-ZSM-5 for Selective Catalytic Reduction of NOx with Ammonia J U N H U A L I , * ,†,‡ R O N G H A I Z H U , † YISUN CHENG,§ CHRISTINE K. LAMBERT,§ AND RALPH T. YANG‡ Department of Environment Science and Engineering, Tsinghua University, Beijing, China 100084, Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, and Research and Innovation Center, Ford Motor Company, Dearborn, Michigan 48121
Received November 26, 2009. Revised manuscript received January 14, 2010. Accepted January 26, 2010.
Application of Fe-zeolites for urea-SCR of NOx in diesel engine is limited by catalyst deactivation with hydrocarbons. In this work, we investigated the effect of propene on the activity of Fe-ZSM-5 for selective catalytic reduction of NOx with ammonia (NH3-SCR), and proposed a deactivation mechanism of Fe3+ active site blockage by propene residue. The NO conversion decreased in the presence of propene at various temperatures, while the effect was not significant when NO was replaced by NO2 in the feed, especially at low temperatures (
