화학공학소재연구정보센터
Catalysis Today, Vol.191, No.1, 6-11, 2012
Copper exchanged ultrastable zeolite Y - A catalyst for NH3-SCR of NOx from stationary biogas engines
NOx emissions will need to be controlled from gas engines, which in the future could be using a syngas/producer gas as a fuel (generated from the gasification of biomass). In anticipation of this need, the activity of a copper-exchanged ultrastabilized zeolite Y was investigated, for the selective catalytic reduction of NOx. The catalyst performance and properties were compared with reference samples of Cu-exchanged un-stabilized Y and Cu exchanged ZSM-5 zeolites. Activity was related to the number and nature of active centers, which were determined by in situ FTIR and TPD experiments using CO, NO, and NH3 as probe molecules. In the test reaction the ultrastabilized Cu-USY catalyst showed high activity at low temperatures and offered high hydrothermal resistance, whilst the Cu-ZSM-5 catalyst demonstrated the highest overall activity. The observed low temperature activity of the ultrastabilized Cu-USY catalyst was linked to the high abundance of Cu+ sites, which were detected by in situ FTIR analyses using CO adsorption. (c) 2012 Elsevier B.V. All rights reserved.