| 초록 |
Reducing the environmentally harmful NOx emitted from diesel engine is one of the challenging problems to be solved in the catalyst field. NH3 Selective Catalytic Reduction (NH3-SCR) technology using Cu- or Fe-zeolites as a catalyst were intensively studied for last several decades. Recently, Cu-SSZ-13 has been reported to exhibit excellent activity/selectivity and hydrothermal stability and has been extensively studied and commercialized. Although many mechanistic, kinetic and spectroscopic studies have been devoted to the origin of NH3-SCR, the role and behavior of Cu2+ in the reaction process are not yet clear enough. Using in-situ XRD combined with Rietveld, we studied the position of Cu2+ and its interaction with reactant such as NO and NH3. In this work, we will present the results that the Cu2+ position changes related with dehydration and they are very similar with Cu2+ location changes with adsorption and desorption of NH3. |
