| 초록 |
Cu ion exchanged SSZ-13 is successfully commercialized in the industrial fields as a NH3-SCR catalyst due to its excellent reactivity and hydrothermal stability. Here, we investigated the mobility of Cu ion species in the Cu-SSZ-13 under NH3-SCR condition, which is known to be a significant nature forming the reaction intermediates. Cu ions species have different mobility depending on their interaction with aluminum sites in the SSZ-13 framework. The kinetic studies allowed us to reveal that the mobility of Cu ions species determines different NH3-SCR activity, demonstrating that the higher mobility of Cu ion species leads to superior NH3-SCR activity of Cu-SSZ-13 catalysts. Furthermore, based on such mobility-activity relationship, we designed the rational catalyst controlling the mobility of Cu ion by adding the cobalt co-cation. Addition of cobalt ions led the Cu ions to exist as species with higher mobility, improving catalytic activity at low-temperature. |
