Temperature-dependent dynamics of NH3-derived Cu species in the Cu-CHA SCR catalyst

In situ XAS and UV-vis–NIR spectroscopy shed light on Cu-speciation during NH₃ temperature-programmed desorption and surface reaction (TPSR) over a commercial Cu-chabazite deNO_x catalyst, expanding the fundamental knowledge required to unravel the NH₃-SCR mechanism across the whole operation-relevant temperature range.