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DRIFT spectra in the carbonyl region recorded during the adsorption (a, c) and desorption (b, d) of CO at room temperature on Pt–Cu alloy NCs supported on Al2O3 after the (a, b) oxidizing and (c, d) reduction treatments; (e) schematic illustration of infrared band assignments for the carbonyl species on Pt–Cu NC identified in the DRIFT spectra.
