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rR spectra (λex = 457.9 nm) of Cu-ZSM-5 (Cu/Al = 0.54) activated in O2 (Upper) or N2O (Lower). Inset Diffuse reflectance UV-vis spectra recorded at room temperature after treatment of Cu-ZSM-5 with O2 (Upper) or N2O (Lower) in the temperature range of 100 °C-200 °C and 50–125 °C respectively. The arrows on Inset represent the increasing temperature of the O2 and N2O treatment (temperature difference between two spectra is 25 °C).
