Figure 1.
UV-vis absorption spectra of a pre-reduced Cu-ZSM-5 (in He at 450°C) during A) O2 treatment at RT. Time interval between spectra 10 sec in the first 2 min, then every 50 sec for 10 min B) subsequent heating from 25°C to 375°C in He atmosphere (temperature interval between spectra is 25°C).