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Fiber-optic UV–vis spectra of an O2 calcined (450°C) Cu-ZSM-5 (Si/Al=12, Cu/Al=0.54) during reaction with CH4 at a heating rate of 10 °C/min from RT up to 225 °C. The time interval between two spectra is 1.5 min or a temperature difference of 15 °C. Reprinted from 82 with permission from Elsevier.
