Fig. 4: The conversion of CH4 to CH3OH over FeCu/ZSM-CI.

a In situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (in-situ DRIFTS) spectra of CH4 on FeCu/ZSM-CI catalyst at 80 °C. b–d Kinetic isotope effect experiment of CH4 oxidation to CH3OH over Fe/ZSM-C, Cu/ZSM-I, and FeCu/ZSM-CI. e Kinetic isotope effect experiment of CH3OH production over as-prepared catalysts.