File Name : fig.s1_600dpi.jpg Caption : visualization of the energy-dependent photon flux of the incident x-ray beam as well as the energy range of the ccd detector achieved by dispersion on an si(111) crystal (light purple). File Name : figs2_600dpi.jpg Caption : xanes curves for reference mo compounds (a) and first derivatives of the recorded xanes (b). mo foil, moo2 and moo3 were measured experimentally. moc and mo2c were retrieved from the materials project repository File Name : figs3_600dpi.png Caption : methane conversion and categorical product yields for the mda reaction on 6mo/hzsm-5 (300 mg catalyst, 600 °c, 16 sccm 90 % ch4 / 10 % n2). File Name : figs4_600dpi.png Caption : temperature-programmed reduction profile of 6mo/hzsm-5 in 5 % h2 / 95 % n2. the applied temperature ramp was 10 °c min-1 (dashed red line).