Fig. 3: In situ feedstock adsorption and product desorption on CTF-1, g-C3N4 and TiO2.
From: Methane oxidation to ethanol by a molecular junction photocatalyst
a, Comparison of photocatalytic activities of methane transformation on CTF-1, g-C3N4 and TiO2. b, N k-edge NEXAFS spectra of CTF-1 in the presence or absence of LED light (320 nm) irradiation. c, DRIFTS over H2O-saturated CTF-1, g-C3N4 and TiO2 at 25 °C. Inset, favourite water adsorption site on CTF-1 modelled by DFT (C, N, H and O atoms are shown in gold, blue, white and red, respectively). d, Calculated CH4 FTIR signals on CH4-saturated CTF-1 (mainly on benzene units) and g-C3N4 (on triazine units). e, Enlarged DRIFTS of CH4-saturated CTF-1, g-C3N4 and TiO2 at 25 °C. f, In situ 5,5-dimethyl-1-pyrroline-N-oxide (DMPO)-O2•− spin-trapping electron spin resonance (ESR) spectra over CTF-1, g-C3N4 and TiO2 in methanol under 90-s LED irradiation (λ = 365 nm, 10 W). g, Calculated methanol adsorption site and energy on CTF and g-C3N4. h, Calculated ethanol adsorption site and energy on CTF-1 and g-C3N4 by in silico models. i, Calorimetric measurements of methanol and ethanol competitive adsorptions over CTF-1 and g-C3N4. Adsorption heat flow of methanol on ethanol-saturated catalysts’ surface (top) and ethanol on methanol-saturated catalysts’ surface (bottom). Error bars were obtained by three tests of each sample synthesized from three different batches.
