Fig. 7: Determination of reactive radical species.
From: Insight into selectivity of photocatalytic methane oxidation to formaldehyde on tungsten trioxide
a EPR spectra of WO3{110} in O2 atmosphere at 77 K temperature. The WO3{110} is the recycled sample after CH4 oxidation reaction without O2. b EPR spectrum of WO3{110} under light irradiation for 80 s with CH4 and O2 dissolved in methanol. DMPO is added to the reaction mixture as the radical trapping agent. The WO3{110} is the recycled sample after CH4 oxidation reaction without O2. c Band energy diagrams of WO3{001} and WO3{110}.
