Fig. 3: The dynamic evolution of Fe sites during the NO oxidation reaction.
From: Single iron redox sites boost Methanol-SCR at low temperature
a Effect of the amount of Fe on the activity of NO oxidation on FER zeolites. b The relationship of the amount of [FeO]+ with reaction rate for NO oxidation at 175 °C. c In situ Mössbauer spectra of 0.6Fe-FER zeolite were collected at 300 °C with 14% O2/N2 flowed in; with 1000 ppm NO/N2 flowed in instead of 14% O2/N2; with 14% O2/N2 flowed in instead of 1000 ppm NO/N2. The arrows represent the order in which the gases were introduced. The fitted peaks in orange represent the component V. d Time-resolved in situ FT-IR spectra of 0.6Fe-FER zeolite collected at 300 °C with 14% O2/N2 flowed in; with 1000 ppm NO/N2 flowed in instead of 14% O2/N2; with 14% O2/N2 flowed in instead of 1000 ppm NO/N2. The spectra were collected with 1-minute intervals. e Structural schematic of the dynamic evolution of Fe sites during the NO oxidation reaction.
