Abstract
Mn-doped maghemite (γ-Fe2O3) particles were generated from a binary metal (Fe,Mn)-based metal–organic framework (MOF) via thermal decomposition under air. The X-ray photoelectron spectroscopy analysis revealed that the synthesis of Fe/Mn-MOF accompanied the reduction of the metal ions. The existence of Mn ions in this synthetic process leads to thermally stable maghemite particles under air. A temperature-induced structural phase transition from γ-Fe2O3 to α-Fe2O3 was observed through a mixed phase with another structure. Mn-doped γ-Fe2O3 and α-Fe2O3 exhibit superparamagnetic behavior. The sample annealed at 600 °C showed a mixed magnetic hysteresis loop indicating the existence of an intermediate structural phase between γ-Fe2O3 and α-Fe2O3 during the phase conversion from FeMn-MOF. The constructed Mn-doped iron oxides are active toward reducing nitric oxide with NH3. The NO conversion is 97% over Mn-doped γ-Fe2O3 calcined at 320 °C.
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