Mn-Doped Maghemite (γ-Fe2O3) from Metal–Organic Framework Accompanying Redox Reaction in a Bimetallic System: The Structural Phase Transitions and Catalytic Activity toward NOx Removal | Zendy

Junhyung Lee | Zendy; SeungYeop Kwak | Zendy

Open Access

Mn-Doped Maghemite (γ-Fe₂O₃) from Metal–Organic Framework Accompanying Redox Reaction in a Bimetallic System: The Structural Phase Transitions and Catalytic Activity toward NOx Removal

Author(s) -

Junhyung Lee,

SeungYeop Kwak

Publication year - 2018

Publication title -

acs omega

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.779

H-Index - 40

ISSN - 2470-1343

DOI - 10.1021/acsomega.7b01865

Subject(s) - maghemite , bimetallic strip , superparamagnetism , materials science , calcination , x ray photoelectron spectroscopy , redox , phase (matter) , inorganic chemistry , thermal decomposition , metal , catalysis , doping , chemistry , magnetite , magnetization , chemical engineering , metallurgy , optoelectronics , organic chemistry , biochemistry , physics , quantum mechanics , magnetic field , engineering

Mn-doped maghemite (γ-Fe 2 O 3 ) 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-Fe 2 O 3 to α-Fe 2 O 3 was observed through a mixed phase with another structure. Mn-doped γ-Fe 2 O 3 and α-Fe 2 O 3 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-Fe 2 O 3 and α-Fe 2 O 3 during the phase conversion from FeMn-MOF. The constructed Mn-doped iron oxides are active toward reducing nitric oxide with NH 3 . The NO conversion is 97% over Mn-doped γ-Fe 2 O 3 calcined at 320 °C.

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