Identifying the Fe₃Mn₃O₈ phase as a superior catalyst for low-temperature catalytic oxidation of formaldehyde in air

Abstract

This work reports the efficient binary Fe-Mn metal oxide catalysts for low-temperature formaldehyde (HCHO) oxidation in air. The highest catalytic activity was obtained at the molar ratio of Fe/Mn =...

Constructing Oxygen Vacancies via Engineering Heterostructured Fe3C/Fe3O4 Catalysts for Electrochemical Ammonia Synthesis

“…Therefore, the Fe species in the Fe 3 C/Fe 3 O 4 @C‐950 should be more active than the Fe 3 O 4 ‐950, consistent with the measured catalytic activity. Besides, the decrease in the reduction temperature in the Fe 3 C/Fe 3 O 4 @C‐950 catalyst indicates the higher mobility of the oxygen species near the active metal ions, likely due to oxygen vacancy generation, significantly affecting the catalysts′ redox properties [37] . Notably, the Fe 3 C/Fe 3 O 4 @C‐950 catalyst also has a reduction peak at ≈278.4 °C due to the reduction of Fe 3 C to Fe.…”

“…Besides, the decrease in the reduction temperature in the Fe 3 C/Fe 3 O 4 @C-950 catalyst indicates the higher mobility of the oxygen species near the active metal ions, likely due to oxygen vacancy generation, significantly affecting the catalysts' redox properties. [37] Notably, the Fe 3 C/Fe 3 O 4 @C-950 catalyst also has a reduction peak at � 278.4 °C due to the reduction of Fe 3 C to Fe. Furthermore, both samples exhibited similar EPR signals (Figure 5c), likely due to the electrons trapped in oxygen vacancies.…”

Synthesis of Magnetic N‐Vinylformamide Grafted Starch and Its Application in Heavy Metals Adsorption

“…Fe 3 Mn 3 O 8 formed through the reaction between Fe 3 O 4 and MnSO 4 shows diffraction peaks at 29.7°, 35.26°, 42.66°, 56.7°, 62.36° and correspond to (220), (311), (400), (511), and (440) lattice planes, respectively. [ 34 ] With the increase of manganese dioxide dosage, the synthesized Fe 3 Mn 3 O 8 in NFs showed higher adsorption efficiency for Cu 2+ , Ni 2+ , and Cr 2 O 7 2− . M‐SGC also had δ‐MnO 2 crystals, which could be used for heavy metal adsorption.…”

Enhanced oxygen activation on an atomically dispersed Au catalyst with dual active sites for room-temperature formaldehyde oxidation

“…4,5 Catalytic oxidation, due to its high efficiency and zero energy input, is of great significance for air cleaning in an enclosed environment. [6][7][8] Hence, developing effective catalysts to remove indoor-air HCHO, as well as understanding the catalytic reaction mechanism, is significant to conform to the air-quality requirements and reduce public health risks.…”