Ti(IV)-doped γ-Fe2O3 nanoparticles possessing unique textural and chemical properties: Enhanced suppression of phase transformation and promising catalytic activity

Khaleel, Abbas; Parvin, Maliha; AlTabaji, Moahmmed; Alzamly, Ahmed

doi:10.1016/j.jssc.2018.01.008

Cited by 6 publications

(3 citation statements)

References 31 publications

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“…However, for Ti‐γ‐Fe 2 O 3 , the phase transition shifts up by 160 °C, i. e., the α‐Fe 2 O 3 phase appears at 660 °C. Thus, the Ti 4+ doping enhanced the thermal stability of γ‐Fe 2 O 3 , consistent with the findings reported previously ,…”

Section: Resultssupporting

confidence: 92%

“…Our recent work demonstrated that Fe 3+ Td served as catalytically active sites in SCR because the electron transfer from inactive Fe 2+ to active Fe 3+ in the tetrahedral site is easier than that in the octahedral site . Thus, it is feasible to enhance the stability by occuping the vacancies and substituting the Fe 3+ Oh sites by suitable metal cations ,…”

Section: Introductionmentioning

confidence: 99%

“…doped Mn 3+ cations into the octahedral sites of γ‐Fe 2 O 3 and improved the thermal stability of γ‐Fe 2 O 3 . Khaleel et al . chose Ti 4+ with a more stable electron configuration ( t 2g 0 e g 0 ) as a doping ion to significantly improve the stability of γ‐Fe 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

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Simultaneously Enhancing Stability and Activity of Maghemite via Site‐Specific Ti(IV) Doping for NO Emission Control

Chen

et al. 2018

ChemCatChem

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Maghemite (γ‐Fe2O3) is an environmentally benign catalyst for selective catalytic reduction (SCR) of NO with NH3, but its poor stability and low activity hamper its application in real NO emission control. Herein, we developed a stable Ti4+ doped γ‐Fe2O3 catalyst (Ti‐γ‐Fe2O3) by site‐specific Ti4+ doping at the octahedral sites rather than tetrahedral active sites (Fe3+Td), as substantiated by synchrotron room‐temperature X‐ray diffraction (SXRD) data. In situ SXRD and thermogravimetric analysis (TG) data demonstrate that Ti4+ cations occupying part of the octahedral sites lead to enhanced thermal stability of Ti‐γ‐Fe2O3 with respect to γ‐Fe2O3, thus enabling Ti‐γ‐Fe2O3 to stably operate at 400 °C under simulated normal SCR conditions. Fe L3‐edge and O K‐edge X‐ray absorption spectra show that the high‐valence Ti4+ doping lengthens the Fe3+Td‐O bonds, and activates the lattice oxygen species, thus improving the SCR activity. This work provides a feasible strategy for designing environmentally benign Fe2O3‐based SCR catalysts with significant stability and high catalytic activity.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%