The Synthesis of Iron Oxides with Different Phases or Exposure Crystal Planes and their Catalytic Property for Propene Oxidation

Abstract:

Maghemite (γ-Fe_{Subscript text}2O_{Subscript text}3) and hematite (α-Fe2O3) nanoparticles with various dominant exposure crystal planes were prepared by several different methods. The structure and the reducibility of these materials were investigated by XRD, Raman and H2-TPR technologies, and their catalytic performance for propene oxidation was also discussed. The maghemite (γ-Fe_{Subscript text}2O_{Subscript text}3) showed a better reducibility than hematite (α-Fe_{Subscript text}2O_{Subscript text}3), but its activity for propene oxidation is relatively lower. The exposure crystal plane of hematite has a significant influence on its catalytic activity for propene oxidation. Among the prepared four samples, the hematite-1 sample showed the best activity. The selective growth of any planes with a relative low density of Fe atoms for the α-Fe_{Subscript text}2O_{Subscript text}3 catalyst would lead to an obvious decrease in the catalytic activity.

• Periodical: Advanced Materials Research (Volumes 463-464)
• Pages: 189-193
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.463-464.189
• Online since: February 2012
• Authors: Kong Zhai Li, Masaaki Haneda, Masakuni Ozawa
• Keywords: Crystal Planes, Phase, Propene Oxidation, α-Fe₂O₃, γ-Fe₂O₃

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