Synthesis and Characterization of Mesoporous Iron Oxide by Solid Thermal Decomposition Reaction for Catalytic Oxidation of CO

S.M. El-Sheikh, F.A. Harraz, and K.S. Abdel-Halim (Egypt)


Mesoporous, Iron oxide, Thermal decomposition, Nanostructures, Catalytic oxidation, CO


Mesoporous iron oxide was synthesized by thermal decomposition reaction of Fe (NO3)3.9H2O in the presence of citric acid (CA) as a template agent. The produced nano-powder was characterized by XRD, FT IR, TEM, N2 adsorption-desorption isotherms, and thermo-analytical methods. Mesoporous iron oxide with high surface area (244 m2 /g) and pore diameter distribution in the range of 1-6 nm was successfully achieved. Both the particle size and phase structure are greatly influenced by the ratio of iron precursor-to-CA, thermal temperature, and operating time. The results show that the maghamite phase appears at low temperature (100 0 C) of preparation and turns to crystalline phase when the temperature rises to 120 0 C. The produced mesoporous iron oxide powder was tested for catalytic oxidation of carbon monoxide (CO) using advanced quadrpole mass gas analyzer system. The efficiency of using mesoporous iron oxide particles for removal of CO has been investigated at different operating temperatures. The results show that CO is completely oxidized to CO2 at 200 o C. The catalytic process was essentially affected by the presence of maghamite phase, crystal size and surface area of the mesoporous iron oxide.

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