(631e) H2 Generation From Water-Splitting Using Novel Ferrite Foam Materials
AIChE Annual Meeting
2009
2009 Annual Meeting
Hydrogen Production for a Hydrogen Economy
Reaction and Separations for Thermochemical Cycles
Thursday, November 12, 2009 - 4:55pm to 5:20pm
Thermochemical water-splitting, which utilizes metal oxide (MO) - based redox reactions, has significant commercial potential due to lower water-splitting temperature as compared to thermolysis. Among several materials investigated so far, ferrites such as (AxBy)FezO4 (doped spinel) or (AxBy)Fe1-x-yO (doped wustite) or their mixtures, where A and B being bivalent metal cations such as Mn, Ni or Zn, were reported to be most active materials for hydrogen generation from water-splitting. These ferrites have been used primarily in the form of powder material for water-splitting reaction. In this investigation, ferrite foam material was synthesized using modified sol-gel method. Specifically to synthesize Ni ferrites, Ni+2 and Fe+3 salts were dissolved in ethanol by sonication and the gel formation was accomplished by adding propylene oxide. To this gel 10% (w/w) polymer microspheres were added and homogeneous mixture was fired rapidly in a quartz tubular furnace at 1000oC and quenched in air. The scanning electron microscopic (SEM) images of this ferrite foam material are presented in Figures 1a&b and the energy dispersive X-ray (EDX) mapping are shown in Figures 1c&d. Foam-like morphology with pore size of 1-20 mm was observed from the SEM images whereas EDX structure indicated the presence of Fe and Ni throughout the sample matrix. The BET surface area of this ferrite foam was 156 m2/g, which is higher than for Mn-Ni-ferrites reported in the literature. In preliminary experiments, H2 was generated by water-splitting reaction using Ni ferrite at 1000oC. Synthesis method, characterization, and transient H2 profiles obtained at various experimental conditions will be presented in detail.
Figure 1a) SEM image of NixFeyOz foam prepared by rapid firing in a tubular furnace and quenching, b) NixFeyOz foam at higher resolution, and c &d) x-ray mapping indicating Fe and Ni.
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