284205 Thermally Stabilized Ferrite Nanoparticles for Hydrogen Generation From Thermochemical Water-Splitting Reaction

Wednesday, October 31, 2012: 9:20 AM
305 (Convention Center )
Xavier Pasala, Chemical and Bilogical, SDSMT, Rapid city, SD

Thermally Stabilized Ferrite Nanoparticles for Hydrogen Generation from Thermochemical Water-Splitting Reaction

X. Pasala, R.R. Bhosale, J. A. Puszynski, R. V. Shende*

Chemical and Biological Engineering,

South Dakota School of Mines and Technology,

Rapid City, SD 57701. Rajesh.Shende@sdsmt.edu

    Among several redox materials, ferrites show higher H2 volume generation at lower temperatures. Nominally phase pure ferrite materials were synthesized using sol-gel method and investigated for H2 generation from water-splitting reaction. Using sol-gel derived Ni-ferrite material, about 125 thermochemical cycles were performed for hydrogen generation where water-splitting and regeneration were performed at 700o-900oC and 1100oC, respectively. After performing 125 cycles, significant grain growth was observed during SEM analysis and this material exhibited very low specific surface area, <1 m2/g. As heterogeneous grain growth was observed after water-splitting reaction, it was considered important to investigate thermal stability of ferrite materials and mitigate their grain growth using ZrO2, Al2O3, Y2O3 and yttria-stabilized zirconia (YSZ) inhibitors. These inhibitors were mixed with Ni-ferrite nanoparticles (10-25 wt %) using vortex mixing and sonication. The materials thus obtained were analyzed using scanning electron microscopy (SEM), X-ray Diffraction (XRD) and BET (Brunauer-Emmett-Teller) surface area analyzer. The H2 generation ability of these ferrite nanomaterials was investigated by performing ten consecutive thermochemical cycles in the Inconel packed-bed reactor where water-splitting and regeneration were carried out at 700-900oC and 1100oC, respectively. In addition, during the regeneration step, oxygen was continuously monitored to understand the reaction stoichiometry. The results obtained on hydrogen generation using thermally stabilized ferrite materials in multiple thermochemical water-splitting cycles will be presented in detail.

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See more of this Session: Advances In Thermochemical Hydrogen Production
See more of this Group/Topical: 2012 International Congress on Energy (ICE)