394472 Solar Fuel Production Via Thermochemical Dissociation of H2O/CO2 Via Ferrite Based Redox Reactions

Monday, November 17, 2014
Galleria Exhibit Hall (Hilton Atlanta)
Jamila Folady1, Dareen Dardor1, Shahd Gharbia1, Mehak Jilani1, LJP van den Broeke1, Anand Kumar1, Ivo Alxneit2 and Rahul Bhosale1, (1)Department of Chemical Engineering, Qatar University, Doha, Qatar, (2)Solar Technology Laboratory, Paul Scherrer Institute, Villigen PSI, Switzerland

Solar fuels (produced with the help of H2O, CO2, and solar energy as the raw materials) replacing fossil fuels is one of the most promising options to overcome the problems related to the continuously rising of oil prices, dependency of the world's energy economy on the abundance of fossil fuels, rapid depletion of the easily accessible oil reserves, and environmental problems caused by the CO2 induced greenhouse effect. One of the ways of producing solar fuels is by metal oxide based two-step solar thermochemical cycles. In these cycles, the first step consists of the endothermic reduction of a metal oxide at elevated temperatures releasing O2. The second step corresponds to the exothermic re-oxidation of the reduced metal oxide at lower temperatures by H2O, CO2, or a mixture of the two producing H2, CO, or syngas.

In this study, mixed ferrite based spinel redox materials were synthesized using sol-gel method. As-synthesized gels of mixed ferrites were dried and calcined upto different temperatures in air. Obtained calcined powders were characterized using various analytical techniques such as powder X-ray diffraction, BET surface area analysis, scanning (SEM) & transmission electron microscopy (TEM), and Inductively coupled plasma spectrometer (ICP). Synthesized mixed ferrites were further examined for their solar fuel production ability by performing multiple H2O and CO2 splitting cycles via thermal reduction/oxidation reactions. The obtained results indicate that the sol-gel derived mixed ferrites are capable towards producing high and constant levels of solar fuel in multiple thermochemical cycles. The results related to synthesis, characterization and solar fuel production experiments will be presented in detail.


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