期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 8, 期 2, 页码 535-539出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ee03431g
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资金
- U.S. National Science Foundation [CBET-1254351]
- Army Research Office DURIP program [61607-CH-RIP]
We report a perovskite promoted iron oxide as a highly effective redox catalyst in a hybrid solar-redox scheme for partial oxidation and water-splitting of methane. In contrast to previously reported ferrite materials, which typically exhibit 20% or lower steam to hydrogen conversion, La0.8Sr0.2FeO3-delta (LSF) promoted Fe3O4 is capable of converting more than 67% steam with high redox stability. Both experiments and a defect model indicate that the synergistic effect of reduced LSF and metallic iron phases is attributable to the exceptional steam conversion. To further enhance such a synergistic effect, a layered reverse-flow reactor concept is proposed. Using this concept, over 77% steam to hydrogen conversion is achieved at 930 degrees C, which is 15% higher than the maximum conversion predicted by the second law for unpromoted iron (oxides). When applied to the hybrid solar-redox scheme for liquid fuels and hydrogen co-generation, significant improvements in the energy conversion efficiency can be achieved with reduced CO2 emissions.
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