Magnesioferrites for Solar Thermochemical Fuel Production
Solar energy(2018)
摘要
Solid solutions of iron oxide in MgO, prepared using the solid state reaction method (SSR), were investigated for solar thermochemical water splitting/carbon dioxide splitting (STC-WS/CDS). Experimental results show that 20 mole% magnetite (Fe3O4) in MgO has a hydrogen (H-2) production capacity of 6.12 +/- 0.22 cm(3) g(total material)(-1) when thermally reduced at 1450 degrees C (T-red) under an inert environment and oxidized at 1200 degrees C (T-ox) with excess steam. This compares favorably with cerium dioxide (CeO2), which has proven to be an excellent STC-WS/CDS material, with H-2 production 2.91 +/- 0.15 cm(3) g(total material)(-1) at T-red = 1450 degrees C and T-ox = 1200 degrees C, and 4.34 +/- 0.2 cm(3) g(total material)(-1) at T-red = 1500 degrees C and T-ox = 1200 degrees C. 20 mole% Fe3O4 in MgO has advantages of lower operating temperature and higher production capacity. The partial pressure of oxygen (P-o2) during thermal reduction is on the order of 10(-4) atm, which can be achieved using existing industrial vacuum pump technology. These advantages make this material a viable option for further study in solar thermochemical fuel production applications.
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关键词
Thermochemical fuel production,Recyclability,Magnesium oxide doping,Sintering inhibiter
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