Abstract
A novel solar-two-step thermochemical concept for continuous production of H\(_2\) or CO from solar energy and H\(_2\)O or CO\(_2\) using the redox pair MOFe\(_2\)O\(_3\)/MO as reactive particles is proposed and assessed. Here, an efficient continuous separation mechanism is devised by the use of an external magnetic field and the weak magnetization of MOFe\(_2\)O\(_3\) at the working temperatures. The mechanism is suitable for systems of ferrites with a Curie temperature in the range 500–800 \(^{\circ }\)C where water or CO\(_2\) decomposition occurs. One of the most promising candidates is the Fe\(_3\)O\(_4\)/FeO system. Pyromagnetic coefficients for Fe\(_3\)O\(_4\) were obtained experimentally. A simple magnetic trap was employed and the separation ratios Fe\(_3\)O\(_4\)/FeO were obtained. The results are encouraging and motivate the development of full-scale solar reactor prototypes.
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