Figure 8. Schematic representation of the superdry re-forming process. In the CH4 oxidation step, Ni catalyzes the CO2 re-forming of CH4 into syngas, Fe3O4 is reduced by syngas with formation of CO2 and H2O, and carbonation of CaO yields in situ CO2 removal. Overall, CH4 is oxidized into CO2 and H2O, Fe3O4 has been reduced to Fe and CaCO3 has been formed from CaO and CO2. The CO2 reduction step consists of CaCO3 decomposition into CaO and CO2 and Fe oxidation to Fe3O4 through the reduction of CO2 into CO. Reprinted with permission from ref 159. Copyright 2016 AAAS.
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