Thermodynamic evolution of magnetite oxygen carrier via chemical looping reforming of methane

The behavior of chemical looping reforming of methane over the magnetite oxygen carrier (OC) has been investigated by thermodynamic analysis and experiments, which clarified the appropriate operating conditions and material composition. The possible revolution of the reaction composition and the corresponding isothermal redox reactions also have been carried out. Compared with the effect of temperature rise (800-1000 degrees C) on the formation of carbon deposition, it is more conducive to the reduction of iron oxide. In the oxidation stage, the temperature of 400-650 degrees C is favorable for inhibiting the formation of C and Fe3C, which greatly influenced the quality of hydrogen production. The compounds such as FeTiO3, FeTi2O5 and Fe2TiO5 can be regenerated by water vapor. However, FeAl2O4 and MgFe2O4 are irreversible, resulting in the loss of reducible iron species. Equilibrium composition study revealed that syngas with an ideal ratio of (H-2/CO = 2) can be obtained at a temperature higher than 900 degrees C, while the carbon deposition has been inhibited. Both the thermodynamic analysis and experiment showed that the chemical thermodynamics analysis method is a leading approach for the reaction characteristic studies of chemical looping reforming of methane.

Automated summary

The behavior of chemical looping reforming of methane over the magnetite oxygen carrier has been studied through thermodynamic analysis and experiments, revealing the importance of appropriate operating conditions and material composition. The study showed that higher temperatures are favorable for desired syngas production, while inhibiting carbon deposition. The research highlighted the significance of thermodynamic analysis in studying the reaction characteristics of chemical looping reforming of methane.