Fe-based catalysts have strong oxygen carrier abilities and have been used for ICCU-DRM. The catalysts were mixed with CaO for ICCU-DRM research. The method of preparing Fe-based catalysts is below (https://doi.org/10.1021/acs.iecr.9b05783):
“All the Fe-based oxygen storage materials were prepared by a coprecipitation synthesis method. The stoichiometric quantities of Fe(NO3)3·9H2O and Al(NO3)3·9H2O were dissolved in the deionized water to form a homogeneous solution. After ultrasonic treatment for 30 min, concentrated ammonia was added into the solution to adjust the pH value to around 9–10 and the solution was stirred under 80 °C for 5 h. Then, the suspension was placed in a vacuum oven and dried overnight at 80 °C. The solid product was ground and calcined in the muffle furnace at 400 °C for 2 h, 600 °C for 2 h, and 950 °C for 6 h. Finally, all the as-prepared Fe-based oxygen storage materials were physically mixed with the proper proportion of CO2 sorbents (i.e., CaCO3, analytical reagent) by grinding for 30 min to obtain the solid materials for redox and reforming reactions.”