The RWGS reaction represents a direct approach for gas-phase CO₂ upgrading. This work showcases the efficiency of Fe/CeO₂-Al₂O₃ catalysts for this process, and the effect of selected transition metal promoters such as Cu, Ni and Mo. Our results demonstrated that both Ni and Cu remarkably improved the performance of the monometallic Fe-catalyst. The competition Reverse Water-Gas Shift (RWGS) reaction/CO₂ methanation reaction was evident particularly for the Ni-catalyst, which displayed high selectivity to methane in the low-temperature range. Among the studied catalysts the Cu promoted sample represented the best choice, exhibiting the best activity/selectivity balance. In addition, the Cu-doped catalyst was very stable for long-term runs – an essential requisite for its implementation in flue gas upgrading units. This material can effectively catalyse the RWGS reaction at medium-low temperatures, providing the possibility to couple the RWGS reactor with a syngas conversion reaction. Such an integrated unit opens the horizons for a direct CO₂ to fuels/chemicals approach.

RWGS反应代表了气相CO ₂提纯的直接方法。这项工作展示了Fe / CeO ₂ -Al ₂ O ₃催化剂在该过程中的效率，以及选定的过渡金属助催化剂（例如Cu，Ni和Mo）的作用。单金属铁催化剂。竞争性逆水煤气变换（RWGS）反应/ CO ₂甲烷化反应对于镍催化剂尤其明显，它在低温范围内显示出对甲烷的高选择性。在研究的催化剂中，Cu促进的样品代表了最佳选择，表现出最佳的活性/选择性平衡。此外，掺杂铜的催化剂在长期运行中非常稳定，这是在烟气提纯装置中实施该催化剂的必要条件。这种材料可以在中低温下有效催化RWGS反应，从而使RWGS反应器与合成气转化反应偶联。这样的集成单元为直接将CO ₂引入燃料/化学品方法开辟了前景。