FeO_x–CeO_2−y composites with different homogeneities were synthesized by the solvothermal method, co-precipitation, and physical mixing. FeO_x and CeO_2−y in the composites synthesized by the solvothermal method and co-precipitation were homogeneously mixed at the nanometer scale, but physical mixing afforded heterogeneously agglomerated composites. The effects of the homogeneity of the composites were evaluated by probe reverse water-gas shift (RWGS) reaction. The improved homogeneity of FeO_x and CeO_2−y in the composites resulted in higher catalytic activity, product selectivity, and long-term stability in the RWGS reaction at 700 °C. The redox behavior of FeO_x was enhanced by finely combined CeO_2−y in the case of solvothermally prepared FeO_x–CeO_2−y, which exhibited excellent crystal structure stability. This study demonstrates the advantages of using the solvothermal method in obtaining homogeneous composites containing multiple metal oxides.

采用溶剂热法、共沉淀法和物理混合法合成了不同均质性的FeO _x –CeO _{2− y}复合材料。通过溶剂热法和共沉淀合成的复合材料中的FeO _x和CeO _{2− y}在纳米尺度上均匀混合，但物理混合提供了不均匀团聚的复合材料。通过探针逆水煤气变换（RWGS）反应评估复合材料均匀性的影响。复合材料中FeO _x和CeO _{2− y}均匀性的改善导致700 °C RWGS 反应具有更高的催化活性、产物选择性和长期稳定性。在溶剂热制备的FeO _x –CeO _{2− y}的情况下，精细结合的CeO _{2− y}增强了FeO _x的氧化还原行为，表现出优异的晶体结构稳定性。这项研究证明了使用溶剂热法获得含有多种金属氧化物的均质复合材料的优势。