Coal-based electricity generation surged 22% in 2021 versus 2019 in the USA due to high natural gas prices and ease of transportation. This contradicts societies desire to produce clean energy and underscores the urgency to develop technologies to capture atmospheric CO₂ and produce value-added products. The reverse water gas shift (RWGS) converts CO₂ to CO, which is a basic intermediate for the chemical and petrochemical industries. Fe is the prime catalyst metal for this reaction and here we compare the activity of Fe clusters and 5 nm FeO_x nanoparticles deposited on Cu/Al₂O₃. The catalytic activity towards the RWGS increases as a function of Fe doping. Fe clusters doping are non-uniform in size on Cu/Al₂O₃, whereas FeO_x nanoparticles synthesized with the polyol method are uniform and well-dispersed on the Cu surface. The interaction between Cu and FeO_x establishes a dual catalyst where FeO_x and Cu activate CO₂ and H₂, respectively, an effect that is functionally equivalent to the metal-support interaction phenomenon. Furthermore, FeO_x on Cu/Al₂O₃ (0.009 g g⁻¹ of Fe) converts 2-times more CO₂ than un-doped Cu/Al₂O₃ with a CO selectivity > 99%. Our method provides a technique to dope synthesized catalysts with nanoparticles to enhance their catalytic activity, selectivity and stability.

由于天然气价格高企和交通便利，与 2019 年相比，2021 年美国的煤炭发电量增长了 22%。这与社会生产清洁能源的愿望相矛盾，并强调了开发捕获大气 CO ₂和生产增值产品的技术的紧迫性。反向水煤气变换 (RWGS) 将 CO ₂转化为 CO，CO 是化学和石化工业的基本中间体。Fe 是该反应的主要催化剂金属，在这里我们比较了 Fe 簇和沉积在 Cu/Al ₂ O _{3上的 5 nm FeO x}纳米粒子的活性。对 RWGS 的催化活性随着 Fe 掺杂的增加而增加。Fe 簇掺杂在 Cu/Al 上的尺寸不均匀₂ O ₃，而用多元醇法合成的FeO _x纳米颗粒均匀且分散在Cu表面上。_{Cu和FeO x}之间的相互作用建立了双催化剂，其中FeO _x和Cu分别活化CO ₂和H ₂，这种作用在功能上等同于金属-载体相互作用现象。此外， Cu/Al ₂ O ₃上的 FeO _x (0.009 g g ^{-1的 Fe) 转化的 CO} ₂是未掺杂的 Cu/Al ₂ O ₃的2 倍CO 选择性 > 99%。我们的方法提供了一种用纳米粒子掺杂合成催化剂以提高其催化活性、选择性和稳定性的技术。