A new catalyst of Co/La₄Ga₂O₉ for CO₂ hydrogenation to produce ethanol was prepared by reducing LaCo_0.5Ga_0.5O₃, which showed excellent selectivity to ethanol (≈35C-mol%) at mild reaction conditions (270 °C, 3.5 MPa, 3000 mL g⁻¹ h⁻¹). The catalysts were characterized by N₂ adsorption/desorption, XRD, XAFS, CO and CO₂-TPD, H₂ chemisorption, XPS and TEM techniques. The interaction between Co nanoparticles (NPs) and La₄Ga₂O₉ oxide resulted in Co⁰-Co²⁺ on the surface of Co NPs. It was proposed that La₄Ga₂O₉ could catalyze reverse water gas shift reaction (r-WGS), which converted CO₂ to CO. Then, the CO migrated to Co⁰-Co²⁺ on Co NPs, where it was hydrogenated to form ethanol like higher alcohols synthesis from syngas. The results suggest that by controlling the oxidation state of cobalt, and combined with a kind of active site for activating CO₂ to form CO, a catalyst with excellent selectivity to ethanol could be obtained for CO₂ hydrogenation, which means that the complex reaction may be proceed with high selectivity using only one active metal component.

通过还原LaCo _0.5 Ga _0.5 O ₃制备了一种用于Co ₂加氢生产乙醇的Co / La ₄ Ga ₂ O ₉新型催化剂，该催化剂在温和的反应条件下（270°C）对乙醇具有优异的选择性（≈35C-mol％）。 C，3.5MPa，3000mL g ^-1 h ^-1）。通过N ₂吸附/解吸，XRD，XAFS，CO和CO ₂ -TPD，H ₂化学吸附，XPS和TEM技术对催化剂进行了表征。Co纳米颗粒（NPs）与La ₄ Ga ₂ O ₉氧化物之间的相互作用导致CoCo NPs表面的⁰ -Co ²⁺。有人提出La ₄ Ga ₂ O ₉可以催化水煤气变换反应（r-WGS），将CO ₂转化为CO。然后，CO在Co NPs上迁移到Co ⁰ -Co ²⁺进行氢化。形成乙醇，就像合成气合成高级醇一样。结果表明，通过控制钴的氧化态，并用一种活性位点的结合，用于激活CO ₂，以形成CO，具有优良的对乙醇的选择性的催化剂对CO可以得到₂ 氢化，这意味着仅使用一种活性金属组分就可以以高选择性进行复杂的反应。