A screening study of the catalytic performance of ternary alloy nanoparticles containing nickel, iron and gallium supported on silica for methanol synthesis from CO₂ and H₂ was performed. Catalysts were prepared by incipient wetness impregnation and subsequently reduced in H₂ before catalytic testing. Ni₂FeGa showed the best performance of the tested catalysts in terms of methanol yield. An optimization of the preparation was done to improve activity and selectivity, reaching a performance close to that of commercially available Cu/ZnO/Al₂O₃/MgO at low reaction temperatures and pressure. Extensive in situ characterisation using environmental TEM, in situ XRD and in situ EXAFS of the formation of the Ni₂FeGa catalyst explains an optimal reduction temperature of 550 °C: warm enough that the three atomic species will form an alloy while cold enough to prevent the catalyst from sintering during the formation.

中文翻译：

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将Ni-Fe-Ga合金优化为Ni2FeGa以将CO2加氢为甲醇

进行了载有负载在二氧化硅上的镍，铁和镓的三元合金纳米粒子催化从CO ₂和H ₂合成甲醇的催化性能的筛选研究。通过初期湿润浸渍制备催化剂，然后在进行催化测试之前将其还原为H ₂。就甲醇产率而言，Ni ₂ FeGa显示出所测试催化剂的最佳性能。对制备方法进行了优化，以提高活性和选择性，使其性能接近市售的Cu / ZnO / Al ₂ O _3。/ MgO在低反应温度和压力下。使用环境TEM，Ni ₂ FeGa催化剂形成的原位XRD和原位EXAFS进行广泛的原位表征，可以说明最佳还原温度为550°C：足够温暖，这三个原子物种将形成合金，而足够冷，可以防止催化剂在成型过程中不会烧结。