A novel scheme is designed to prepare superior catalysts with good activity, high selectivity, outstanding stability, excellent resistance to sintering and carbon deposition. In the scheme, the ions of lanthanum, strontium, cobalt, and gallium were confined into La_1–xSr_xCo_0.65Ga_0.35O₃ with perovskite structure and uniformly dispersed at the atomic level; by reducing La_1–xSr_xCo_0.65Ga_0.35O₃, a strong interaction between the active sites and promoters exists, and good catalytic performance for direct ethanol synthesis (DES) can be obtained. According to the design scheme, a series of La_1–xSr_xCo_0.65Ga_0.35O₃ (x = 0–0.4) and La_0.7Sr_0.3CoO₃ (LSC) catalysts were prepared by citric acid complexation method and characterized by XRD, H₂-TPD, TPR, TEM, BET, XPS, and TG techniques. Thanks to the excellent catalyst design scheme, the catalyst reduced from La_0.7Sr_0.3Co_0.65Ga_0.35O₃ showed good activity, high selectivity, and excellent stability for DES. Simultaneously, this catalyst design scheme can be extended to the design of other catalysts.

中文翻译：

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合成气直接合成乙醇的混合氧化物受限和定制钴纳米催化剂：以钙钛矿型氧化物为前驱体的催化剂设计

设计了一种新颖的方案以制备具有良好活性，高选择性，出色的稳定性，优异的抗烧结性和碳沉积性的优良催化剂。在该方案中，镧，锶，钴和镓的离子被限制在钙钛矿结构的La _{1– x} Sr _x Co _0.65 Ga _0.35 O _3中，并在原子级上均匀分散。通过减少La _{1– x} Sr _x Co _0.65 Ga _0.35 O ₃，活性位点与促进剂之间存在强相互作用，并且可以获得直接乙醇合成（DES）的良好催化性能。根据设计方案，通过柠檬酸络合法制备了一系列La _{1– x} Sr _x Co _0.65 Ga _0.35 O ₃（x = 0–0.4）和La _0.7 Sr _0.3 CoO ₃（LSC）催化剂，并进行了XRD表征。 ，H ₂ -TPD，TPR，TEM，BET，XPS和TG技术。得益于出色的催化剂设计方案，催化剂从La _0.7 Sr _0.3 Co _0.65 Ga还原_0.35 O ₃对DES表现出良好的活性，高的选择性和极好的稳定性。同时，该催化剂设计方案可以扩展到其他催化剂的设计。