A series of bimetallic CuCo catalysts were synthesized through different preparation strategies and evaluated for ethanol and higher alcohol synthesis from syngas. The optimal CuCo catalyst, which has a Cu/Co ratio of 2/1, was derived from introducing Cu and Co elements at the same time into the layered double hydroxide (LDH) precursor. The uniformly dispersed CuCo catalyst with a small particle size exhibited markedly improved catalytic activity and ethanol selectivity (34.3%) with a narrow alcohol distribution of C₁–C₃ mixed alcohols (90.6%). As revealed by HAADF-STEM and in situ FTIR spectroscopy, the superior mixing of Cu and Co species exhibited a higher probability of CO bound in bridging geometries to neighboring metallic Co atoms, which was beneficial to enhance the amount of CH_x intermediates. Moreover, the optimal CuCo catalyst exhibited a large specific surface area and an enrichment of copper. Meanwhile, temperature programmed surface reaction (TPSR) confirmed the weak hydrogenation probability of CH_x to produce CH₄ over the homogeneous dispersion of the CuCo catalyst, indicating that more CH_x intermediates were utilized to produce ethanol.

中文翻译：

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双金属铜-钴纳米片的协同催化直接从合成气中合成乙醇和高级醇†

通过不同的制备策略合成了一系列双金属CuCo催化剂，并评估了合成气中乙醇和高级醇的合成。Cu / Co比为2/1的最佳CuCo催化剂是通过将Cu和Co元素同时引入到层状双氢氧化物（LDH）前体中而得出的。具有小粒径的均匀分散的CuCo催化剂具有显着改善的催化活性和乙醇选择性（34.3％），且C ₁ -C ₃混合醇的醇分布窄（90.6％）。所揭示的HAADF-STEM和原位FTIR光谱显示，Cu和Co物种的优异混合表现出将桥接几何结构与相邻的金属Co原子键合的CO的可能性更高，这有利于增加CH _x中间体的数量。而且，最佳的CuCo催化剂表现出大的比表面积和铜的富集。同时，程序升温表面反应（TPSR）证实了与CuCo催化剂的均匀分散相比，CH _x产生CH _4的氢化可能性弱，表明使用了更多的CH _x中间体生产乙醇。