The catalysis of CO₂ to light olefins (C₂⁼–C₄⁼) utilizing Fe–Co bimetallic catalysts is deemed a practicable approach to counteract the excessive emission of CO₂. However, a significant research gap exists in the study of manipulating the interaction between Fe–Co alloys, particularly in terms of component control. In this work, a range of bimetallic catalysts with varying Co/Fe molar ratios supported on ZrO₂ were obtained through pyrolysis of mixed metal organic framework NH₂-MIL-88B(Fe/Co)@UiO-66 that enables the hydrogenation of CO₂ to C₂⁼–C₄⁼. Notably, the catalyst 10Fe1Co@ZrO₂ exhibited a C₂⁼–C₄⁼ selectivity of 45% at a CO₂ conversion of 44.6%. The characterization results authenticate that, compared to the bare Fe catalyst, introducing Co significantly enhances the CO₂ adsorption and conversion. Intriguingly, CoFe₂O₄ formed in both 10Fe1Co@ZrO₂ and 5Fe1Co@ZrO₂ undergoes reduction to generate Co_xFe_y, facilitating its subsequent carbonization into the active phase χ-(Co_xFe_1–x)₅C₂ more readily during the reaction process.

中文翻译：

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MOFs衍生的Fe-Co双金属催化剂，用于选择性CO2加氢制轻质烯烃


利用 Fe-Co 双金属催化剂将 CO₂ 催化成轻烯烃 （C₂⁼–C₄⁼） 被认为是抵消 CO₂ 过量排放的可行方法。然而，在操纵 Fe-Co 合金之间相互作用的研究中存在重大研究空白，尤其是在成分控制方面。在本工作中，通过混合金属有机框架 NH 2-MIL-88B（Fe/Co）@UiO-66 的热解，获得了一系列负载在 ZrO₂ 上具有不同 Co/Fe 摩尔比的双金属催化剂，使 CO₂ 能够加氢为 C₂⁼–C₄⁼。值得注意的是，催化剂 10Fe1Co@ZrO₂ 在 CO₂ 转化率为 44.6% 时表现出 45% 的 C₂⁼–C₄⁼ 选择性。表征结果证明，与裸 Fe 催化剂相比，引入 Co 可显著提高 CO₂ 的吸附和转化率。有趣的是，在 10Fe1Co@ZrO₂ 和 5Fe1Co@ZrO₂ 中形成的 CoFe₂O₄ 经过还原生成 Co_xFe_y，从而促进其随后在反应过程中更容易碳化成活性相 χ-（Co_xFe_1–x）₅C₂。