It is highly desirable to develop inexpensive and highly selective catalyst for CO₂ hydrogenation to methanol and Cu/ZnO/Al₂O₃ is a promising formulation. Herein, we report the design and synthesis of a Cu-ZnO/Al₂O₃ catalyst via a bimetallic metal organic framework (MOF)-templated strategy (termed Cu-ZnO^MOF⊂Al₂O₃) and shed light on the role of the Cu-Zn@MOF precursor in this system for methanol synthesis. The developed Cu-ZnO^MOF⊂Al₂O₃ exhibited high methanol selectivity (86.9%) and methanol space-time yield (407.2 g_MeOH•kg_cat⁻¹•h⁻¹) at higher CO₂ conversion (9.1%) in comparison with the conventional Cu-ZnO^NO3/Al₂O₃ catalyst (79.6% and 209.0 g_MeOH•kg_cat⁻¹•h⁻¹, and 5.1%, respectively) at 240 ºC under 3.0 MPa. Spectroscopic characterization (TEM, XPS, EDX, in-situ DRIFTS) coupled with N₂O chemisorption and temperature-programmed desorption of CO₂ and H₂ revealed that the surface of the new Cu-ZnO^MOF⊂Al₂O₃ catalyst possesses higher Cu dispersion, surface-enriched ZnO and more Cu-ZnO interfacial sites, which leads to higher capability for CO₂ and H₂ adsorption and activation. These are considered to be the origin of higher methanol selectivity and enhanced activity of the catalyst prepared by the MOF-templated strategy for CO₂ hydrogenation. This work offers a novel approach to optimizing Cu-ZnO/Al₂O₃ catalyst for CO₂ hydrogenation to methanol.

开发用于将CO ₂加氢成甲醇的廉价且高选择性的催化剂是非常可取的，并且Cu/ZnO/Al ₂ O ₃是一种有前途的配方。在此，我们报告了通过双金属金属有机骨架 (MOF) 模板化策略（称为 Cu-ZnO ^MOF ⊂Al ₂ O ₃）设计和合成的 Cu-ZnO/Al ₂ O ₃催化剂，并阐明了催化剂的作用。该系统中用于甲醇合成的 Cu-Zn@MOF 前驱体。所开发的Cu-ZnO ^MOF ⊂Al ₂ O ₃表现出较高的甲醇选择性（86.9%）和甲醇时空产率（407.2 g _MeOH •kg_cat ^-1 •h ^-1 )与传统的 Cu-ZnO ^NO3 /Al ₂ O ₃催化剂（79.6% 和 209.0 g _MeOH •kg _cat ^-1 •h ^-1相比，CO ₂转化率更高（9.1%），和分别为 5.1%）在 240 ºC 和 3.0 MPa。结合 N ₂ O 化学吸附和 CO ₂和 H ₂的程序升温脱附的光谱表征（TEM、XPS、EDX、原位漂移）表明，新型 Cu-ZnO ^MOF ⊂Al ₂ O _{3 的表面}催化剂具有更高的Cu分散性、表面富集的ZnO和更多的Cu-ZnO界面位点，从而提高了对CO ₂和H _{2 的}吸附和活化能力。这些被认为是通过 MOF 模板化 CO ₂加氢策略制备的催化剂具有更高的甲醇选择性和增强的活性的原因。这项工作提供了一种优化用于 CO ₂加氢制甲醇的Cu-ZnO/Al ₂ O ₃催化剂的新方法。