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首页> 外文期刊>ACS applied materials & interfaces >Controlled Encapsulation of Flower-like Rh-Ni Alloys with MOFs via Tunable Template Dealloying for Enhanced Selective Hydrogenation of Alkyne
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Controlled Encapsulation of Flower-like Rh-Ni Alloys with MOFs via Tunable Template Dealloying for Enhanced Selective Hydrogenation of Alkyne

机译：通过可调模板脱合金用MOFs来控制花状Rh-Ni合金的包封，以增强炔烃的选择性加氢

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摘要

For new composite materials with functional nanoparticles (NPs) embedded in metal organic frameworks (MOFs), rational design and precise control over their architectures are imperative for achieving enhanced performance and novel functions. Especially in catalysis, the activity and selectivity of such composite materials are strongly determined by the encapsulation state and thickness of the MOF shell, which greatly influences the diffusion and adsorption of substance molecules onto the NP surface. In this study, MOF-74(Ni)-encapsulated Rh-Ni hierarchical heterostructures (Rh-Ni@MOF-74(Ni)) were successfully constructed using magnetic Rh-Ni-alloyed nanoflowers (NFs) as a self-sacrificial template. Strikingly, the encapsulation state and thickness of the formed MOF shell were well-tuned via template dealloying by changing the Ni content in the Rh-Ni NFs template. More interestingly, such unique Rh-Ni composites encapsulated with MOFs as catalysts could be magnetically recyclable and exhibited enhanced catalytic performance for the selective hydrogenation of alkynes to cis products, owing to the confinement effect of the MOF shell, as compared to their pristine counterparts.
机译：对于具有嵌入金属有机框架（MOF）中的功能纳米颗粒（NP）的新型复合材料，必须合理设计并对其结构进行精确控制，才能获得增强的性能和新颖的功能。特别是在催化中，这种复合材料的活性和选择性强烈取决于MOF壳的包封状态和厚度，这极大地影响了物质分子在NP表面的扩散和吸附。在这项研究中，成功​​地使用磁性Rh-Ni合金纳米花（NFs）作为自牺牲模板，成功构建了MOF-74（Ni）封装的Rh-Ni分层异质结构（Rh-Ni @ MOF-74（Ni））。令人惊讶的是，通过改变Rh-Ni NFs模板中的Ni含量，通过模板脱合金，可以很好地调节所形成的MOF壳的封装状态和厚度。更有趣的是，由于MOF壳层的限制作用，与​​MON相比，这种独特的用MOF封装的独特Rh-Ni复合材料可以被磁性回收，并表现出增强的催化性能，可将炔烃选择性氢化为顺式产物。

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