The Suzuki-Miyaura reaction is one of the most effective routes for the construction of carbon–carbon bonds, due to the obvious advantages of mild reaction conditions, wide range of functional group tolerance, simplicity of operation, and environmental friendliness. However, these reactions highly depend on the development of the active and stable catalysts. Herein, the hollow hexagonal prismatic silicalite-1 (HS-1) zeolite-supported palladium nanoparticles (Pd NPs) were synthesized and applied as a catalyst in Suzuki-Miyaura reaction. The experimental results show that 2.0Pd/HS-1 is an efficient and stable catalyst, which can achieve a high conversion rate (>99.9 %) in a short time (45 min) and can be recycled. Further studies show that 2.0Pd/HS-1 has abundant mesopores, which are favorable for exposing more active sites and promoting the transfer of reactants around the catalysts, thus improving the contact opportunities between the catalysts and the feedstock. Moreover, its proper acid sites as well as metal-zeolite interactions can modulate the electronic state of Pd, and thus improve the conversion of bromobenzene. This work provides new insights into the design, synthesis and applications of highly efficient hollow silicalite-1 zeolite loaded metal catalysts.

中文翻译：

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多级孔 Pd/HS-1 沸石作为 Suzuki-Miyaura 反应的高效且可重复使用的催化剂

铃木-宫浦反应具有反应条件温和、官能团耐受范围广、操作简单、环境友好等明显优点，是构建碳碳键最有效的途径之一。然而，这些反应高度依赖于活性和稳定催化剂的开发。在此，合成了空心六方棱柱硅沸石-1（HS-1）沸石负载的钯纳米颗粒（Pd NPs），并将其用作铃木-宫浦反应的催化剂。实验结果表明，2.0Pd/HS-1是一种高效、稳定的催化剂，可在短时间内（45 min）实现较高的转化率（>99.9%），且可循环利用。进一步的研究表明，2.0Pd/HS-1具有丰富的介孔，有利于暴露更多的活性位点，促进反应物在催化剂周围的转移，从而改善催化剂与原料之间的接触机会。此外，其适当的酸位以及金属-沸石相互作用可以调节Pd的电子态，从而提高溴苯的转化率。这项工作为高效空心silicalite-1沸石负载金属催化剂的设计、合成和应用提供了新的见解。