Abstract In attempt to take advantages of naturally occurring compounds for the catalysis, a novel composite composed of β-cyclodextrin, dendrimer and bentonite clay is fabricated and utilized as a support for the stabilization of Pd nanoparticles. To prepare the support, bentonite is amino functionalized and then successively reacted with 2,4,6-trichloro-1,3,5-triazine and ethylenediamine to furnish a dendrimer of generation II on bentonite. Afterwards, the terminal functionalities of the dendrimer were adorned with cyclodextrin. Bentonite played role in the heterogenation of the catalyst and improvement of the stability of the composite while, cyclodextrins served as molecular shuttles and capping agent for the as-prepared Pd nanoparticles. Dendrimer with multi nitrogen atoms, on the other hand, improved Pd anchoring through electrostatic interactions. The catalyst was applied for the hydrogenation of nitroarenes under mild reaction condition in aqueous media in a selective manner. Notably, the catalyst could be recovered and reused repeatedly.

中文翻译：

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β-环糊精和膨润土的复合物：Pd 固定化的有前景的载体和在温和反应条件下开发硝基芳烃加氢催化剂

摘要 为了利用天然存在的化合物进行催化，制备了一种由 β-环糊精、树枝状大分子和膨润土组成的新型复合材料，并将其用作稳定 Pd 纳米颗粒的载体。为制备载体，将膨润土氨基官能化，然后依次与 2,4,6-三氯-1,3,5-三嗪和乙二胺反应，在膨润土上生成第二代树枝状聚合物。之后，树枝状聚合物的末端官能团用环糊精装饰。膨润土在催化剂的异质化和提高复合材料的稳定性方面发挥了作用，而环糊精作为分子穿梭剂和制备的 Pd 纳米粒子的封端剂。另一方面，具有多个氮原子的树枝状聚合物，通过静电相互作用改善 Pd 锚定。该催化剂在温和的反应条件下，在水性介质中选择性地应用于硝基芳烃的加氢反应。值得注意的是，催化剂可以回收和重复使用。