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Chitosan supported Pd0 nanoparticles encaged in Al or Al-Fe pillared montmorillonite and their catalytic activities in Sonogashira coupling reactions
Applied Clay Science ( IF 5.6 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.clay.2020.105721
Jing Zhao , Xiu Zheng , Qi Liu , Mengdie Xu , Shuai Yang , Minfeng Zeng

Abstract In this study, the excellent chelating capability of chitosan (CS) and remarkable physical properties of Al or Al-Fe pillared montmorillonite (Mt) (i.e. high adsorption/diffusion capacity, thermal stability, and mechanical property, etc.) have been combined into a composite material to support Pd0 nanoparticles catalysts. The BET surface area of the resultant Pd0@CS/Al-Mt and Pd0@CS/Al-Fe-Mt were observed as 63.2 m2·g−1 and 109.7 m2·g−1, respectively. CS chains and Pd0 nanoparticles (sized up to 3 nm) were well encaged in the interlayer spaces of the pillared Mt. The resultant catalysts showed high catalytic efficiency and excellent stability for Sonogashira coupling reactions of aryl iodides or bromides with terminal aryl alkynes. It was found that the comprehensive properties of Pd0@CS/Al-Fe-Mt catalyst was higher than that of Pd0@CS/Al-Mt catalyst, which was mainly attributed to the higher specific surface area and smaller-sized Pd0 nanoparticles.

中文翻译:

壳聚糖负载的 Pd0 纳米颗粒包裹在 Al 或 Al-Fe 柱撑蒙脱石中及其在 Sonogashira 偶联反应中的催化活性

摘要 本研究结合了壳聚糖 (CS) 优异的螯合能力和铝或铝铁柱撑蒙脱石 (Mt) 的显着物理性能(即高吸附/扩散能力、热稳定性和机械性能等)。成复合材料以支撑 Pd0 纳米颗粒催化剂。观察到所得 Pd0@CS/Al-Mt 和 Pd0@CS/Al-Fe-Mt 的 BET 表面积分别为 63.2 m2·g-1 和 109.7 m2·g-1。CS 链和 PdO 纳米粒子(尺寸高达 3 nm)被很好地包裹在柱状 Mt 的层间空间中。所得催化剂对芳基碘化物或溴化物与末端芳基炔烃的 Sonogashira 偶联反应显示出高催化效率和优异的稳定性。
更新日期:2020-09-01
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