Fabrication of magnetically separable ruthenium nanoparticles decorated on channelled silica microspheres: Efficient catalysts for chemoselective hydrogenation of nitroarenes,Dalton Transactions

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Fabrication of magnetically separable ruthenium nanoparticles decorated on channelled silica microspheres: Efficient catalysts for chemoselective hydrogenation of nitroarenes
Dalton Transactions ( IF 3.5 ) Pub Date : 2021-09-07 , DOI: 10.1039/d1dt01665b
Gauravjyoti D Kalita ₁ , Manash R Das ₂ , Pankaj Das ₁

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Fe₃O₄–SiO₂ microspheres were synthesized by a three-step synthetic procedure involving silica coating, surface capping, and surface modification. These magnetic mesoporous microspheres were employed as sorbents for the incorporation of ultrasmall Ru nanoparticles (2–5 nm) followed by thermal aggregation of the microspheres for achieving better heterogeneity and low leaching. The Ru decorated Fe₃O₄–SiO₂ microspheres (Ru@Fe₃O₄–CSM) were applied as chemoselective catalysts to convert more than 20 substituted nitroarenes to corresponding amines with good-to-excellent conversion (77–99%) and selectivity (70–100%) under mild conditions; the catalyst can be magnetically recovered within a frame of 90s (recovery time-lapse) and reused up to 5 times without significant decrease in activity or selectivity. Magnetic hysteresis studies were performed to elucidate the magnetic behavior of the ruthenium decorated materials.

中文翻译：

修饰在通道二氧化硅微球上的磁性可分离钌纳米粒子的制备：硝基芳烃化学选择性氢化的有效催化剂

Fe ₃ O ₄ -SiO ₂微球是通过三步合成程序合成的，包括二氧化硅涂层、表面封端和表面改性。这些磁性介孔微球被用作吸附剂，用于掺入超小 Ru 纳米粒子（2-5 nm），然后微球的热聚集以实现更好的异质性和低浸出。Ru修饰的Fe ₃ O ₄ –SiO ₂微球（Ru@Fe ₃ O ₄-CSM) 用作化学选择性催化剂，在温和条件下将 20 多种取代硝基芳烃转化为相应的胺，转化率 (77-99%) 和选择性 (70-100%) 良好；该催化剂可以在 90 秒（恢复延时）的框架内磁性回收，最多可重复使用 5 次，而不会显着降低活性或选择性。进行磁滞研究以阐明钌装饰材料的磁性行为。

更新日期：2021-09-08

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