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Direct hydrogenation and one-pot reductive amidation of nitro compounds over Pd/ZnO nanoparticles as a recyclable and heterogeneous catalyst

机译:Pd / ZnO纳米粒子上硝基化合物的直接加氢和一锅还原酰胺化反应

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摘要

A novel Pd supported on ZnO nanoparticles was readily synthesized and characterized. The amount of palladium on ZnO is 9.84 wt% which was determined by ICP analysis and atomic absorption spectroscopy (AAS). Percentage of accessible Pd as active catalyst is also estimated to 2.72% based on the thermogravimetric (TG) analysis. This nano-sized Pd/ZnO with an average particle size of 20-25 nm and specific surface area 40.61 m(2) g(-1) was used as a new reusable heterogeneous catalyst for direct hydrogenation and one-pot reductive amidation of nitro compounds without the use of any ligands under atmospheric pressure. The catalyst can be recovered and recycled several times without marked loss of activity. (C) 2014 Elsevier B.V. All rights reserved.
机译:负载在ZnO纳米颗粒上的新型Pd易于合成和表征。 ZnO上的钯含量为9.84 wt%,这是通过ICP分析和原子吸收光谱法(AAS)确定的。根据热重(TG)分析,作为活性催化剂的可及钯的百分比也估计为2.72%。这种纳米级的Pd / ZnO具有20-25 nm的平均粒径和40.61 m(2)g(-1)的比表面积,被用作新的可重复使用的非均相催化剂,用于硝基的直接氢化和一锅还原酰胺化在大气压下不使用任何配体的化合物。催化剂可以被回收和再循环几次而没有明显的活性损失。 (C)2014 Elsevier B.V.保留所有权利。

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