Gold nanoparticles stabilized on nanocrystalline magnesium oxide as an active catalyst for reduction of nitroarenes in aqueous medium at room temperature
Gold nanoparticles stabilized on nanocrystalline magnesium oxide as an active catalyst for reduction of nitroarenes in aqueous medium at room temperature
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DOI：
10.1039/c2gc35917k
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发表时间：
2012-01-01
期刊：
影响因子：
9.8
通讯作者：
Maheswaran, H.
中科院分区：
文献类型：
--
作者：
Layek, Keya;Kantam, M. Lakshmi;Maheswaran, H.
在室温条件下，纳米氧化镁表面沉积的金纳米颗粒是一种非常有效的水中硝基芳烃还原催化剂。硼氢化钠用作还原硝基的氢源。该催化体系在不需要任何启动子的情况下，即使在其他敏感官能团存在的情况下，也能在非常温和的条件下选择性地还原硝基，收率很高。采用紫外可见分光光度法研究了4-硝基苯酚还原为4-氨基苯酚的反应动力学，测定了其表观速率常数，并与其他负载型金催化剂进行了比较。废的多相催化剂通过简单的离心回收，并重复使用多次循环。
Gold nanoparticles deposited on nanocrystalline magnesium oxide is a very efficient catalyst for the reduction of nitroarenes in aqueous medium at room temperature. Sodium borohydride is used as the source of hydrogen for the reduction of nitro groups. This catalytic system selectively reduces the nitro group even in the presence of other sensitive functional groups under very mild conditions in good to excellent yields without the requirement of any promoters. The reaction kinetics of reduction of 4-nitrophenol to 4-aminophenol has been studied by UV-visible spectrophotometry, and its apparent rate constant has been determined and compared with those of other supported gold catalysts. The spent heterogeneous catalyst is recovered by simple centrifugation, and reused for multiple cycles.