Silver nanoparticle catalyzed reduction of aromatic nitro compounds
Silver nanoparticle catalyzed reduction of aromatic nitro compounds
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DOI：
10.1016/s0927-7757(01)01040-8
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发表时间：
2002-01-15
影响因子：
5.2
通讯作者：
Pal, T
中科院分区：
文献类型：
--
作者：
Pradhan, N;Pal, A;Pal, T
催化量的银金属纳米颗粒与NaBH 4的组合在水性介质中顺利地将芳香族硝基化合物还原成胺。原位形成的银纳米颗粒是活性催化剂。考虑到银金属纳米粒子的等离子体激元带，比较了在水溶液中与仍然生长的微电极（GME）和完全生长的微电极（FGME）银金属粒子反应的动力学参数。在水溶液中，反应遵循一级动力学与完全生长（FGME）的颗粒和零级动力学与仍在生长的颗粒（GME）。金属表面保持活性，并且在整个还原过程中活性保持不变。催化是由于有效的纳米粒子介导的电子转移从BH 4-离子的硝基化合物。以GME和FGME为催化剂，用NaBH_4还原2-硝基苯酚（2-NP）、4-硝基苯酚（4-NP）和4-硝基苯胺（4-NA）等硝基化合物，观察到它们的还原速率顺序为4-NP > 2-NP > 4-NA。(C)2002爱思唯尔科技有限公司。保留所有权利。
The combination of catalytic quantities of silver metal nanoparticles with NaBH4 smoothly reduces aromatic nitro compounds to amines in aqueous medium. Silver nanoparticles formed in situ are the active catalyst. The kinetic parameters of the reaction with still growing microelectrode (GME) and full grown microelectrode (FGME) silver metal particles in aqueous solution have been compared taking the plasmon band of the silver metal nanoparticles into consideration. In aqueous solution the reaction follows a first order kinetics with the full-grown (FGME) particles and zero order kinetics with the still growing particles (GME). The metal surface remains active and the activity remains unaltered throughout the course of the reduction. Catalysis was due to the efficient nanoparticle mediated electron transfer from BH4- ion to the nitro compounds. Nitro compounds like 2-nitrophenol (2-NP), 4-nitrophenol (4-NP) and 4-nitroaniline (4-NA) were tested with NaBH4 using both GME and FGME as catalyst and their rate of reduction has been observed to follow the sequence, 4-NP > 2-NP > 4-NA. (C) 2002 Elsevier Science B.V. All rights reserved.