First Author:Junjie Zhou

Correspondence Author:Hong-bin Sun,Qionglin Liang

Co author:Yunong Li, Zhike Tang, Li Qi, Lei Liu, Yongjian Ai, Shuang Li, Zixing Shao

Journal:Green Chemistry

Issue:14

Volume:19

Impact Factor:9.3

DOI number:10.1039/c7gc00986k

Affiliation of Author(s):Department of Chemistry, Northeastern University

Teaching and Research Group:物理化学

Place of Publication:ENGLAND

Abstract:A core-shell structured nanocatalyst (Fe3O4@SiO2-NH2-RhNPs@mSiO(2)) that is encapsulated with porous silica has been designed and prepared for catalyzing the transfer hydrogenation of nitro compounds into corresponding amines. Rh nanoparticles serve as the activity center, and the porous silica shell plays an important role in the slow-release of the hydrogen source hydrazine. This reaction can be carried out smoothly in the green solvent water, and the atom economy can be improved by decreasing the amount of hydrazine hydrate used to a stoichiometric 1.5 equivalent of the substrate. Significantly, high catalytic efficiency is obtained and the turnover frequency (TOF) can be up to 4373 h(-1) in the reduction of p-nitrophenol (4-NP). A kinetics study shows that the order of reaction is similar to 0.5 towards 4-NP, and the apparent active energy E-a is 58.18 kJ mol(-1), which also gives evidence of the high catalytic efficiency. Additionally, the excellent stability of the catalyst has been verified after 15 cycles without any loss of catalytic activity, and it is easily recovered by a magnet after reaction due to the Fe3O4 nucleus.

Key Words:Aromatic Nitro-Compounds;chemoselective Transfer Hydrogenation;Oxide Hydroxide Catalyst; Cross-Coupling Reactions;Room-Temperature;Microwave Irradiation;Nitrophenol Reduction;Nickel Nanoparticles;Supported Hydrazine;Recyclable Catalyst

Document Code:WOS:000405685000023

Discipline:Natural Science

First-Level Discipline:Chemistry

Page Number:3400-3407

ISSN No.:1463-9262

Translation or Not:no