Fabrication of Co(OH)₂ coated Pt nanoparticles as an efficient catalyst for chemoselective hydrogenation of halonitrobenzenes

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• 作者：Haiyang Cheng^a ; ^b ; Xiangchun Meng^a ; Qiang Wang^a ; Jun Ming^a ; Yancun Yu^a ; ^b ; Fengyu Zhao^a ; ^b ; ^{zhaofy@ciac.jl.cn}
• 关键词：Platinum nanoparticles ; Co(OH)2 ; Chemoselective hydrogenation ; Halonitrobenzene ; Haloaniline
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 期刊代码：125_00219797
• 类别：ch
• 出版时间：1 July, 2012
• 卷：377
• 期：1
• 页码：322-327
• 文件大小：894 K

摘要

Co(OH)₂ coated platinum nanoparticles Pt/Co(OH)₂ were prepared by microwave assistance and hydrothermal method, and the prepared samples were composed of Pt nanoparticles with an average size of 1.8 nm coated uniformly in the thin Co(OH)₂ leaves based on the results of X-ray diffraction, transmission electron microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy. The Pt/Co(OH)₂ presented excellent catalytic performance in the chemoselective hydrogenation of halonitrobenzenes such as chloronitrobenzenes, bromonitrobenzene and iodonitrobenzene, and above 99.6%selectivity to haloanilines was achieved at complete conversion irrespective of the substrates used, even for iodonitrobenzene to which the dehalogenation is more easily to occur. Co(OH)₂ was confirmed to prohibit the dehalogenation effectively, and the Pt/Co(OH)₂ catalyst could be recycled for several times.