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Rhodium and iridium nanoparticles entrapped in aluminum oxyhydroxide nanofibers: Catalysts for hydrogenations of arenes and ketones at room temperature with hydrogen balloon

Title
Rhodium and iridium nanoparticles entrapped in aluminum oxyhydroxide nanofibers: Catalysts for hydrogenations of arenes and ketones at room temperature with hydrogen balloon
Authors
Park, ISKwon, MSKang, KYLee, JSPark, J박재욱
Date Issued
Aug-2007
Publisher
WILEY-V C H VERLAG GMBH
Abstract
The recyclable metal nanoparticle catalysts, rhodium in aluminum oxyhydroxide [Rh/AlO(OH)] and iridium in aluminum oxyhydroxide [Ir/AlO(OH)], were simply prepared from readily available reagents. The catalysts showed high activities in the hydrogenation of various arenes and ketones under mild conditions. Selective hydrogenation was possible for bicyclic and tricyclic arenes in high yields. The catalysts were active at room temperature even with a hydrogen balloon. Also, the catalysts showed high turnover frequency (TOF) values under solventless conditions at 75 degrees C under 4 atm hydrogen pressure: ca. 1700 h(-1) in the hydrogenation of benzene. Furthermore, Rh/AlO(OH) can be reused for at least 10 times without activity loss. The catalysts were characterized by the transmission electron microscopy (TEM), powder X-ray diffraction (XRD), inductively coupled plasma (ICP), energy dispersive X-ray analysis (EDX), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption and hydrogen chemisorption experiments. The sizes of rhodium and iridium particles were estimated to be 3-4 nm and 2-3 nm, respectively. Aluminum oxyhydroxide nanofibers of these catalysts have surface areas of 500-600 m(2)g(-1).
Keywords
arenes; heterogeneous catalysis; hydrogenation; iridium; ketones; rhodium; IMIDAZOLIUM IONIC LIQUIDS; PALLADIUM HETEROGENEOUS CATALYST; STABILIZED RH(0) NANOCLUSTERS; BENZENE HYDROGENATION; BOEHMITE NANOFIBERS; METAL NANOPARTICLES; SUPERCRITICAL CO2; MILD CONDITIONS; BIPHASIC MEDIA; WATER
URI
http://oasis.postech.ac.kr/handle/2014.oak/23187
DOI
10.1002/ADSC.2006006
ISSN
1615-4150
Article Type
ARTICLE
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