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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
Author(s) -
Park In Soo,
Kwon Min Serk,
Kang Kyung Yeon,
Lee Jae Sung,
Park Jaiwook
Publication year - 2007
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.200600651
Subject(s) - rhodium , catalysis , iridium , chemistry , x ray photoelectron spectroscopy , nanoparticle , inorganic chemistry , hydrogen , chemisorption , nuclear chemistry , chemical engineering , organic chemistry , materials science , nanotechnology , engineering
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 °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 .