TY - JOUR
T1 - Microwave irradiation for the facile synthesis of transition-metal nanoparticles (NPs) in ionic liquids (ILs) from metal-carbonyl precursors and Ru-, Rh-, and Ir-NP/IL dispersions as biphasic liquid-liquid hydrogenation nanocatalysts for cyclohexene
AU - Vollmer, Christian
AU - Redel, Engelbert
AU - Abu-Shandi, Khalid
AU - Thomann, Ralf
AU - Manyar, Haresh
AU - Hardacre, Christopher
AU - Janiak, Christoph
PY - 2010/3/22
Y1 - 2010/3/22
N2 - Stable chromium, molybdenum, tungsten, manganese, rhenium, ruthenium, osmium, cobalt, rhodium, and iridium metal nanoparticles (MNPs) have been reproducibly obtained by facile, rapid (3 min), and energysaving 1OW microwave irradiation (MWI) under an argon atmosphere from their metal-carbonyl precursors [Mx(CO)y] in the ionic liquid (IL) 1-butyl-3- methylimidazolium tetrafluoroborate ([BMIm][BF4]). This MWI synthesis is compared to UV-photolytic (1000 W, 15 min) or conventional thermal decomposition (180-250°C, 6-12 h) of [Mx(CO)y] in ILs. The MWI-obtained nanoparticles have a very small (-1 h-1 and 884 (mol product) (mol Rh)-1 h-1 and give almost quantitative conversion within 2 h at 10 bar H2 and 90°C. Catalyst poisoning experiments with CS2 (0.05 equiv per Ru) suggest a heterogeneous surface catalysis of RuNPs.
AB - Stable chromium, molybdenum, tungsten, manganese, rhenium, ruthenium, osmium, cobalt, rhodium, and iridium metal nanoparticles (MNPs) have been reproducibly obtained by facile, rapid (3 min), and energysaving 1OW microwave irradiation (MWI) under an argon atmosphere from their metal-carbonyl precursors [Mx(CO)y] in the ionic liquid (IL) 1-butyl-3- methylimidazolium tetrafluoroborate ([BMIm][BF4]). This MWI synthesis is compared to UV-photolytic (1000 W, 15 min) or conventional thermal decomposition (180-250°C, 6-12 h) of [Mx(CO)y] in ILs. The MWI-obtained nanoparticles have a very small (-1 h-1 and 884 (mol product) (mol Rh)-1 h-1 and give almost quantitative conversion within 2 h at 10 bar H2 and 90°C. Catalyst poisoning experiments with CS2 (0.05 equiv per Ru) suggest a heterogeneous surface catalysis of RuNPs.
KW - Heterogeneous catalysis
KW - Hydrogenation
KW - Ionic liquids
KW - Nanoparticles
KW - Transition metals
UR - http://www.scopus.com/inward/record.url?scp=77949697947&partnerID=8YFLogxK
U2 - 10.1002/chem.200903214
DO - 10.1002/chem.200903214
M3 - Article
AN - SCOPUS:77949697947
SN - 0947-6539
VL - 16
SP - 3849
EP - 3858
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
IS - 12
ER -