期刊
ACS CATALYSIS
卷 3, 期 6, 页码 1307-1317出版社
AMER CHEMICAL SOC
DOI: 10.1021/cs4000798
关键词
carbon nanotubes; functionalization; iridium; transfer hydrogenation; confinement effect; heterogeneous catalysis
资金
- MICINN [CSD2009-00050, CTQ 2010-15221]
- Diputacion General de Aragon [E07]
- MECD
Oxidized multiwall carbon nanotubes (CNT) were covalently modified with appropriate hydroxyl-ending imidazolium salts using their carboxylic acid groups. Characterization of the imidazolium-modified samples through typical solid characterization techniques, such as TGA or XPS, allows for the determination of 16 wt % in CNT-1 and 31 wt % in CNT-2 as the amount of the imidazolic fragments in the carbon nanotubes. The imidazolium-functionalized materials were used to prepare nanohybrid materials containing iridium N-heterocyclic carbene (NHC)-type organometallic complexes with efficiencies as high as 95%. The nanotube-supported iridium-NHC materials were active in the heterogeneous iridium-catalyzed hydrogen-transfer reduction of cyclohexanone to cyclohexanol with 2-propanol/KOH as hydrogen source. The iridium hybrid materials are more efficient than related homogeneous catalysts based on acetoxy-functionalized Ir-NHC complexes with initial TOFs up to 5550 h(-1). A good recyclability of the catalysts, without any loss of activity, and stability in air was observed.
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