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Título: | Enhanced hydrogen-transfer catalytic activity of iridium N-heterocyclic carbenes by covalent attachment on carbon nanotubes |
Autor: | Blanco, Matías CSIC ORCID; Álvarez Rodríguez, Patricia CSIC ORCID ; Blanco Rodríguez, Clara CSIC ORCID ; Jiménez, M. Victoria CSIC ORCID ; Fernández-Tornos, Javier CSIC; Pérez-Torrente, Jesús J. CSIC ORCID; Oro, Luis A. CSIC ORCID; Menéndez López, Rosa María CSIC | Fecha de publicación: | 2013 | Editor: | American Chemical Society | Citación: | ACS Catalysis 3(6): 1307-1317 (2013) | Resumen: | 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. © 2013 American Chemical Society. | Versión del editor: | http://dx.doi.org/10.1021/cs4000798 | URI: | http://hdl.handle.net/10261/111183 | DOI: | 10.1021/cs4000798 | Identificadores: | doi: 10.1021/cs4000798 e-issn: 2155-5435 |
Aparece en las colecciones: | (ISQCH) Artículos (INCAR) Artículos |
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Enhanced TH catalytic activity of Iridium.pdf | 579,67 kB | Adobe PDF | Visualizar/Abrir |
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