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Título

Functionalized carbon nanotubes as support of Iridium-NHC complexes for catalysis applications

AutorBlanco, Matías ; Álvarez Rodríguez, Patricia ; Blanco Rodríguez, Clara ; Jiménez, M. Victoria ; Fernández-Tornos, Javier ; Oro, Luis A. ; Menéndez López, Rosa María
Fecha de publicación2013
CitaciónCARBON 2013
ResumenA new strategy for the functionalization of multiwalled carbon nanotubes (MWCNT) for their use as support of iridium N-heterocyclic carbene (NHC) complexes has been developed. Oxidized MWCNT obtained by acid treatment were covalently modified through their OH groups by functionalization with the appropriate hydroxyl-ending imidazolium salt. Carbon nanotubes thermally reduced at 400 ºC (MWCNT-TR400) were also studied for comparative purposes. The quantification of imidazolium groups in the imidazolium-modified MWCNT samples were carried out by means of solid characterization techniques such as TGA or XPS. Moderated to good conversions were achieved. Both samples were used to generate immobilized iridium NHC complexes from the imidazolium salts. The supported complexes were active as heterogeneous catalysts for the reduction of cyclohexanone to cyclohexanol by transfer hydrogenation processes from 2-propanol/KOH. A comparative study with related homogeneous acetoxy-functionalized Ir-NHC complexes has shown that heterogeneous systems are more efficient than the homogeneous ones. Good catalyst recyclability without any loss of catalytic activity and excellent catalyst stability on air was observed.
DescripciónTrabajo presentado como póster a la Annual World Conference on Carbon celebrada en Rio de Janeiro (Brasil) del 14 al 19 de julio de 2013.
URIhttp://hdl.handle.net/10261/112111
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