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Título: | Effect of structural differences of carbon nanotubes and graphene based iridium-NHC materials on the hydrogen transfer catalytic activity |
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; Blasco, Javier CSIC ORCID; Subías, G. CSIC ORCID; Cuartero, Vera CSIC ORCID; Oro, Luis A. CSIC ORCID; Menéndez López, Rosa María CSIC | Palabras clave: | Graphene Carbon nanotubes Iridium-NHC complexes Heterogenous catalysis Hydrogen transfer |
Fecha de publicación: | 2016 | Editor: | Elsevier | Citación: | Carbon 96: 66-74 (2016) | Resumen: | A proper design of heterogeneous molecular catalysts supported on carbon materials requires a systematic study of >metal-carbon support interactions> and their influence on catalytic activity. In this study, hybrid materials containing covalently anchored iridium N-heterocyclic carbene (NHC) organometallic complexes have been successfully prepared from oxidized and partially reduced carbon nanotubes (CNTs). The preparation method for these supported materials relies on the selective functionalization of the superficial hydroxylic groups using the imidazolium salt, 1-(3-hydroxypropyl)-3-methyl-1H-imidazol-3-ium chloride. The hydrogen transfer catalysis activity of these nanotube-based hybrid catalysts was tested by the reduction of cyclohexanone to cyclohexanol with 2-propanol, and the results of the tests were compared with those obtained using similar hybrid graphene-based catalysts. While EXAFS analysis revealed a common first coordination shell of the iridium atom for all the hybrid materials examined, independently of whether they were either supported on carbon nanotubes or graphene materials, catalytic activity in all the reduced materials was significantly superior. Moreover, catalytic systems based on reduced CNTs exhibited a better performance than those based on reduced graphene materials. Both these facts suggest there is a positive correlation between hydrogen transfer catalytic activity, reconstruction of the aromatic carbon structure and the smaller amount of oxygen functional groups. | Versión del editor: | http://dx.doi.org/10.1016/j.carbon.2015.09.018 | URI: | http://hdl.handle.net/10261/133806 | DOI: | 10.1016/j.carbon.2015.09.018 | Identificadores: | doi: 10.1016/j.carbon.2015.09.018 issn: 0008-6223 |
Aparece en las colecciones: | (INCAR) Artículos (ISQCH) Artículos (ICMA) Artículos |
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transfer catalytic activity.pdf | 1,83 MB | Adobe PDF | Visualizar/Abrir |
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