127871 20231127095528.0 doi 10.1016/j.carbon.2015.09.018 sideral 93136 ART-2016-93136 eng Blanco, M. Effect of structural differences of carbon nanotubes and graphene based iridium-NHC materials on the hydrogen transfer catalytic activity 2016 Access copy available to the general public Unrestricted 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. info:eu-repo/grantAgreement/ES/MEC/AP2010-0025 info:eu-repo/grantAgreement/ES/MINECO/AP2010-0025 info:eu-repo/grantAgreement/ES/MINECO/CSD2009-00050 info:eu-repo/grantAgreement/ES/MINECO/CTQ2013-42532-P info:eu-repo/grantAgreement/ES/MINECO-FEDER/CTQ2013-42532-P info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 6.337 2016 MATERIALS SCIENCE, MULTIDISCIPLINARY 32 / 273 = 0.117 2016 Q1 T1 CHEMISTRY, PHYSICAL 23 / 144 = 0.16 2016 Q1 T1 2.091 2016 Chemistry (miscellaneous) 2016 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Álvarez, P. Blanco, C. Jiménez, M. V. Universidad de Zaragoza (orcid)0000-0002-0545-9107 Fernández-Tornos, J. Pérez-Torrente, J. J. Universidad de Zaragoza (orcid)0000-0002-3327-0918 Blasco, J. Universidad de Zaragoza (orcid)0000-0002-9706-3272 Subías, G. Universidad de Zaragoza (orcid)0000-0002-9029-1977 Cuartero, V. Oro, L. A. Universidad de Zaragoza (orcid)0000-0001-7154-7239 Menéndez, R. 2010 760 Universidad de Zaragoza Dpto. Química Inorgánica Área Química Inorgánica 2003 395 Universidad de Zaragoza Dpto. Física Materia Condensa. Área Física Materia Condensada 96 (2016), 66-74 Carbon Carbon 0008-6223 1767560 http://zaguan.unizar.es/record/127871/files/texto_completo.pdf Postprint 1837472 http://zaguan.unizar.es/record/127871/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:127871 articulos driver 2023-11-27-09:46:00 ARTICLE