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Pàgina inicial > Articles > Articles publicats > Magnetically-actuated mesoporous nanowires for enhanced heterogeneous catalysis |
Data: | 2017 |
Resum: | We study the optimization of the catalytic properties of entirely magnetic Co-Pt compact and mesoporous nanowires of different diameters (25-200 nm) by using magnetic actuation. The nanowires are a single-entity, robust, magnetic-catalyst with a huge catalytically-active surface area. We show that apart from conventional parameters, like the size and morphology of the nanowires, other factors can be optimized to enhance their catalytic activity. In particular, given the magnetic character of the nanowires, rotating magnetic fields are a very powerful approach to boost the performance of the catalyst. In particular, the magnetic field induces them to act as nano-stirrers, improving the local flow of material towards the active sites of the catalyst. We demonstrate the versatility of the procedure by optimizing (i) the degradation of different types of pollutants (4-nitrophenol and methylene blue) and (ii) hydrogen production. For example, by using as little as 0. 1 mg mL⁻¹ of 25 nm wide Co-Pt mesoporous nanowires (with ∼3 nm pore size) as catalysts, kinetic normalized constants knor as high as 20,667 and 21,750 s⁻¹ g⁻¹ for 4-nitrophenol and methylene blue reduction, respectively, are obtained. In addition, activity values for hydrogen production from borohydride are as high as 25. 0 L H₂ g⁻¹ min⁻¹, even at room temperature. These values outperform any current state-of-the-art proposed catalysis strategies for water remediation reactions by at least 10-times and are superior to most advanced approaches to generate hydrogen from borohydride. The recyclability of the nanowires together with the simplicity of the synthetic method makes this approach (using not only Co-Pt, but also other mesoporous magnetic catalysts) very appealing for very diverse types of catalytic applications. |
Ajuts: | European Commission 648454 Ministerio de Economía y Competitividad CTQ-2016-80058-R Ministerio de Economía y Competitividad MAT2014-57960-C3-1-R Ministerio de Economía y Competitividad TEC2014-51940-C2-2-R Ministerio de Economía y Competitividad CTQ-2014-52974-REDC Ministerio de Economía y Competitividad SEV-2013-0319 Ministerio de Economía y Competitividad SEV-2013-0295 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1015 |
Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió acceptada per publicar |
Matèria: | Mesoporous magnetic nanowires ; Magnetically-actuated catalysis ; Water remediation ; Hydrogen production ; Catalyst recyclability |
Publicat a: | Applied catalysis. B, Environmental, Vol. 217, (Nov. 2017) , p. 81-91, ISSN 0926-3373 |
Postprint 29 p, 1.3 MB |