Co-Cu Nanoparticles : Synthesis by Galvanic Replacement and Phase Rearrangement during Catalytic Activation
Nafria, Raquel (Institut de Recerca en Energia de Catalunya)
Genç, Aziz (Institut Català de Nanociència i Nanotecnologia)
Ibáñez, Maria (Institut de Recerca en Energia de Catalunya)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Ramírez de la Piscina, Pilar (Universitat de Barcelona. Departament de Química Inorgànica i Orgànica)
Homs, N. (Universitat de Barcelona. Institut de Nanociència i Nanotecnologia)
Cabot, Andreu (Institut de Recerca en Energia de Catalunya)

Date:	2016
Abstract:	The control of the phase distribution in multicomponent nanomaterials is critical to optimize their catalytic performance. In this direction, while impressive advances have been achieved in the past decade in the synthesis of multicomponent nanoparticles and nanocomposites, element rearrangement during catalyst activation has been frequently overseen. Here, we present a facile galvanic replacement-based procedure to synthesize Co@Cu nanoparticles with narrow size and composition distributions. We further characterize their phase arrangement before and after catalytic activation. When oxidized at 350 °C in air to remove organics, Co@Cu core-shell nanostructures oxidize to polycrystalline CuO-CoO nanoparticles with randomly distributed CuO and CoO crystallites. During a posterior reduction treatment in H atmosphere, Cu precipitates in a metallic core and Co migrates to the nanoparticle surface to form Cu@Co core-shell nanostructures. The catalytic behavior of such Cu@Co nanoparticles supported on mesoporous silica was further analyzed toward CO hydrogenation in real working conditions.
Grants:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1638 Agència de Gestió d'Ajuts Universitaris i de Recerca 2013/BP-A00344 Ministerio de Ciencia e Innovación MAT2014-52416-P Ministerio de Ciencia e Innovación ENE2013-46624-C4-3-R Ministerio de Ciencia e Innovación CSD2009-00050 Ministerio de Economía y Competitividad SEV-2013-0295
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Catalytic activation ; Catalytic performance ; Composition distributions ; Core shell nano structures ; Galvanic replacements ; Nanoparticle surface ; Randomly distributed ; Reduction treatment
Published in:	Langmuir, Vol. 32, Núm. 9 (March 2016) , p. 2267-2276, ISSN 1520-5827

DOI: 10.1021/acs.langmuir.5b04622

Post-print 35 p, 2.4 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles