Capillary microreactors based on hierarchical SiO2 monoliths incorporating noble metal nanoparticles for the Preferential Oxidation of CO

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Title: Capillary microreactors based on hierarchical SiO2 monoliths incorporating noble metal nanoparticles for the Preferential Oxidation of CO
Authors: Miguel García, Izaskun | Navlani-García, Miriam | García Aguilar, Jaime | Berenguer-Murcia, Ángel | Lozano Castelló, Dolores | Cazorla-Amorós, Diego
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Noble metal nanoparticles | Mesoporous SiO2 | Capillary microreactors | Hierarchical monoliths | Preferential Oxidation of CO (PrOx CO)
Knowledge Area: Química Inorgánica
Issue Date: 1-Sep-2015
Publisher: Elsevier
Citation: Chemical Engineering Journal. 2015, 275: 71-78. doi:10.1016/j.cej.2015.04.020
Abstract: Novel hierarchical SiO2 monolithic microreactors loaded with either Pd or Pt nanoparticles have been prepared in fused silica capillaries and tested in the Preferential Oxidation of CO (PrOx) reaction. Pd and Pt nanoparticles were prepared by the reduction by solvent method and the support used was a mesoporous SiO2 monolith prepared by a well-established sol–gel methodology. Comparison of the activity with an equivalent powder catalyst indicated that the microreactors show an enhanced catalytic behavior (both in terms of CO conversion and selectivity) due to the superior mass and heat transfer processes that take place inside the microchannel. TOF values at low CO conversions have been found to be ∼2.5 times higher in the microreactors than in the powder catalyst and the residence time seems to have a noticeable influence over the selectivity of the catalysts designed for this reaction. The Pd and Pt flexible microreactors developed in this work have proven to be effective for the CO oxidation reaction both in the presence and absence of H2, standing out as a very interesting and suitable option for the development of CO purification systems of small dimensions for portable and on-board applications.
Sponsor: This research was supported financially by MINECO, Generalitat Valenciana and FEDER (Projects CTQ2012-31762 and PROMETEOII/2014/010). J.G.A. and A.B.M. thank the Spanish Ministry of Economy and Competitiveness (MINECO) for their fellowships (BES-2013-063678 and RyC 2009-03913, respectively). I.M.G. and M.N.G. also thank the University of Alicante for their PhD fellowships.
ISSN: 1385-8947 (Print) | 1873-3212 (Online)
DOI: 10.1016/j.cej.2015.04.020
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2015 Elsevier B.V.
Peer Review: si
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Appears in Collections:INV - MCMA - Artículos de Revistas

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