Microwave-assisted catalysis by iron oxide nanoparticles on MCM-41: Effect of the support morphology

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Title: Microwave-assisted catalysis by iron oxide nanoparticles on MCM-41: Effect of the support morphology
Authors: Carrillo Gómez, Adela Isabel | Serrano, Elena | Luque, Rafael | Garcia-Martinez, Javier
Research Group/s: Laboratorio de Nanotecnología Molecular (NANOMOL)
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica
Keywords: Microwaves | Heterogeneous catalysis | Iron oxide nanoparticles | MCM-41 type materials
Knowledge Area: Química Inorgánica
Issue Date: 26-Feb-2013
Publisher: Elsevier
Citation: Applied Catalysis A: General. 2013, 453: 383-390. doi:10.1016/j.apcata.2012.12.041
Abstract: Catalytically active heterogeneous catalysts have been prepared via microwave deposition of iron oxide nanoparticles (0.5–1.2 wt%) on MCM-41 type silica materials with different morphologies (particles, helical and spheres). This methodology leads to iron oxide nanoparticles composed by a mixture of FeO and Fe2O3 species, being the Fe(II)/Fe(III) peak ratio near to 1.11 by XPS. DRUV spectroscopy indicates the presence of tetrahedral coordinated Fe3+ in the silica framework of the three catalysts as well as some extraframework iron species in the catalysts with particle and sphere-like morphologies. The loading of the nanoparticles does neither affect the mesopore arrangement nor the textural properties of the silica supports, as indicated by SAXS and nitrogen adsorption/desorption isotherms. A detailed investigation of the morphology of the supports in various microwave-assisted catalyzed processes shows that helical mesostructures provide optimum catalytic activities and improved reusabilities in the microwave-assisted redox (selective oxidation of benzyl alcohol) catalyzed process probably due to a combination of lower particle size and higher acidity in comparison with the supports with particle and sphere morphology.
Sponsor: J.G.M. and R.L. gratefully acknowledge funding under project CTQ2011-28954-C02-01(02) (MICINN) from the Spanish MICINN. R.L. is also grateful for financial support via the concession of a RyC contract (RYC 2009 04199) and funding under the project P10-FQM-6711 (Consejeria de Ciencia e Innovacion, Junta de Andalucia). E.S. is grateful for financial support under the JdC program (ref. JCI 2008–2165) and from GV (ref. BEST2011/223).
URI: http://hdl.handle.net/10045/39433
ISSN: 0926-860X (Print) | 1873-3875 (Online)
DOI: 10.1016/j.apcata.2012.12.041
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.apcata.2012.12.041
Appears in Collections:INV - NANOMOL - Artículos de Revistas

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