Evaluation of hectorites, synthesized in different conditions, as soot combustion catalysts after impregnation with copper

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Title: Evaluation of hectorites, synthesized in different conditions, as soot combustion catalysts after impregnation with copper
Authors: Sánchez Motta, Tatiana | Gebretsadik, Fiseha Bogale | Salagre Carnero, Pilar | Cesteros Fernández, Yolanda | Guillén Hurtado, Noelia | Garcia-Garcia, Avelina | Bueno López, Agustín
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: Copper catalysts | Delaminated hectorite | Diesel soot | Soot combustion mechanism
Knowledge Area: Química Inorgánica
Issue Date: Jun-2013
Publisher: Elsevier
Citation: Applied Clay Science. 2013, 77-78: 40-45. doi:10.1016/j.clay.2013.03.012
Abstract: Two microporous hectorites were prepared by conventional and microwave heating, and a delaminated mesoporous hectorite by an ultrasound-assisted synthesis. These three hectorites were impregnated with copper. The characterization techniques used were XRD, N2 adsorption, TEM and H2 reduction after selective surface copper oxidation by N2O (to determine copper dispersion). The catalytic activity for soot combustion of the copper-free and the copper-containing hectorites was tested under a gas mixture of 500 ppm NOx/5% O2/N2 (and 5% O2/N2 in some cases), evaluating their stability through three consecutive soot combustion experiments. The delaminated hectorite showed the highest surface area (353 m2/g) allowing the highest dispersion of copper. This copper-containing catalyst was the most active for soot combustion among those prepared and tested in this study. We have also concluded that the Cu/hectorite-catalyzed soot combustion mechanism is based on the activation of the O2 molecule and not on the NO2-assisted soot combustion.
Sponsor: The authors gratefully acknowledge the financial support of Generalitat Valenciana (Prometeo/2009/047 project), the Spanish Ministry of Economy and Competitiveness (project CTQ2012-30703), the Spanish Ministry of Science and Innovation (project CTQ2011-24610), and the UE (FEDER Funding). N.G.H. wishes to thank Generalitat Valenciana for her Ph.D. grant within VAL i + d Program.
URI: http://hdl.handle.net/10045/40169
ISSN: 0169-1317 (Print) | 1872-9053 (Online)
DOI: 10.1016/j.clay.2013.03.012
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.clay.2013.03.012
Appears in Collections:INV - MCMA - Artículos de Revistas

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