Publication Type Journal Article
Title Reduction of NO with new vanadium-carbon xerogel composites. Effect of the oxidation state of vanadium species
Authors Esther Bailón-García Abdelhakim Elmouwahidi Filipa Ribeiro Carlos Henriques Agustin F. Perez-Cadenas Francisco Carrasco-Marin Francisco J. Maldonado-Hodar
Groups FM CE CATHPRO
Journal CARBON
Year 2020
Month January
Volume 156
Number
Pages 194-204
Abstract Vanadium-carbon composites were successfully prepared by sol-gel methods, and their behaviour as NOx-reduction catalysts was tested. Two different synthesis approaches were employed: the distribution of VOx (i) along the carbon matrix and (ii) on the carbon spheres surface. This allows to modify the carbon-VOx interaction and thus, evaluate the role of vanadium oxidation state in the NOx abatement. The distribution of VOx along the carbon matrix favours the dispersion and reducibility of VOx nanoparticles and improves the carbon-VOx contact stabilizing vanadium low oxidation states (V2+), however part of the VOx particles were embedded on the carbon matrix becoming inactive. The distribution of those species on the carbon spheres surface improves the accessibility to the VOx active sites but at the expense of the decrease of the carbon-VOx interaction and VOx dispersion and reducibility. The oxidation state of the active phase is related with the global synthesis procedure and that reducibility depends on the interactions between phases. Catalytic results evidence that the NO reduction is strongly influenced by the oxidation state of vanadium. Commercial V2O5 and carbon-V2O5 physical mixture are poorly reactive whereas a stronger activity improvement activity was observed for C-VOx composites reaching conversion higher than 91\% at 450 degrees C. (C) 2019 Elsevier Ltd. All rights reserved.
DOI http://dx.doi.org/10.1016/j.carbon.2019.09.047
ISBN
Publisher
Book Title
ISSN 0008-6223
EISSN 1873-3891
Conference Name
Bibtex ID ISI:000509332200018
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