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The promoter effect of Nb species on the catalytic performance of Ir-based catalysts for VOCs total oxidation

Chávez-Sifontes, Marvin, García, Adrián, Sanchis, Rut, Furgeaud, Clarisse, Mayoral, Alvaro, Arenal, Raul, Morgan, David J. ORCID: https://orcid.org/0000-0002-6571-5731, Taylor, Stuart H. ORCID: https://orcid.org/0000-0002-1933-4874, López, Jose Manuel, García, Tomás and Solsona, Benjamín 2022. The promoter effect of Nb species on the catalytic performance of Ir-based catalysts for VOCs total oxidation. Journal of Environmental Chemical Engineering 10 (5) , 108261. 10.1016/j.jece.2022.108261

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Abstract

Ir/TiO2 catalysts promoted by niobium have been synthesized, characterized by different complementary techniques, and tested for the total oxidation of a set of alkanes and their mixtures. The addition of appropriate amounts of niobium to Ir/TiO2 catalysts resulted in a remarkable increase in the catalytic activity compared to the Nb-free Ir/TiO2 catalysts. The promotion caused by the presence of niobium has been related to the massive presence of isolated IrOx surface species which, interestingly, present remarkable reducibility and, consequently, excellent catalytic activity. Conversely, the IrOx species formed in the catalyst in the absence of niobium also include IrO2 clusters with lower intrinsic reactivity. Similarly, Nb-loadings exceeding the theoretical monolayer tends to the formation of bulk Nb2O5 species on the titania surface that provokes the formation of IrO2 nanoclusters. A positive influence on the reactivity of non-stoichiometric surface Ti3+ species that generates oxygen vacancies is also observed.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Additional Information: Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Publisher: Elsevier
ISSN: 2213-3437
Funders: Regional Government of Aragon (DGA)
Date of First Compliant Deposit: 5 August 2022
Date of Acceptance: 10 July 2022
Last Modified: 30 Nov 2022 08:29
URI: https://orca.cardiff.ac.uk/id/eprint/151730

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