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Highly active Co3O4-based catalysts for total oxidation of light C1-C3 alkanes prepared by a simple soft chemistry method: effect of the heat-treatment temperature and mixture of alkanes

Sanchis, Rut, García, Adrián, Ivars-Barceló, Francisco, Taylor, Stuart H. ORCID: https://orcid.org/0000-0002-1933-4874, García, Tomás, Dejoz, Ana, Vázquez, María Isabel and Solsona, Benjamín 2021. Highly active Co3O4-based catalysts for total oxidation of light C1-C3 alkanes prepared by a simple soft chemistry method: effect of the heat-treatment temperature and mixture of alkanes. Materials 14 (23) , 7120. 10.3390/ma14237120

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Abstract

In the present work, a simple soft chemistry method was employed to prepare cobalt mixed oxide (Co3O4) materials, which have shown remarkably high activity in the heterogeneously catalyzed total oxidation of low reactive VOCs such as the light alkanes propane, ethane, and methane. The optimal heat-treatment temperature of the catalysts was shown to depend on the reactivity of the alkane studied. The catalytic activity of the Co3O4 catalysts was found to be as high as that of the most effective catalysts based on noble metals. The physicochemical properties, from either the bulk (using XRD, TPR, TPD-O2, and TEM) or the surface (using XPS), of the catalysts were investigated to correlate the properties with the catalytic performance in the total oxidation of VOCs. The presence of S1 low-coordinated oxygen species at the near surface of the Co3O4-based catalysts appeared to be linked with the higher reducibility of the catalysts and, consequently, with the higher catalytic activity, not only per mass of catalyst but also per surface area (enhanced areal rate). The co-presence of propane and methane in the feed at low reaction temperatures did not negatively affect the propane reactivity. However, the co-presence of propane and methane in the feed at higher reaction temperatures negatively affected the methane reactivity.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Additional Information: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
Publisher: MDPI
ISSN: 1996-1944
Date of First Compliant Deposit: 16 December 2021
Date of Acceptance: 15 November 2021
Last Modified: 10 Nov 2022 10:15
URI: https://orca.cardiff.ac.uk/id/eprint/146187

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