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Technical University of Crete
Technical University of Crete
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| URI | http://purl.tuc.gr/dl/dias/BE49C906-49B8-43A6-B0E8-0E6DCF8EC901 | - |
| Identifier | https://doi.org/10.3390/nano13040663 | - |
| Identifier | https://www.mdpi.com/2079-4991/13/4/663 | - |
| Language | en | - |
| Extent | 20 pages | en |
| Title | Activity and thermal aging stability of La1−xSrxMnO3 (x = 0.0, 0.3, 0.5, 0.7) and Ir/La1−xSrxMnO3 catalysts for CO oxidation with excess O2 | en |
| Creator | Drosou Aikaterini | en |
| Creator | Δροσου Αικατερινη | el |
| Creator | Nikolaraki Ersi | en |
| Creator | Νικολαρακη Ερση | el |
| Creator | Nikolaou Vasileios | en |
| Creator | Νικολαου Βασιλειος | el |
| Creator | Koilia Evangelia | en |
| Creator | Κοιλια Ευαγγελια | el |
| Creator | Artemakis Georgios | en |
| Creator | Αρτεμακης Γεωργιος | el |
| Creator | Stratakis Antonios | en |
| Creator | Στρατακης Αντωνιος | el |
| Creator | Evdou Antigoni | en |
| Creator | Charisiou Nikolaos D. | en |
| Creator | Goula Maria A. | en |
| Creator | Zaspalis Vasilios | en |
| Creator | Gentekakis Ioannis | en |
| Creator | Γεντεκακης Ιωαννης | el |
| Publisher | MDPI | en |
| Description | The authors gratefully acknowledge that this research has been cofinanced by the European Union and Greek national funds under the call “Greece–China Call for Proposals for Joint RT&D Projects”. Project title: Development of new Catalysts for Efficient De-NOX Abatement of Automobile Exhaust Purification (Project code: T7DKI-00356). | en |
| Content Summary | The catalytic oxidation of CO is probably the most investigated reaction in the literature, for decades, because of its extended environmental and fundamental importance. In this paper, the oxidation of CO on La1−xSrxMnO3 perovskites (LSMx), either unloaded or loaded with dispersed Ir nanoparticles (Ir/LSMx), was studied in the temperature range 100–450 °C under excess O2 conditions (1% CO + 5% O2). The perovskites, of the type La1−xSrxMnO3 (x = 0.0, 0.3, 0.5 and 0.7), were prepared by the coprecipitation method. The physicochemical and structural properties of both the LSMx and the homologous Ir/LSMx catalysts were evaluated by various techniques (XRD, N2 sorption–desorption by BET-BJH, H2-TPR and H2-Chem), in order to better understand the structure–activity–stability correlations. The effect of preoxidation/prereduction/aging of the catalysts on their activity and stability was also investigated. Results revealed that both LSMx and Ir/LSMx are effective for CO oxidation, with the latter being superior to the former. In both series of materials, increasing the substitution of La by Sr in the composition of the perovskite resulted to a gradual suppression of their CO oxidation activity when these were prereduced; the opposite was true for preoxidized samples. Inverse hysteresis phenomena in activity were observed during heating/cooling cycles on the prereduced Ir/LSMx catalysts with the loop amplitude narrowing with increasing Sr-content in LSMx. Oxidative thermal sintering experiments at high temperatures revealed excellent antisintering behavior of Ir nanoparticles supported on LSMx, resulting from perovskite’s favorable antisintering properties of high oxygen storage capacity and surface oxygen vacancies. | en |
| Type of Item | Peer-Reviewed Journal Publication | en |
| Type of Item | Δημοσίευση σε Περιοδικό με Κριτές | el |
| License | http://creativecommons.org/licenses/by/4.0/ | en |
| Date of Item | 2025-06-05 | - |
| Date of Publication | 2023 | - |
| Subject | CO oxidation | en |
| Subject | Excess O2 conditions | en |
| Subject | LSM perovskites | en |
| Subject | Iridium nanoparticles | en |
| Subject | Hysteresis phenomena | en |
| Subject | Isothermal steady-state multiplicity | en |
| Bibliographic Citation | C. Drosou, E. Nikolaraki, V. Nikolaou, E. Koilia, G. Artemakis, A. Stratakis, A. Evdou, N. D. Charisiou, M. A. Goula, V. Zaspalis and I. V. Yentekakis, “Activity and thermal aging stability of La1−xSrxMnO3 (x = 0.0, 0.3, 0.5, 0.7) and Ir/La1−xSrxMnO3 catalysts for CO oxidation with excess O2,” Nanomaterials, vol. 13, no. 4, Feb. 2023, doi: 10.3390/nano13040663. | en |
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