Activity and Thermal Aging Stability of La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> (x = 0.0, 0.3, 0.5, 0.7) and Ir/La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> Catalysts for CO Oxidation with Excess O<sub>2</sub>
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 La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> perovskit...
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| Format: | Article |
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MDPI AG
2023-02-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/4/663 |
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| author | Catherine Drosou Ersi Nikolaraki Vasilios Nikolaou Evangelia Koilia Georgios Artemakis Antonios Stratakis Antigoni Evdou Nikolaos D. Charisiou Maria A. Goula Vasilios Zaspalis Ioannis V. Yentekakis |
| author_facet | Catherine Drosou Ersi Nikolaraki Vasilios Nikolaou Evangelia Koilia Georgios Artemakis Antonios Stratakis Antigoni Evdou Nikolaos D. Charisiou Maria A. Goula Vasilios Zaspalis Ioannis V. Yentekakis |
| author_sort | Catherine Drosou |
| collection | DOAJ |
| description | 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 La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> perovskites (LSMx), either unloaded or loaded with dispersed Ir nanoparticles (Ir/LSMx), was studied in the temperature range 100–450 °C under excess O<sub>2</sub> conditions (1% CO + 5% O<sub>2</sub>). The perovskites, of the type La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> (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, N<sub>2</sub> sorption–desorption by BET-BJH, H<sub>2</sub>-TPR and H<sub>2</sub>-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. |
| first_indexed | 2024-03-11T08:20:32Z |
| format | Article |
| id | doaj.art-fe23257978074f19832eaa10195aac6a |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-11T08:20:32Z |
| publishDate | 2023-02-01 |
| publisher | MDPI AG |
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| series | Nanomaterials |
| spelling | doaj.art-fe23257978074f19832eaa10195aac6a2023-11-16T22:27:17ZengMDPI AGNanomaterials2079-49912023-02-0113466310.3390/nano13040663Activity and Thermal Aging Stability of La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> (x = 0.0, 0.3, 0.5, 0.7) and Ir/La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> Catalysts for CO Oxidation with Excess O<sub>2</sub>Catherine Drosou0Ersi Nikolaraki1Vasilios Nikolaou2Evangelia Koilia3Georgios Artemakis4Antonios Stratakis5Antigoni Evdou6Nikolaos D. Charisiou7Maria A. Goula8Vasilios Zaspalis9Ioannis V. Yentekakis10Laboratory of Physical Chemistry & Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 73100 Chania, Crete, GreeceLaboratory of Physical Chemistry & Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 73100 Chania, Crete, GreeceLaboratory of Physical Chemistry & Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 73100 Chania, Crete, GreeceLaboratory of Physical Chemistry & Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 73100 Chania, Crete, GreeceLaboratory of Physical Chemistry & Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 73100 Chania, Crete, GreeceSchool of Mineral Resources Engineering, Technical University of Crete, 73100 Chania, Crete, GreeceDepartment of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceDepartment of Chemical Engineering, University of Western Macedonia, 50100 Koila, Kozani, GreeceDepartment of Chemical Engineering, University of Western Macedonia, 50100 Koila, Kozani, GreeceDepartment of Chemical Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, GreeceLaboratory of Physical Chemistry & Chemical Processes, School of Chemical and Environmental Engineering, Technical University of Crete, 73100 Chania, Crete, GreeceThe 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 La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> perovskites (LSMx), either unloaded or loaded with dispersed Ir nanoparticles (Ir/LSMx), was studied in the temperature range 100–450 °C under excess O<sub>2</sub> conditions (1% CO + 5% O<sub>2</sub>). The perovskites, of the type La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> (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, N<sub>2</sub> sorption–desorption by BET-BJH, H<sub>2</sub>-TPR and H<sub>2</sub>-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.https://www.mdpi.com/2079-4991/13/4/663CO oxidationexcess O<sub>2</sub> conditionsLSM perovskitesiridium nanoparticleshysteresis phenomenaisothermal steady-state multiplicity |
| spellingShingle | Catherine Drosou Ersi Nikolaraki Vasilios Nikolaou Evangelia Koilia Georgios Artemakis Antonios Stratakis Antigoni Evdou Nikolaos D. Charisiou Maria A. Goula Vasilios Zaspalis Ioannis V. Yentekakis Activity and Thermal Aging Stability of La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> (x = 0.0, 0.3, 0.5, 0.7) and Ir/La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> Catalysts for CO Oxidation with Excess O<sub>2</sub> Nanomaterials CO oxidation excess O<sub>2</sub> conditions LSM perovskites iridium nanoparticles hysteresis phenomena isothermal steady-state multiplicity |
| title | Activity and Thermal Aging Stability of La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> (x = 0.0, 0.3, 0.5, 0.7) and Ir/La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> Catalysts for CO Oxidation with Excess O<sub>2</sub> |
| title_full | Activity and Thermal Aging Stability of La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> (x = 0.0, 0.3, 0.5, 0.7) and Ir/La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> Catalysts for CO Oxidation with Excess O<sub>2</sub> |
| title_fullStr | Activity and Thermal Aging Stability of La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> (x = 0.0, 0.3, 0.5, 0.7) and Ir/La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> Catalysts for CO Oxidation with Excess O<sub>2</sub> |
| title_full_unstemmed | Activity and Thermal Aging Stability of La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> (x = 0.0, 0.3, 0.5, 0.7) and Ir/La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> Catalysts for CO Oxidation with Excess O<sub>2</sub> |
| title_short | Activity and Thermal Aging Stability of La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> (x = 0.0, 0.3, 0.5, 0.7) and Ir/La<sub>1−x</sub>Sr<sub>x</sub>MnO<sub>3</sub> Catalysts for CO Oxidation with Excess O<sub>2</sub> |
| title_sort | activity and thermal aging stability of la sub 1 x sub sr sub x sub mno sub 3 sub x 0 0 0 3 0 5 0 7 and ir la sub 1 x sub sr sub x sub mno sub 3 sub catalysts for co oxidation with excess o sub 2 sub |
| topic | CO oxidation excess O<sub>2</sub> conditions LSM perovskites iridium nanoparticles hysteresis phenomena isothermal steady-state multiplicity |
| url | https://www.mdpi.com/2079-4991/13/4/663 |
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