Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO
A large signal of gas-phase CO overlapping with those of adsorbates is often present when investigating catalysts by operando diffuse reflectance FT-IR spectroscopy. Physically removing CO(g) from the IR cell may lead to a fast decay of adsorbate signals. Our work shows that carbonyls adsorbed on me...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-05-01
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| Series: | Catalysts |
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| Online Access: | https://www.mdpi.com/2073-4344/12/5/532 |
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| author | Frédéric C. Meunier Taha Elgayyar Kassiogé Dembélé Helena Kaper |
| author_facet | Frédéric C. Meunier Taha Elgayyar Kassiogé Dembélé Helena Kaper |
| author_sort | Frédéric C. Meunier |
| collection | DOAJ |
| description | A large signal of gas-phase CO overlapping with those of adsorbates is often present when investigating catalysts by operando diffuse reflectance FT-IR spectroscopy. Physically removing CO(g) from the IR cell may lead to a fast decay of adsorbate signals. Our work shows that carbonyls adsorbed on metallic Pt sites fully vanished in less than 10 min at 30 °C upon removing CO(g) when redox supports were used. In contrast, a broad band assigned to CO adsorbed on oxidized Pt sites was stable. It was concluded that physically removing CO(g) at room temperature during IR analyses will most likely lead to changes in the distribution of CO(ads) and a misrepresentation of the Pt site speciation, misguiding the development of efficient low-temperature CO oxidation catalysts. A tentative representation of the nature of the Pt phases present depending on the feed composition is also proposed. |
| first_indexed | 2024-03-10T03:10:21Z |
| format | Article |
| id | doaj.art-1f4292613c2941278ec66f53ed33d747 |
| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-10T03:10:21Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Catalysts |
| spelling | doaj.art-1f4292613c2941278ec66f53ed33d7472023-11-23T10:26:16ZengMDPI AGCatalysts2073-43442022-05-0112553210.3390/catal12050532Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of COFrédéric C. Meunier0Taha Elgayyar1Kassiogé Dembélé2Helena Kaper3Univ Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, 2 Av. Albert Einstein, 69626 Villeurbanne, FranceUniv Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON, 2 Av. Albert Einstein, 69626 Villeurbanne, FranceDepartment of Inorganic Chemistry, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, GermanyLaboratoire de Synthèse et Fonctionnalisation des Céramiques, UMR 3080, CNRS/Saint-Gobain CREE, Saint-Gobain Research Provence, 550 Ave Alphonse Jauffret, 84300 Cavaillon, FranceA large signal of gas-phase CO overlapping with those of adsorbates is often present when investigating catalysts by operando diffuse reflectance FT-IR spectroscopy. Physically removing CO(g) from the IR cell may lead to a fast decay of adsorbate signals. Our work shows that carbonyls adsorbed on metallic Pt sites fully vanished in less than 10 min at 30 °C upon removing CO(g) when redox supports were used. In contrast, a broad band assigned to CO adsorbed on oxidized Pt sites was stable. It was concluded that physically removing CO(g) at room temperature during IR analyses will most likely lead to changes in the distribution of CO(ads) and a misrepresentation of the Pt site speciation, misguiding the development of efficient low-temperature CO oxidation catalysts. A tentative representation of the nature of the Pt phases present depending on the feed composition is also proposed.https://www.mdpi.com/2073-4344/12/5/532COplatinumFT-IRin situoperando |
| spellingShingle | Frédéric C. Meunier Taha Elgayyar Kassiogé Dembélé Helena Kaper Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO Catalysts CO platinum FT-IR in situ operando |
| title | Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO |
| title_full | Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO |
| title_fullStr | Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO |
| title_full_unstemmed | Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO |
| title_short | Stability of Pt-Adsorbed CO on Catalysts for Room Temperature-Oxidation of CO |
| title_sort | stability of pt adsorbed co on catalysts for room temperature oxidation of co |
| topic | CO platinum FT-IR in situ operando |
| url | https://www.mdpi.com/2073-4344/12/5/532 |
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