Syngas Production Through H2O/CO2 Thermochemical Splitting Over Doped Ceria-Zirconia Materials
This study investigates the catalytic properties of K+ and Cu2 + /Fe3 + co-doped ceria-zirconia (CeZr) toward water and carbon dioxide co-splitting. These materials can convert separate feeds of CO2 and H2O into CO and H2. In co-splitting tests, water reacts faster on the K-Cu-CeZr catalyst with ne...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2020-10-01
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| Series: | Frontiers in Energy Research |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fenrg.2020.00204/full |
| _version_ | 1818514427817754624 |
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| author | Giuseppina Luciani Gianluca Landi Almerinda Di Benedetto |
| author_facet | Giuseppina Luciani Gianluca Landi Almerinda Di Benedetto |
| author_sort | Giuseppina Luciani |
| collection | DOAJ |
| description | This study investigates the catalytic properties of K+ and Cu2 + /Fe3 + co-doped ceria-zirconia (CeZr) toward water and carbon dioxide co-splitting. These materials can convert separate feeds of CO2 and H2O into CO and H2. In co-splitting tests, water reacts faster on the K-Cu-CeZr catalyst with negligible CO production. The reduction of the K-Fe-CeZr catalyst occurs over two broad temperature ranges: at low temperature, only H2 is produced; whereas CO is the most abundant product at high temperature. A kinetic model was developed to get insights into the reasons of the observed selectivity toward H2 at low temperature and CO at a higher temperature. The different reaction orders in the sites fraction were evaluated for CO2 and H2O reactions, highlighting that H2 production requires a larger number of adjacent reduced sites than CO production. Three regimes were identified through the model: Regime I- H2O driven regime @T ≤ 650°C; Regime II- mixed regime @ 560 < T < 700°C and Regime III: CO2 driven regime @ T > 700°C. These results indicate the appropriate conditions for tuning H2/CO selectivity, depending on the feed composition. |
| first_indexed | 2024-12-11T00:15:39Z |
| format | Article |
| id | doaj.art-d7b757107d2347fbb5a2e0732f7bc4af |
| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-12-11T00:15:39Z |
| publishDate | 2020-10-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Energy Research |
| spelling | doaj.art-d7b757107d2347fbb5a2e0732f7bc4af2022-12-22T01:27:58ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2020-10-01810.3389/fenrg.2020.00204565807Syngas Production Through H2O/CO2 Thermochemical Splitting Over Doped Ceria-Zirconia MaterialsGiuseppina Luciani0Gianluca Landi1Almerinda Di Benedetto2Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università di Napoli Federico II, Naples, ItalyIstituto di Ricerche sulla Combustione – CNR, Naples, ItalyDipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università di Napoli Federico II, Naples, ItalyThis study investigates the catalytic properties of K+ and Cu2 + /Fe3 + co-doped ceria-zirconia (CeZr) toward water and carbon dioxide co-splitting. These materials can convert separate feeds of CO2 and H2O into CO and H2. In co-splitting tests, water reacts faster on the K-Cu-CeZr catalyst with negligible CO production. The reduction of the K-Fe-CeZr catalyst occurs over two broad temperature ranges: at low temperature, only H2 is produced; whereas CO is the most abundant product at high temperature. A kinetic model was developed to get insights into the reasons of the observed selectivity toward H2 at low temperature and CO at a higher temperature. The different reaction orders in the sites fraction were evaluated for CO2 and H2O reactions, highlighting that H2 production requires a larger number of adjacent reduced sites than CO production. Three regimes were identified through the model: Regime I- H2O driven regime @T ≤ 650°C; Regime II- mixed regime @ 560 < T < 700°C and Regime III: CO2 driven regime @ T > 700°C. These results indicate the appropriate conditions for tuning H2/CO selectivity, depending on the feed composition.https://www.frontiersin.org/article/10.3389/fenrg.2020.00204/fullthermochemical water splittingthermochemical CO2 splittingsustainable energytransition metalspotassiumceria-zirconia |
| spellingShingle | Giuseppina Luciani Gianluca Landi Almerinda Di Benedetto Syngas Production Through H2O/CO2 Thermochemical Splitting Over Doped Ceria-Zirconia Materials Frontiers in Energy Research thermochemical water splitting thermochemical CO2 splitting sustainable energy transition metals potassium ceria-zirconia |
| title | Syngas Production Through H2O/CO2 Thermochemical Splitting Over Doped Ceria-Zirconia Materials |
| title_full | Syngas Production Through H2O/CO2 Thermochemical Splitting Over Doped Ceria-Zirconia Materials |
| title_fullStr | Syngas Production Through H2O/CO2 Thermochemical Splitting Over Doped Ceria-Zirconia Materials |
| title_full_unstemmed | Syngas Production Through H2O/CO2 Thermochemical Splitting Over Doped Ceria-Zirconia Materials |
| title_short | Syngas Production Through H2O/CO2 Thermochemical Splitting Over Doped Ceria-Zirconia Materials |
| title_sort | syngas production through h2o co2 thermochemical splitting over doped ceria zirconia materials |
| topic | thermochemical water splitting thermochemical CO2 splitting sustainable energy transition metals potassium ceria-zirconia |
| url | https://www.frontiersin.org/article/10.3389/fenrg.2020.00204/full |
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