Weber, Sebastian ; Abel, Ken L. ; Zimmermann, Ronny T. ; Huang, Xiaohui ; Bremer, Jens ; Rihko-Struckmann, Liisa K. ; Batey, Darren ; Cipiccia, Silvia ; Titus, Juliane ; Poppitz, David ; Kübel, Christian ; Sundmacher, Kai ; Gläser, Roger ; Sheppard, Thomas L. (2024)
Porosity and Structure of Hierarchically Porous Ni/Al₂O₃ Catalysts for CO₂ Methanation.
In: Catalysts, 2020, 10 (12)
doi: 10.26083/tuprints-00017428
Artikel, Zweitveröffentlichung, Verlagsversion
 | Es ist eine neuere Version dieses Eintrags verfügbar. |
Kurzbeschreibung (Abstract)
CO₂ methanation is often performed on Ni/Al₂O₃ catalysts, which can suffer from mass transport limitations and, therefore, decreased efficiency. Here we show the application of a hierarchically porous Ni/Al₂O₃ catalyst for methanation of CO₂. The material has a well-defined and connected meso- and macropore structure with a total porosity of 78%. The pore structure was thoroughly studied with conventional methods, i.e., N₂ sorption, Hg porosimetry, and He pycnometry, and advanced imaging techniques, i.e., electron tomography and ptychographic X-ray computed tomography. Tomography can quantify the pore system in a manner that is not possible using conventional porosimetry. Macrokinetic simulations were performed based on the measures obtained by porosity analysis. These show the potential benefit of enhanced mass-transfer properties of the hierarchical pore system compared to a pure mesoporous catalyst at industrially relevant conditions. Besides the investigation of the pore system, the catalyst was studied by Rietveld refinement, diffuse reflectance ultraviolet-visible (DRUV/vis) spectroscopy, and H₂-temperature programmed reduction (TPR), showing a high reduction temperature required for activation due to structural incorporation of Ni into the transition alumina. The reduced hierarchically porous Ni/Al₂O₃ catalyst is highly active in CO₂ methanation, showing comparable conversion and selectivity for CH₄ to an industrial reference catalyst.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Weber, Sebastian ; Abel, Ken L. ; Zimmermann, Ronny T. ; Huang, Xiaohui ; Bremer, Jens ; Rihko-Struckmann, Liisa K. ; Batey, Darren ; Cipiccia, Silvia ; Titus, Juliane ; Poppitz, David ; Kübel, Christian ; Sundmacher, Kai ; Gläser, Roger ; Sheppard, Thomas L. |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Porosity and Structure of Hierarchically Porous Ni/Al₂O₃ Catalysts for CO₂ Methanation |
| Sprache: | Englisch |
| Publikationsjahr: | 15 Januar 2024 |
| Ort: | Darmstadt |
| Publikationsdatum der Erstveröffentlichung: | 2020 |
| Ort der Erstveröffentlichung: | Basel |
| Verlag: | MDPI |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Catalysts |
| Jahrgang/Volume einer Zeitschrift: | 10 |
| (Heft-)Nummer: | 12 |
| Kollation: | 22 Seiten |
| DOI: | 10.26083/tuprints-00017428 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/17428 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung DeepGreen |
| Kurzbeschreibung (Abstract): | CO₂ methanation is often performed on Ni/Al₂O₃ catalysts, which can suffer from mass transport limitations and, therefore, decreased efficiency. Here we show the application of a hierarchically porous Ni/Al₂O₃ catalyst for methanation of CO₂. The material has a well-defined and connected meso- and macropore structure with a total porosity of 78%. The pore structure was thoroughly studied with conventional methods, i.e., N₂ sorption, Hg porosimetry, and He pycnometry, and advanced imaging techniques, i.e., electron tomography and ptychographic X-ray computed tomography. Tomography can quantify the pore system in a manner that is not possible using conventional porosimetry. Macrokinetic simulations were performed based on the measures obtained by porosity analysis. These show the potential benefit of enhanced mass-transfer properties of the hierarchical pore system compared to a pure mesoporous catalyst at industrially relevant conditions. Besides the investigation of the pore system, the catalyst was studied by Rietveld refinement, diffuse reflectance ultraviolet-visible (DRUV/vis) spectroscopy, and H₂-temperature programmed reduction (TPR), showing a high reduction temperature required for activation due to structural incorporation of Ni into the transition alumina. The reduced hierarchically porous Ni/Al₂O₃ catalyst is highly active in CO₂ methanation, showing comparable conversion and selectivity for CH₄ to an industrial reference catalyst. |
| Freie Schlagworte: | methanation, carbon dioxide, hierarchical porosity, nickel, alumina, tomography, porosity analysis |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-174281 |
| Zusätzliche Informationen: | This article belongs to the Special Issue Design of Heterogeneous Catalysts and Adsorbents |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 540 Chemie 600 Technik, Medizin, angewandte Wissenschaften > 660 Technische Chemie |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > In-Situ Elektronenmikroskopie |
| Hinterlegungsdatum: | 15 Jan 2024 13:49 |
| Letzte Änderung: | 16 Jan 2024 07:22 |
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| Suche nach Titel in: | TUfind oder in Google |
Verfügbare Versionen dieses Eintrags
- Porosity and Structure of Hierarchically Porous Ni/Al₂O₃ Catalysts for CO₂ Methanation. (deposited 15 Jan 2024 13:49) [Gegenwärtig angezeigt]
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