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Porosity and structure of hierarchically porous Ni/Al₂O₃ catalysts for CO₂ methanation

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. (2020)
Porosity and structure of hierarchically porous Ni/Al₂O₃ catalysts for CO₂ methanation.
In: Catalysts, 10 (12)
doi: 10.3390/catal10121471
Article, Bibliographie

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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.

Item Type: Article
Erschienen: 2020
Creators: 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.
Type of entry: Bibliographie
Title: Porosity and structure of hierarchically porous Ni/Al₂O₃ catalysts for CO₂ methanation
Language: English
Date: 2020
Place of Publication: Basel
Publisher: MDPI
Journal or Publication Title: Catalysts
Volume of the journal: 10
Issue Number: 12
Collation: 22 Seiten
DOI: 10.3390/catal10121471
Corresponding Links:
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.

Uncontrolled Keywords: methanation, carbon dioxide, hierarchical porosity, nickel, alumina, tomography, porosity analysis
Additional Information:

This article belongs to the Special Issue Design of Heterogeneous Catalysts and Adsorbents

Classification DDC: 500 Science and mathematics > 540 Chemistry
600 Technology, medicine, applied sciences > 660 Chemical engineering
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > In-situ electron microscopy
Date Deposited: 16 Jan 2024 07:23
Last Modified: 16 Jan 2024 07:23
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