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Open AccessArticle

Porosity and Structure of Hierarchically Porous Ni/Al2O3 Catalysts for CO2 Methanation

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Institute of Catalysis Research and Technology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
2
Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 20, 76131 Karlsruhe, Germany
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Institute of Chemical Technology, Universität Leipzig, Linnéstr. 3, 04103 Leipzig, Germany
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Chair for Process Systems Engineering, Institute of Process Engineering, Otto-von-Guericke University Magdeburg, Universitätplatz 2, 39106 Magdeburg, Germany
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Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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Department of Materials and Earth Sciences, Technische Universität Darmstadt, Alarich-Weiss-Straße 2, 64287 Darmstadt, Germany
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Max Planck Institute Magdeburg, Department Process Systems Engineering, Sandtorstraße 1, 39106 Magdeburg, Germany
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Diamond Light Source, Harwell Science and Innovation Campus, Fermi Ave, Didcot OX11 0DE, UK
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Karlsruhe Nano Micro Facility, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(12), 1471; https://doi.org/10.3390/catal10121471
Received: 29 November 2020 / Revised: 8 December 2020 / Accepted: 10 December 2020 / Published: 16 December 2020
(This article belongs to the Special Issue Design of Heterogeneous Catalysts and Adsorbents)
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. View Full-Text
Keywords: methanation; carbon dioxide; hierarchical porosity; nickel; alumina; tomography; porosity analysis methanation; carbon dioxide; hierarchical porosity; nickel; alumina; tomography; porosity analysis
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MDPI and ACS Style

Weber, S.; Abel, K.L.; Zimmermann, R.T.; Huang, X.; Bremer, J.; Rihko-Struckmann, L.K.; Batey, D.; Cipiccia, S.; Titus, J.; Poppitz, D.; Kübel, C.; Sundmacher, K.; Gläser, R.; Sheppard, T.L. Porosity and Structure of Hierarchically Porous Ni/Al2O3 Catalysts for CO2 Methanation. Catalysts 2020, 10, 1471. https://doi.org/10.3390/catal10121471

AMA Style

Weber S, Abel KL, Zimmermann RT, Huang X, Bremer J, Rihko-Struckmann LK, Batey D, Cipiccia S, Titus J, Poppitz D, Kübel C, Sundmacher K, Gläser R, Sheppard TL. Porosity and Structure of Hierarchically Porous Ni/Al2O3 Catalysts for CO2 Methanation. Catalysts. 2020; 10(12):1471. https://doi.org/10.3390/catal10121471

Chicago/Turabian Style

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" Catalysts 10, no. 12: 1471. https://doi.org/10.3390/catal10121471

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