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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.

CO$_{2}$ methanation is often performed on Ni/Al$_{2}$O$_{3}$ catalysts, which can suffer from mass transport limitations and, therefore, decreased efficiency. Here we show the application of a hierarchically porous Ni/Al$_{2}$O$_{2}$ catalyst for methanation of CO$_{2}$. 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., N$_{2}$ 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 H$_{2}$-temperature programmed reduction (TPR), showing a high reduction temperature required for activation due to structural incorporation of Ni into the transition alumina. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000127844
Veröffentlicht am 18.12.2020
DOI: 10.3390/catal10121471
Zitationen: 7
Web of Science
Zitationen: 6
Zitationen: 10
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Institut für Technische Chemie und Polymerchemie (ITCP)
Institut für Nanotechnologie (INT)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2073-4344
KITopen-ID: 1000127844
HGF-Programm 37.03.01 (POF III, LK 01) Catalysts and Mechanisms
Erschienen in Catalysts
Verlag MDPI
Band 10
Heft 12
Seiten Art. Nr.: 1471
Vorab online veröffentlicht am 16.12.2020
Schlagwörter methanation; carbon dioxide; hierarchical porosity; nickel; alumina; tomography; porosity analysis
Nachgewiesen in Scopus
Web of Science
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