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I13-1-Coherence	Porosity and structure of hierarchically porous Ni/Al2O3 catalysts for CO2 methanation Sebastian Weber , Ken L. Abel , Ronny T. Zimmermann , Xiaohui Huang , Jens Bremer , Liisa K. Rihko-Struckmann , Darren Batey , Silvia Cipiccia , Juliane Titus , David Poppitz , Christian Kübel , Kai Sundmacher , Roger Gläser , Thomas L. Sheppard Catalysts 10 DOI: 10.3390/catal10121471 Diamond Proposal Number(s): [24079] Open Access Show Abstract ▼ 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.	Dec 2020

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I13-1-Coherence

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