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Open AccessArticle

Evolution of Water Diffusion in a Sorption-Enhanced Methanation Catalyst

1
Institute of Materials and Process Engineering (IMPE), Zurich University of Applied Sciences (ZHAW), Technikumstrasse 9, CH-8401 Winterthur, Switzerland
2
Laboratory for Advanced Analytical Technologies, Swiss Federal Laboratories for Materials Science and Technology (Empa), Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
3
Materials for Energy Conversion, Swiss Federal Laboratories for Materials Science and Technology (Empa), Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
4
Institute of Mechanics, Materials and Civil Engineering (iMMC), Université catholique de Louvain, Place Sainte-Barbe 2, B-1348 Louvain-la-Neuve, Belgium
*
Author to whom correspondence should be addressed.
Catalysts 2018, 8(9), 341; https://doi.org/10.3390/catal8090341
Received: 28 May 2018 / Revised: 18 August 2018 / Accepted: 18 August 2018 / Published: 21 August 2018
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Abstract

Sorption-enhanced methanation has consequent advantages compared to conventional methanation approaches; namely, the production of pure methane and enhanced kinetics thanks to the application of Le Châtelier’s principle. In this paper, we address the question of the long-term stability of a sorption-enhanced methanation catalyst-support couple: Ni nanoparticles on zeolite 5A. Compared to most conventional methanation processes the operational conditions of sorption-enhanced methanation are relatively mild, which allow for stable catalyst activity on the long term. Indeed, we show here that neither coking nor thermal degradation come into play under such conditions. However, a degradation mechanism specific to the sorption catalysis was observed under cyclic methanation/drying periods. This severely affects water diffusion kinetics in the zeolite support, as shown here by a decrease of the water-diffusion coefficient during multiple cycling. Water diffusion is a central mechanism in the sorption-enhanced methanation process, since it is rate-limiting for both methanation and drying. View Full-Text
Keywords: CO2 methanation; catalysis; water sorption; water diffusion CO2 methanation; catalysis; water sorption; water diffusion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Delmelle, R.; Terreni, J.; Remhof, A.; Heel, A.; Proost, J.; Borgschulte, A. Evolution of Water Diffusion in a Sorption-Enhanced Methanation Catalyst. Catalysts 2018, 8, 341.

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