Evolution of Water Diffusion in a Sorption-Enhanced Methanation Catalyst
(2018) Catalysts — Vol. 8, n° 9, p. 341 (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.
- Affiliations
Zurich University of Applied Sciences Institute of Materials and Process Engineering Swiss Federal Laboratories for Materials Science and Technology Laboratory for Advanced Analytical Technologies Swiss Federal Laboratories for Materials Science and Technology Materials for Energy Conversion
Citations
Delmelle, R., Terreni, J., Remhof, A., Heel, A., Proost, J., & Borgschulte, A. (2018). Evolution of Water Diffusion in a Sorption-Enhanced Methanation Catalyst. Catalysts, 8(9), 341. https://doi.org/10.3390/catal8090341 (registering DOI) (Original work published 2018)