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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Evolution of water diffusion in a sorption-enhanced methanation catalyst
Authors: Delmelle, Renaud
Terreni, Jasmin
Remhof, Arndt
Heel, Andre
Proost, Joris
Borgschulte, Andreas
DOI: 10.21256/zhaw-4705
Published in: Catalysts
Volume(Issue): 8
Issue: 9
Issue Date: Aug-2018
Publisher / Ed. Institution: MDPI
ISSN: 2073-4344
Language: English
Subjects: CO2 methanation; Catalysis; Water sorption; Water diffusion
Subject (DDC): 540: Chemistry
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.
Fulltext version: Published version
License (according to publishing contract): CC BY 4.0: Attribution 4.0 International
Departement: School of Engineering
Organisational Unit: Institute of Materials and Process Engineering (IMPE)
Published as part of the ZHAW project: SMARTCAT - Entwicklung eines „Smart-Konzepts“ für ein Biogas-Upgrade durch kontinuierliche CO2 Methanisierung
Appears in collections:Publikationen School of Engineering

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