The impact of support material of cobalt‐based catalysts prepared by double flame spray pyrolysis on CO2 methanation dynamics

peer-reviewed
Erstveröffentlichung
2022-07-14Autoren
Gäßler, Max
Stahl, Jakob
Schowalter, Marco
Pokhrel, Suman
Rosenauer, Andreas
Wissenschaftlicher Artikel
Erschienen in
ChemCatChem ; 14 (2022), 16. - Art.-Nr. e202200286. - ISSN 1867-3880. - eISSN 1867-3899
Link zur Originalveröffentlichung
https://dx.doi.org/10.1002/cctc.202200286Fakultäten
Fakultät für NaturwissenschaftenInstitutionen
Institut für ChemieingenieurwesenDokumentversion
Veröffentlichte Version (Verlags-PDF)Zusammenfassung
Behavior: Well-defined model catalysts synthesized by double flame spray pyrolysis are investigated with time-resolved periodic experimentation upon transient kinetic behavior for CO2 methanation. The effect of SiO2, TiO2 and SiO2-TiO2 mixed support was isolated due to identical Co particle size distributions. Sorption-enhancement of CH4 formation by TiO2 was found.
Methanation is capable of chemical storage of fluctuating renewable energy, which requires fundamental understanding of the dynamics of the kinetic processes taking place on the catalyst surface. In order to elucidate the impact of the catalyst support on the dynamics, Co‐based model catalysts were synthesized via double flame spray pyrolysis (DFSP) differing only in the support materials. In particular, Co nanoparticles of identical particle size distributions are supported on SiO2, TiO2 and SiO2‐TiO2 mixtures by independent formation of the support and the active metal by means of DFSP. The transient catalyst behavior was studied by step changes of the feed gas composition and the analysis of the reactor response with high temporal resolution, according to the periodic transient kinetics method. It was revealed that H2O adsorption strongly depends on the support with increasing sorption capacity from SiO2, via SiO2‐TiO2 to TiO2. The storage of H2O on the support induces a sorption‐enhancement effect and thereby promotes the transient CH4 formation rate for Co/TiO2 catalysts. Transient experiments before and after a steady‐state operation period under CO2 methanation reveal an unchanging reaction mechanism, while changes in selectivity towards CH4 and CO are observed together with a certain degree of deactivation. Hence, the support material was identified to play a major role in activity, selectivity and deactivation behavior for supported Co catalysts in CO2 methanation.
Publikationsförderung
Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 491116205
Wird ergänzt durch
https://chemistry-europe.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1002%2Fcctc.202200286&file=cctc202200286-sup-0001-misc_information.pdfSchlagwörter
[GND]: Heterogene Katalyse[LCSH]: Heterogeneous catalysis
[Freie Schlagwörter]: CO2 methanation | double flame spray pyrolysis | heterogeneous catalysis | transient experimentation | support effect
[DDC Sachgruppe]: DDC 540 / Chemistry & allied sciences
Metadata
Zur LanganzeigeDOI & Zitiervorlage
Nutzen Sie bitte diesen Identifier für Zitate & Links: http://dx.doi.org/10.18725/OPARU-47920
Gäßler, Max et al. (2023): The impact of support material of cobalt‐based catalysts prepared by double flame spray pyrolysis on CO2 methanation dynamics. Open Access Repositorium der Universität Ulm und Technischen Hochschule Ulm. http://dx.doi.org/10.18725/OPARU-47920
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