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Methanation of CO₂: Insight into deactivation mechanisms and catalyst stability under dynamic reaction conditions

Mutz, Benjamin

Abstract (englisch):
In a future power supply system mainly based on renewable sources, long-term energy storage systems are crucial to replace the depleting fossil fuel reserves gradually and to balance seasonal fluctuations of energy generated by wind and sunlight. The strategy of choice comprises chemical energy carriers of high energy density, which can be generated within the “power-to-chemicals” concept using renewable H₂ from water electrolysis and the greenhouse gas CO₂. Such reactions and processes are well studied during steady state operation. However, for the utilization of power from fluctuating renewable sources, the processes and especially the catalyst systems must tolerate the dynamic supply of energy and, thus, H₂. Therefore, new challenges in process control and catalyst design arise keeping in mind that the catalyst itself is also a dynamic system. In this thesis, the methanation of CO₂ was studied as an exemplary reaction to produce a chemical energy carrier with a fluctuating H₂ supply to gain first insights into the dynamics of the process and its impact on the catalyst structure and performance.

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Volltext §
DOI: 10.5445/IR/1000083073
Veröffentlicht am 28.05.2018
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Institut für Katalyseforschung und -technologie (IKFT)
Publikationstyp Hochschulschrift
Publikationsjahr 2018
Sprache Englisch
Identifikator urn:nbn:de:swb:90-830732
KITopen-ID: 1000083073
HGF-Programm 37.01.01 (POF III, LK 01)
Fundamentals and Materials
Verlag KIT, Karlsruhe
Umfang XIII, 158, LXXV S.
Art der Arbeit Dissertation
Fakultät Fakultät für Chemie und Biowissenschaften (CHEM-BIO)
Institut Institut für Technische Chemie und Polymerchemie (ITCP)
Prüfungsdatum 24.07.2017
Referent/Betreuer Prof. J.-D. Grunwaldt
Schlagwörter CO₂ Methanation; Nickel catalyst; Ni₃Fe-alloy; operando spectroscopy; dynamic reaction conditions; long-term performance; deactivation / reactivation
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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