# Improving energy efficiency of magnetic CO$_{2}$ methanation by modifying coil design, heating agents, and by using eddy currents as the complementary heating source

Faure, Stéphane; Kale, Sumeet S. 1; Mille, Nicolas; Cayez, Simon; Ourlin, Thibault; Soulantica, Katerina; Carrey, Julian; Chaudret, Bruno
1 Institut für Technische Chemie und Polymerchemie (ITCP), Karlsruher Institut für Technologie (KIT)

## Abstract:

The Sabatier reaction activated by high-frequency magnetic fields is a promising approach for the power-to-gas process because of expected high energy efficiencies and fast switch-on times. Recent progresses have been achieved by combining nanoparticles displaying both a high heating power and a good catalytic activity. Here, we alternatively use iron microparticles associated with our own-designed Ni/CeO$_{2}$ catalyst. The heating agent is cheap and abundant, and we demonstrate that the presence of eddy currents in the system improves its heating performance. The contribution of eddy currents to global heating is successfully determined by an original protocol consisting in comparing a calorimetric and a high-frequency hysteresis loop-based method to measure heating power. In addition, the optimization of the catalyst bed using SiC-spacers limits sintering and thus improves the durability of the catalyst. The energy efficiency of the catalysis process, calculated as a function of coil consumption and gas flow, is clearly improved by the use of an air-cooled Litz wire coil. These improvements are a step forward toward the development of a cheap and efficient process for chemical energy storage.

 Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP) Publikationstyp Zeitschriftenaufsatz Publikationsmonat/-jahr 01.2021 Sprache Englisch Identifikator ISSN: 0021-8979, 1089-7550 KITopen-ID: 1000135544 Erschienen in Journal of applied physics Verlag American Institute of Physics (AIP) Band 129 Heft 4 Seiten Art.-Nr.: 044901 Nachgewiesen in DimensionsScopusWeb of Science
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
KITopen Landing Page