Keywords: Organometalic nanoparticles, catalysi
Summary:The development of renewable energies is an essential requirement for a future sustainable world. However, both solar and wind power energies are intermittent and raise questions regarding their real efficiency since energy production can oscillate between shortage and over-production. The power-to-gas approach developed in particular in Germany is an alternative to the smart grid and local electrical storage. It transforms CO2 into methane using hydrogen produced by electrolysis. However, to-date large production units are required which take a long time to start and stop and are therefore not well fitted to intermittence. One idea to circumvent this problem is to use magnetic and catalytic nanoparticles which could be heated by magnetic induction. Thus magnetic heating is instantaneous, in principle the best way to transform electrical energy into heat and therefore well adapted to intermittence. For this purpose we have developed in Toulouse a new generation of iron carbide nanoparticles of unprecedented heating power. The particles are prepared by carbidization of preformed monodisperse Fe(0) nanoparticles under a CO/H2 atmosphere at 150°C. They consist essentially of crystalline Fe2.2C, display a SAR (heating power) of up to 3.3 kW/g and are able to hydrogenate CO2 into methane in a flow reactor after addition of a catalytic Ru or Ni layer and excitation by an alternating magnetic field. The lecture will present the synthesis of the particles, their magnetic properties, their surface modification to deposit a catalytic layer and the development of a flow reactor for selective hydrogenation of CO2 into methane.