Renewable Hydrogen Production through the Purification of Syngas into Metal Hydrides in an Integrated Electrolysis and Biomass Gasification Plant

Hydrogen produced from renewable sources will play a pivotal role in the transition to a decarbonized economy, in particular in the transportation and industrial sector. However, this pathway faces several challenges in terms of cost, efficiency, lifetime, etc. Several technologies can be used to produced renewable hydrogen. Among them, water electrolysis and biomass gasification offer a high level of maturity, and their integration can improve the availability of hydrogen from renewable sources, reducing the impact of fluctuating sources, such as solar or wind, while offering the possibility of supplying not only hydrogen, but also other valuable products for biofuel production. This integration requires the implementation of suitable purification methods to extract the hydrogen from the syngas produced in the gasification process. This work presents an experimental purification facility for syngas using metal hydrides based on a FeTi alloy. The evaluation of this facility will analyse, after successive loading and unloading cycles, the purity of the gas obtained, the CO2 and CO absorption capacity of the hydrides, the lifetime of this system in terms of number of cycles, the regeneration capacity, the total energy efficiency of the process, etc. Preliminary results of this evaluation will be presented at the congress. Key words. Hydrogen production, biomass gasification, water electrolysis, hydrogen purification, metal hydride