Throughout 2021, the so-called green hydrogen has attracted much attention as a powerful tool for moving towards a decarbonised economy. Currently, green hydrogen tends to be identified with hydrogen produced by electrolysis from renewable energies, mainly wind and photovoltaic. However, there exists alternative procedures to electrolysis capable of generating CO2-neutral hydrogen, such as biomethane reforming or biomass gasification. Indeed, the technological maturity of steam reforming (SMR) is more than consolidated due to the fact that it is currently the most widely used process to produce hydrogen for industrial use, although it uses natural gas as a raw material, producing the so-called grey hydrogen, which can be transformed into blue if the CO2 released in the process is captured. If natural gas is replaced by biomethane, emissions would be CO2 neutral, as it is biogenic. This process was already carried out on an industrial scale in Spain last October.
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