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Hydrogen liquefier and air separation unit at Leuna, Germany.

H2 Production

One of the main benefits of hydrogen is its versatility – it can be produced from any primary energy source which makes it limitless in terms of availability. The basic distinction is made between conventional gray hydrogen production based on fossil feedstocks, e.g. through steam reforming of natural gas, and low-carbon hydrogen production based on renewable feedstocks such as biogenous processes (biomass gasification or biogas reforming etc.) or electrolysis of water (H2O) with wind power, hydro or solar energy.

Today, hydrogen is mainly produced by steam reforming fossil fuels such as natural gas. Excess hydrogen is also recovered as a byproduct from various industrial processes. Even though hydrogen generated from fossil feedstocks has the advantage of zero-tailpipe emissions, the production chain still leaves a carbon footprint. Well-to-wheel emissions of a hydrogen fuel-cell car are nonetheless approximately 30% lower than those of a conventional diesel-powered car.

Building on these conventional hydrogen production techniques and Linde’s experience of more than 100 years of H2 production, we are actively developing technologies to ultimately increase the share of renewably produced hydrogen.

Our long-term aim is to significantly increase the sustainable share in the hydrogen mix using renewable energy sources such as wind, water and biomass. At present, electrolysis and reforming of biogas are viable alternatives that offer a zero-emission hydrogen energy cycle.

For instance, following extensive studies and laboratory tests, we are co-operating a Power to Gas plant located in Mainz, Germany. In this facility, wind power is used to produce hydrogen via electrolysis and transported to customers such as hydrogen fueling stations.

Hydrogen and synthesis gas plants

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