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The "colors" of hydrogen, its sustainable production and the role of hydrogen in the energy transition.

Colors of H2

Hydrogen: Colorful variety

Not all hydrogen is the same - colors play a decisive role in its classification.

Hydrogen produced in a CO2-neutral manner is the means of choice for achieving climate neutrality in industrial processes and production as well as in logistics processes and public transport.

... also called renewable hydrogen, is produced by electrolysis of water, whereby the electricity required for this must come exclusively from renewable energy sources. This makes its production CO2-neutral.

... is obtained from fossil fuels, usually natural gas. The steam reforming process used in this process also produces CO2, which escapes unused into the atmosphere. The production of one ton of hydrogen causes about ten tons of CO2.

... is basically gray hydrogen, whereby the CO2 is captured during production and permanently stored in geological formations (Carbon Capture and Storage, CCS) or used in other applications, e.g. in building materials (Carbon Capture and Utilization, CCU). Since the CO2 is not released into the atmosphere, the production of blue hydrogen is considered CO2-neutral.

... comes from the thermal cracking of methane (methane pyrolysis). Instead of CO2, solid carbon is produced. For turquoise hydrogen to be considered CO2-neutral, the heat supply of the high-temperature reactor must come from renewable energy sources and the carbon must be permanently sequestered - unless the methane comes from biogenic sources.

... is also produced from the electrolysis of water, but the electricity used for this comes from nuclear power plants. Since no CO2 emissions are produced, the production of pink hydrogen is considered climate-neutral.

... is generated from biomass or with electricity from waste management, for example from waste incineration plants or biogas plants.

Hydrogen production: electrolysis of water Part 1/2

Hydrogen production: electrolysis of water

Whether as an energy storage medium, fuel or basic material for chemical processes – green hydrogen is considered to be the ultimate energy carrier of the future. Low-temperature water electrolysis is used to produce clean hydrogen, and a distinction is made between three basic processes:

Accordeon - Hydrogen production: electrolysis of water

Hydrogen production: electrolysis of water Part 2/2

For industrial hydrogen production, alkaline water electrolysis and polymer electrolyte membrane water electrolysis have already become established. In a direct comparison, the latter offers numerous advantages, which is why Messer prefers the PEMWE process.

In addition to the two established processes, the industrial use of anion exchange membrane water electrolysis (AEMWE) and high-temperature electrolysis called solid oxide electrolysis (SOEL) are currently being investigated.

Hydrogen value chain: Multiple benefits in the energy transition

Hydrogen value chain: Multiple benefits in the energy transition


1. Renewable energies
Electricity is generated from sources that do not cause CO2 emissions, such as photovoltaics, wind and hydropower.

2. Electrolysis
This process uses renewable electrical energy to separate the two components of the water molecule, hydrogen and oxygen.

3. Storage
Hydrogen is a gas that can be stored in compressed or liquid form. Its high gravimetric energy density makes hydrogen a good energy carrier and a perfect complement to renewable energy. In the energy transition, hydrogen plays an essential role in exploiting the full potential of solar, wind or hydropower.

4. Fuel
Hydrogen is produced from renewable electricity by electrolysis and can serve as a climate-friendly and sustainable alternative to fossil fuels.

5. Distribution
The hydrogen is distributed to the various supply points.

6. Applications
Among the many applications, the most important are mobility and industry (refineries, fertilizer production, etc.).

7. Sustainable mobility
The drive system of fuel cell-powered vehicles essentially consists of an electric motor, a fuel cell that acts as a generator, a battery for storing the energy, and storage tanks for the hydrogen. Advantages of this solution for mobility:

  • Emission-free
  • Good autonomy
  • Fast and easy refueling
  • Low fuel consumption


Hydrogen policy: Defined climate targets

Hydrogen policy: Defined climate targets

Efforts are being made worldwide to counter the progressive warming of the earth's atmosphere and the associated climate change. 

The European Union wants to become the first climate-neutral continent. Specifically, the European "Green Deal" envisages no more net greenhouse gas emissions by 2050. Germany plans to achieve climate neutrality in 2045. The USA wants to halve emissions of climate-damaging CO2 by 2030 compared to 2005 and be climate-neutral by 2050 at the latest. China is also committed to the goals of the Paris climate agreement.

Since 2019, the family-owned company Messer has been aligning itself with the UN Sustainable Development Goals. Through better utilization of existing production facilities and targeted projects that sustainably increase the energy efficiency of the plants, the specific energy consumption of Messer's own air separation plants is to be reduced further and further. To this end, Messer has set itself the target of reducing energy consumption by 0.7 percent per year by 2025; in total, this amounts to a reduction of almost 3.5 percent. In addition, Messer is making a further, significant contribution to decarbonization through the increasing use of renewable forms of energy.

In Europe, the European Commission's hydrogen strategy (2020) plays an important role in the decarbonization of transport and industry. It aims to create 6 GW of electrolysis capacity by 2024 and 40 GW of electrolysis capacity by 2030. The so-called 'Fit for 55' package of measures (2021) proposes, among other things, targets for the use of renewable hydrogen: 2.6% in transport and 50% in industry by 2030. The demand for hydrogen is to be met mainly by water electrolysis.

Rising EUA prices, stricter framework conditions in CO2 emissions trading, and incentives to switch to clean drive systems, including in local public transport, are further criteria for investment decisions in the direction of climate neutrality.

To support industry and companies on this path, Messer is ready with application technology expertise and products - including clean hydrogen. Through our presence in Europe, the USA and Asia, we are also familiar with the respective government programs to promote clean hydrogen projects and provide support in taking advantage of the associated opportunities.