Even though hydrogen is actually a colorless gas it comes in all kinds of colors Today hydrogen is green gray blue and turquoise because there s a color etiquette based on what H2 is produced from Green hydrogen is produced from water by means of electrolysis and the electric power this takes is generated by renewable energy sources such as the sun wind or hydropower By contrast gray hydrogen is produced from fossil fuels typically natural gas that s transformed into hydrogen and CO2 by application of heat a process that s also known as steam reformation This has the disadvantage of the CO2 generated in the process being released into the atmosphere plus the production of one metric ton 1 10 short tons of hydrogen generates about ten metric tons eleven short tons of CO2 Blue hydrogen is produced from natural gas as well However the CO2 is permanently stored in deep geological layers on land or under the seabed as solid or gaseous carbon The advantage of the so called carbon capture and storage CCS method is that the carbon dioxide is not released into the atmosphere Blue is regarded as a transitional technology toward green hydrogen However the methods it involves are controversial because critics fear that it may entail huge environmental risks Turquoise hydrogen is a mix of blue and green hydrogen and produced by thermal fi ssion of methane Unlike in the case of blue hydrogen the use of methane pyrolysis does not even produce any gaseous CO2 but carbon or carbon compounds Again the crucial factor is whether or not green electricity is used in this process Conclusion Ultimately only the production of green hydrogen is a clean method for producing hydrogen from the environmental point of view H2 color theory Dr Stefan Gossens It s unlikely that we ll be able to produce all the green energy in places where it s needed There s no way around imports for us and other EU countries so we need to emphasize international cooperation Green hydrogen in other words hydrogen produced by means of renewable energies will reduce emissions in a wide range of applications such as steel and concrete production refi neries decentralized heat and energy generation and mobility 61 Here and now

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