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What is the difference between gray, blue and green hydrogen?

What is the difference between gray, blue and green hydrogen?

  • Aug 18, 2021
What is the difference between gray, blue and green hydrogen?
Gray hydrogen is obtained from fossil fuels. Steam reformers are used to convert natural gas, for instance, by means of steam addition. The resulting hydrogen-rich synthesis gas is then further processed. During the gray H2 generation process, the carbon dioxide (CO2) by-product escapes into the atmosphere. By contrast, with blue hydrogen, the CO2 is captured in a downstream process. And green hydrogen is produced exclusively from renewable sources. However, so far it has not been possible to produce the green variant of H2 in sufficient quantities.

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