Welcome! Let’s grow the hydrogen economy together. Let’s grow the hydrogen community! Questions & Answers What are the different kinds of hydrogen available in the market?

  • Ajay Upadhaya

    October 11, 2022 at 22:09

    The Hydrogen are distinguished by different colours based on what is the source of production,

    Grey Hydrogen: Hydrogen extracted from Natural gas by the process called Steam methane reforming (SMR). The remaining CO2 from the reaction is released into the atmosphere. Today majority of total Hydrogen produced worldwide is based on this pathway because its cheaper to produce and matured method. We need to shift towards other pathway to achieve energy transition through more Sustainable methods.

    Brown Hydrogen: Hydrogen extracted from coal using gasification process. Most environmentally damaging pathway.

    Blue Hydrogen: It is an extention of of above method, but here the CO2 from the reaction is captured by carbon capture technology. Depending on CCS, 60% or 85-95% of carbon dioxide could be captured which leads to Sustainable pathway compared to Grey Hydrogen.

    Pink Hydrogen: It uses an electrolysis process to split water molecules into Hydrogen and oxygen from a device called Electrolysers powered by nuclear electricity.

    Green Hydrogen: Electrolysers are powered by renewable electricity to produce Hydrogen by spliting water using electrolysis process. PEM and Alkaline are most commonly used types of electrolysers.

    Above five colours are most common types of Hydrogen colours you will hear in most discussions,

    There are some more,

    Yellow: Electrolysers are powered by grid electricity with mixed fossil sourced,nuclear, and renewable electricity to produce Hydrogen by spliting water using electrolysis.

    Turquoise Hydrogen: Hydrogen I’d produces by methane pyrolysis where thermal splitting of methane occurs. The byproduct is just solid carbon in place CO2 in Grey Hydrogen type.

    White H2 : Naturally occuring Hydrogen, rarely found.

    Red Hydrogen: High temperature catalytic process using nuclear power.

    There are others methods to produce Hydrogen as well such as Biomass gasification, Biomass derived liquid reforming, solar thermochemical Hydrogen, photoelectrochemical, photo biological, microbial Biomass conversion. Hydrogen yield are very low through these process, and methods are not in commercial stage yet.

    I hope this answers your questions, let me know if you are aware of other pathway for Hydrogen production. In my opinion, we should emphasis much on Green Hydrogen since its the only truly carbon friendly solution that has Hydrogen production potentials at large scale, much needed for energy transitions.

    • Jerryn Joy

      October 13, 2022 at 19:38

      Hello Ajay Upadhaya,

      Thank you for your detailed answer.

      Yes, the companies need to focus on Green Hydrogen for zero emissions.

  • Brad Reams

    October 17, 2022 at 00:09

    While Ajay identified the types of Hydrogen correctly, we need to move away from the act of identifying hydrogen by color and instead identify it by carbon intensity score. Since incentives and credits will be determined by the carbon intensity, we should start concentrating on this type of identification.

    • Jerryn Joy

      October 24, 2022 at 15:14

      Hello Brad Reams,

      Yes, I agree with that point. Since, the amount of carbon emissions is what matters during each type of hydrogen production and defining a carbon intensity score will be much more meaningful…

  • Brian Hudson

    April 24, 2023 at 20:48

    Liquid Hydrogen, Cryo Compressed, Gaseous, Solid, LOHC (liquid organic hydrogen carriers)

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