Types of hydrogen, the future source of energy
The gas hydrogen has no color or smell. On the other hand, depending on its form or application or production route hydrogen might be connected to particular colors in some situations or applications. Here are some typical forms of hydrogen along with the corresponding colors. Grey Hydrogen The term "grey hydrogen" describes hydrogen that is created from fossil fuels , mostly by coal gasification or steam methane reforming (SMR) . The term "grey" refers to the environmental damage caused by carbon emissions. Blue Hydrogen Blue hydrogen is also produced from fossil fuels, but the carbon emissions generated during production are captured and stored (carbon capture and storage or CCS). The term "blue" indicates that the emissions are mitigated, distinguishing it from grey hydrogen. Blue hydrogen can be seen as an intermediate step towards decarbonizing hydrogen production. Green Hydrogen Green hydrogen is produced through electrolysis using renewable e...
