Hydrogen is also used as a raw material in some industries, and it is seen that hydrogen production will play an important role in implementing the hydrogen energy economy in the future. It is expected to contribute to the future in terms of energy and clean environment by developing advanced technologies together with electrolysis, thermochemical, electrochemical, photobiological and photochemical methods to produce hydrogen. In addition, in some cases, hydrogen-rich gases are produced instead of pure hydrogen by processes such as membrane separation, pressure swing adsorption and cryogenic distillation, such as hydrogen separation and purification.