Hydrogen represents 75 % of all elements and is the most common element in the Universe. It is highly reactive and is used in a variety of industrial processes, including ammonia production for fertilizers, petroleum refining, and methanol synthesis. Hydrogen holds great promise as a clean and renewable energy source, particularly in fuel cell technology where it can be used to generate electricity. Hydrogen production has significant ecological consequences that pose additional challenges. Based on the means of production we separate hydrogen by colours: green, pink, yellow, turquoise, blue, grey, and black. Different methods are used to obtain hydrogen, such as steam reforming, gasification, pyrolysis, electrolysis, and additional processes such as water gas shift reaction and pressure swing adsorption. Hydrogen being a small molecule, has the tendency to cause embrittlement to the exposed material. Adequate ventilation and the use of appropriate material are required to prevent releases into the environment.
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