Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. At standard conditions hydrogen is a gas of diatomic molecules having the formula H2. It is colorless, odorless, tasteless,[8] non-toxic, and highly combustible. Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all normal matter.
In the era of sustainability, Hydrogen could contribute significantly. It is considered as the fuel for future. It could be used in nuclear fusion and other innovative ideas which could be a game changer in current scenario.
Realizing the role of hydrogen, it has been classified into different categories based on color. They are:
Green hydrogen
Green hydrogen is hydrogen produced by splitting water by electrolysis. This produces only hydrogen and oxygen. We can use the hydrogen and vent the oxygen to the atmosphere with no negative impact. To achieve the electrolysis we need electricity, we need power.
Blue hydrogen
Blue hydrogen is touted as a low-carbon fuel that is used for generating electricity, heating buildings, and powering cars, trains, trucks etc. It is produced by separating natural gas into hydrogen and carbon dioxide (CO2). Blue hydrogen is often touted as a low-carbon fuel for generating electricity and storing energy, powering cars, trucks and trains and heating buildings.
Grey hydrogen
Grey Hydrogen is hydrogen produced using fossil fuels such as natural gas. Unfortunately, this accounts from roughly 95% of the hydrogen produced in the world today. Most of the hydrogen produced today is gray hydrogen. It is relatively inexpensive and commonly used in the chemical industry to make fertilizer and for refining oil.
Black or brown hydrogen
Black or brown hydrogen is produced from coal. The black and brown colors refer to the type bituminous (black) and lignite (brown) coal. The gasification of coal is a method used to produce hydrogen. It’s considered the least environmentally friendly, creating as much carbon dioxide as burning the source fuel would have in the first place. For every tons of brown hydrogen produced, around 10-12 tons of CO2 are produced.
Turquoise hydrogen
Turquoise hydrogen is made using a process called methane pyrolysis to produce hydrogen and solid carbon. In the future, turquoise hydrogen may be valued as a low-emission hydrogen, dependent on the thermal process being powered with renewable energy and the carbon being permanently stored or used.
Purple hydrogen
Nuclear-produced hydrogen can also be referred to as purple hydrogen or red hydrogen. In addition, the very high temperatures from nuclear reactors could be used in other hydrogen productions by producing steam for more efficient electrolysis or fossil gas-based steam methane reforming.
Pink hydrogen
Pink hydrogen is generated through electrolysis powered by nuclear energy. Nuclear-produced hydrogen can also be referred to as purple hydrogen or red hydrogen. The Saudi royal and politician said that women are particularly pleased to see progress being made in this industry.
White hydrogen
White hydrogen is a naturally-occurring geological hydrogen found in underground deposits and created through fracking. There are no strategies to exploit this hydrogen at present.
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