Methods of Preparation of Hydrogen

Hydrogen is the most prevalent element present in the universe, and hydrogen makes up most of the Sun and other stars. According to studies, hydrogen atoms make up 90% of the universe’s particles. Compared to any other element, hydrogen is the component with the most compounds, and water is also the most prevalent hydrogen compound. Sugar, petroleum, minerals, lipids, cellulose and starch, acids, alcohols, oils, and thousands of other compounds contain hydrogen.

At typical temperatures, hydrogen is a colourless, tasteless, odourless, and nonpoisonous gas comprising a diatomic molecule H2. Because hydrogen readily makes covalent compounds with many nonmetallic elements, most Hydrogen on Earth is found in molecular forms such as water or organic molecules.

Preparation of Hydrogen 

Breaking chemical bonds is required to produce elemental hydrogen from molecules. The following are the most popular hydrogen preparation methods:-

• Laboratory method
• Commercial method
• Industrial Method

So, let us discuss the following methods in brief.

Preparation of Hydrogen in Laboratory

Hydrogen is easily made in the laboratory by reaction of metals like zinc, iron, and tin with dilute acid preferably HCl.

It can also be prepared by reaction of amphoteric metals with aqueous alkali

Zn + 2NaOH → Na2ZnO2 + H2

Preparation of Hydrogen by the commercial method 

The mixture of carbon monoxide and water is commonly referred to as water gas. This water gas is also known as ‘syngas’ or synthesis gas since it is employed to produce methanol and other hydrocarbons. Scrap wood, sawdust, and other items make this synthesis gas. Generating syngas from coal is known as ‘coal gasification.’ The formation of hydrogen gas can be increased by reacting synthesis gas carbon monoxide with a stream in the form of iron chromate as a catalyst at temperatures up to 673K.

The reaction of coal gasification is:

C(s)+ H2O(g)  →  2 CO(g)+ H2 (g)

The water gas shift reaction for increasing yield.

CO(g)+H2O(g)→CO2(g)+H2O(g)

The carbon dioxide is removed by scrubbing with sodium arsenite.

Preparation of Hydrogen by the industrial method 

Hydrogen is created on a big scale by steam-reforming hydrocarbons. In this process, a hydrocarbon like methane is combined with steam & passed through a nickel catalyst at temperatures ranging from 800 to 900 degrees Celsius and 35 atmospheres.

CH4+ H2O → CO + 3H2

High purity H2 can be obtained by electrolysis of aqueous barium hydroxide with nickel electrodes.

What are the different uses of hydrogen?

• Hydrogen is utilised to make ammonia, then used to make nitric acid and nitrogen-based fertilisers.
• The hydrogenation of the vegetable oils such as cottonseeds, soya beans, and others produces dihydrogen, which is utilised to produce vanaspati fat.
• It’s used to make a lot of organic compounds, including methanol. In the existence of a cobalt catalyst, CO (g) reacts with 2H2 (g) to produce methanol.
• It is primarily utilised in the production of metal hydrides.
• Hydrogen is necessary to produce hydrogen chloride, a precious chemical.
• It is used to convert substantial metal oxides to metals in metallurgical processes.
• Welding and cutting are done with atomic hydrogen and oxyhydrogen torches. The breakdown of hydrogen to use an electric arc allowed to rest on the surface to be welded produces atomic hydrogen atoms at a high temperature of 4000K.
• It is used as rocket fuel in space research.
• Hydrogen is utilised in fuel cells to create electricity. This energy provides several advantages over traditional fossil fuels and other energy sources. It does not pollute the air by releasing dangerous elements into the environment. Compared to gasoline and other fuels, it produces more energy per unit fuel mass.

What is the Structure of Hydrogen?

Hydrogen has one positively charged proton with one negatively charged electron and one, two, or three neutrons in its nucleus. Isotopes are distinct versions of the same substance with varying neutron counts. The mass of the hydrogen atom is affected by the no. of neutrons in the nucleus. Hydrogen isotopes are not to be confused with hydrogen allotropes.

Different versions with the same element are known as allotropes. Allotropes are different from isotopes in that they are the various ways that atoms of the same type join together. The molecular morphologies of allotropes and, as a result, the features of molecules are influenced by the number of atoms binding and the order of those bonds. The molecular form of hydrogen presents in 2 isomeric forms.

Conclusion

We have discussed the different methods, i.e. Laboratory method, Commercial method, Industrial method, of the Hydrogen formations. Hydrogen is one of the most crucial elements of the Earth and universe. The structure of hydrogen consists of one positively charged proton with one negatively charged electron and one, two, or three neutrons in its nucleus.