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Explain about the different industrial preparation of hydrogen

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In the large scale, hydrogen is produced currently by steam reforming of hydrocarbons. Steam and methane reacts with each other in the presence of nickel catalyst at 35 atm and at a temperature of 800°C gives hydrogen.

CH4(g) + H2O(g) → CO(g) + 3H2(g) 

Steam is passed over a red hot coke to produce carbon monoxide and hydrogen.

Water is reduced to hydrogen with carbon monoxide by passing over iron oxide catalyst at 400°C

CO(g) + H2O(g) → CO2(g) + H2(g)

Hydrogen is produced as a by-product in oil refining industry during the cracking of long chain hydrocarbons.

Hydrogen is also obtained in the manufacture of chlonne and sodium hydroxide via electrolysis of a concentrated solution of sodium chloride

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