Explain briefly how hydrogen is manufactured on a large scale, from steam.

Question

KnowledgeBoat · Accepted Answer

Step I Reaction : Production of water gas Reactants : White hot coke and steam Temperature : Around 1000°C Process : Passage of steam over white hot coke [carbon] Chamber : Specially designed convertor Step II Reaction : Reduction of steam to hydrogen by carbon monoxide Reactants : Water gas and excess steam Temperature : Around 450°C Catalysts : Iron [III] oxide [Fe₂O₃], promoter chromic oxide [Cr₂O₃] Process : Excess steam is mixed with water gas, passed over a catalyst at elevated temperatures. [CO is converted to CO₂ with a further yield of hydrogen.] Step III Reaction : Separation of carbon dioxide [CO₂] and carbon monoxide from the above mixture (a) CO₂ is removed by dissolving mixture in water under pressure [30 atmospheres], or caustic potash solution to dissolve CO₂. 2KOH + CO₂ K₂CO₃ + H₂O (b) CO is removed by dissolving mixture in ammoniacal cuprous chloride solution. CuCl + CO + 2H₂O CuCl.CO.2H₂O. Thus, hydrogen gas is left over.

Chemistry

Explain briefly how hydrogen is manufactured on a large scale, from steam.

Hydrogen

Related Questions

Describe one chemical test applied to the following gases, which would enable you to distinguish between them : 'carbon monoxide and hydrogen'.

Write down the 'word equation' for the following reaction : sodium hydroxide solution + zinc ⟶

State the products of the reaction 'when steam is passed over red-hot iron'.

How can you obtain hydrogen from a mixture of hydrogen and carbon monoxide.