Ncert Exercises & Solutions

Which of the following reactions increases production of dihydrogen from synthesis gas?

1. ${CH}_{4} (g) + H_{2} O (g) \to_{Ni}^{1270 K} CO (g) + 3 H_{2} (g)$

2. $C (s) + H_{2} O (g) \overset{1270 K}{\to} CO (g) + H_{2} (g)$

3. $CO (g) + H_{2} O (g) \to_{Catalyst}^{673 K} {CO}_{2} (g) + H_{2} (g)$

4. $C_{2} H_{6} + 2 H_{2} O \to_{Ni}^{1270 K} 2 CO + 5 H_{2}$

Hint: Synthesis gas is a mixture of carbon monoxide, carbon dioxide and hydrogen.

Synthesis gas is also known as syngas. It is a mixture of CO,

{CO}_{2}

and

H_{2}

The process of producing syn gas or synthesis gas from coal is called 'coal gasification'.

\underset{Coal}{C (s)} + \underset{Steam}{H_{2} O (g)} \to_{Ni}^{1270 K} \underset{Syn gas}{CO (g) + H_{2} (g)}

The production of hydrogen can be increased by reacting carbon monoxide of the syngas with steam in the presence of iron chromate as a catalyst at 673 K.

CO (g) + H_{2} O (g) \overset{{FeCrO}_{4} . 673 K}{\to} {CO}_{2} (g) + H_{2} (g)

CO₂ is removed by scrubbing with a solution of sodium arsenite.

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