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How can the production of dihydrogen obtained from ‘Coal gasification’ be increased?

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The production of dihydrogen obtained from “Coal gasification” can be increased by reacting carbon monoxide of syn gas mixture with steam in the presence of iron chromate catalyst.

CO(g) + H2O(g) \(\underset{Catalyst}{\stackrel{673k}{\rightarrow}}\) CO2(g) + H2O(g)

This reaction is called water gas shift reaction. CO2 is removed by scrubbing with sodium arsenite solution.

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