How can the production of dihydrogen, obtained from 'Coal gasification', be increased?

Explanation

The process of producting syngas or synthesis gas from coal is called 'coal gasification'.
` underset("Coal")(C(s))+ underset("Steam")(H_(2)O(g)) underset(Ni)overset(1270K)to underset("Syngas")ubrace(Co(g)+H_(2)(g))`
The production of hydrogen can be increased by reacting carbon monoxide of syngas with steam in presence of iron chromate as catalyst at 673 K . This is called water gas shift reaction.
`CO(g) + H_(2)O(g) overset(FeCrO_(4),673K)to Co_(2)(g) + H_(2)(g)`
The `CO_(2)` thus produced is removed either by scrubbing with a solution of sodium aresente or by passing the mixture through water under 30 atm . Pressure when `CO_(2)` dissolves leaving behind `H_(2)` which is collected.