The process of producing ‘syngas’ from coal is called “coal gasification”. $\mathrm{C}_{(s)} + \mathrm{H}_2\mathrm{O}_{(g)}$ $\xrightarrow{1270K}$ $\mathrm{CO}_{(g)} + \mathrm{H}_{2(g)}$ The production of dihydrogen can be increased by reacting carbon monoxide of syngas mixtures with steam in the presence of iron chromate as catalyst. $\mathrm{CO}_{(g)} + \mathrm{H}_2\mathrm{O}_{(g)}$ $\xrightarrow[\text{Catalyst}]{673 K}$ $\mathrm{CO}_{2(g)} + \mathrm{H}_{2(g)}$ This is called water-gas shift reaction.