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How can production of hydrogen from water gas be increased by using water gas shift reaction ? |
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Answer» Solution :Water gas is produced wh superheated eam is passed over red hot coke or coal at 1270 K in presence of nickel as catalyst `underset"Coke"(C_(s)) + underset"STEAM"(H_2O_((g))) + 121.3kJ underset"[Ni]"overset"1270 k"to ubrace(CO_((g)) + H_(2(g)))_("water gas")` It is difficult to obtain pure `H_2` from water gas as CO is difficult to remove. Therefore, to increase the production of `H_2` from water gas, CO is oxidised to `CO_2` by mixing it with more steam and passing the mixture over `FeCrO_4` catalyst at 673 K. `ubrace(CO_((g)) + H_(2(g)))_("water gas") +underset"steam"(H_2O_((g))) underset(FeCrO_4)overset"673k"toCO_(2(g)) + 2H_(2(g))` The chemical reaction in which CO of water gas reacts with steam to form `CO_2` and more `H_2` is called water gas shift reaction. (WGSIQ). `CO_2` from syngas this produced can be removed either by scrubbing the mixture with sodium arsenite solution or by passing the mixture through water under 30 atm pressure when `CO_2` dissolves leaving behind `H_2` which is collected. |
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