The water-gas shift reaction (WGS) is a chemical reaction in which carbon monoxide reacts with water vapor to form carbon dioxide and hydrogen:
CO(g) + H2O(v) → CO2(g) + H2(g)

Is it possible that the reaction can be carried out without the presence of catalyst?

Also at what temperature the reaction can be carried out without catalyst?

PS : I am concerned only with the conversion of CO into CO2 and not the formation of H2.