Method for preparing water-gas shift catalysts, catalysts, and method for reducing carbon monoxide content

The present invention relates to HTS catalysts used in hydrogen or synthesis gas production units, whether in steam reforming, autothermal reforming, dry reforming or gasification processes, that are chromium-free and comprise iron oxide, containing levels of platinum between 0.1 and 0.4% m/m, promoted by sodium levels of between 0.1 and 0.3% m/m, and optionally aluminium levels of between 5.0 and 6.0% m/m inserted into the crystal lattice of an iron oxide having a hematite crystal structure (Fe2O3), thereby combining high activity with excellent resistance to deactivation by exposure to high temperatures. In a second aspect, the present invention provides a method for converting carbon monoxide by bringing said catalyst into contact with a stream of synthesis gas, in which the maximum temperature of the bed can be limited by injecting water or steam together with the CO-containing gas feed at the inlet of the reactor.