NOVELTY - The module (1) has purification columns including a reversible absorber e.g. active carbon, receiving a gaseous mixture containing hydrogen from a reforming reactor (5) e.g. catalytic reactor, and providing an enriched hydrogen gas to an anodic base compartment of a fuel cell (2) e.g. proton exchange membrane type cell. The columns are supplied by the mixture and by a desorbant via respective inlets, where a thermal insulation of walls of the columns is different from sides of the inlets. A burner (17) e.g. catalytic burner, is provided in thermal contact with the reactor.    USE - Used in a motor vehicle for supplying power to an electrical equipment of the vehicle, for driving the vehicle and for autonomous extension of the vehicle, and in aeronautic field.    ADVANTAGE - The thermal insulation of the columns optimizes the operation of the columns in a rapid manner, and controls the heat exchange between the columns and an outside medium, thus controlling the temperature fluctuations of the gaseous mixture or desorbant, and controlling the temperature of the reversible absorber. The burner improves the operation of the module. The module provides thermal energy to the reforming reactor while realizing the combustion of hydrocarbon filtered by the columns, thus optimizing the performance of the reactor, and reducing a pollutant e.g. hydrocarbon, emitted from the vehicle. The absorber ensures safety in case of controlling error of the columns or when the quantity of hydrocarbon in inlet of the column is high. The thermal insulation controls the overheating of the absorber to prevent the reduction of purification capacity of the columns during an absorption phase, and increases the temperature of the absorber in an easy and rapid manner during a desorption phase. The module increases the performance of absorption and desorption of the hydrocarbon in the columns without complex controlling of temperature of fluid supplied to the columns.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method of implementing a power module.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a power module equipped of a purification device.    Power module (1)    Fuel cell (2)    Reforming reactor (5)    Burner (17)    Temperature sensor (18)