is especially methanol for supplying a gas generation system belonging to a fuel cell installation the waste gas from the fuel cell and or gas generation system is catalytically combusted together with a gas containing oxygen in order to produce the thermal energy required therefore the combustible is added in a dosed manner to the volume flow from the gas containing oxygen and the waste gases of the fuel cell and or gas generator system in the direction of flow prior to catalytic combustion application_number US 18116002 A description the only attached figure shows such a heat exchanger 1 which is joined up by a schematically indicated gas generation system 2 and a fuel cell 3 in this context heat exchanger 1 features two regions 1 a 1 b which are in heat conductive contact with each other but sealed from each other for the fluids which flow therethrough respectively in this context region 1 b of heat exchanger 1 has a schematically indicated catalytic coating 4 a catalytic filling or the like which is required for a catalytic combustion of the supplied substances the energy which develops during the catalytic combustion in region 1 b of heat exchanger 1 then reaches the other region 1 a of heat exchanger 1 a liquid fuel or a liquid fuel water mixture which in the exemplary embodiment shown is assumed to be a methanol water mixture ch 3 oh h 2 o and which is fed to region 1 a is vaporized in region.