NOVELTY - The reformer system in motor vehicles, comprises reformer (14) for reacting hydrocarbon-containing fuel to hydrogen-rich reformate gas (18), hydrocarbon (HC) adsorber (20), consumer having exhaust gas-after treatment system (26), combustion engine (28) and fuel cell. The HC adsorber is mounted on downstream of the reformer. The hydrocarbon-containing fuel is gasoline, diesel and/or alcohols. The HC adsorber exhibits activated charcoal and/or a material with a porous structure functioning as zeolite.    USE - Useful in motor vehicles.    ADVANTAGE - The reformer system increases the quantity and quality of the hydrogen enriched reformate gas, which does not produces the unwanted pollutants.    DETAILED DESCRIPTION - The reformer system in motor vehicles, comprises reformer (14) for reacting hydrocarbon-containing fuel to hydrogen-rich reformate gas (18), hydrocarbon (HC) adsorber (20), consumer having exhaust gas-after treatment system (26), combustion engine (28) and fuel cell. The HC adsorber is mounted on downstream of the reformer. The hydrocarbon-containing fuel is gasoline, diesel and/or alcohols. The HC adsorber exhibits activated charcoal and/or a material with a porous structure functioning as zeolite. The reformer system is adapted to forward the reformate gas (18) to a consumer once it passes the HC adsorber (20). The adjustment of the adsorption/desorption behavior of the HC-adsorber that depends upon the reformate gas temperature takes place through material of the HC-adsorber and/or through positioning of the HC-adsorber. During an operating phase of the reformer, the temporal progression of the adsorption/desorption behavior of the HC adsorber is adapted to the temporal progression of the operating behavior of the consumer. The desorption of hydrocarbons from the HC adsorber takes place when the consumer is in an operating state in which the desorbed hydrocarbons are processed by the consumer, which is not substantially affect the hydrocarbon content of the gases emitted by the consumer and/or the function of the consumer. The function of the adsorber is coordinated on the reformate gas temperature by an inversion temperature of the reformate gas in such a manner that the adsorption of the hydrocarbon is balanced out of the reformate gas by the desorption of the adsorbed hydrocarbons at the reformate gas. The reformer gas contains a constant equilibrium temperature in the operation of the reformer in which the temperature balance is adjusted itself after the initial phase of the reformation process. The inversion temperature of the HC adsorber is smaller than the equilibrium temperature of the reformer gas and/or the adsorption capacity of the HC-adsorber for reformate gas contained hydrocarbon species exhibits low temperature relative to equilibrium temperature of maximum 100degreesC. The HC-adsorber is adapted to desorb previously adsorbed hydrocarbons to the reformate gas with a rate slightly relative to the desorption rate at above or below the vacuum temperature. The HC-absorber is connected before a heat exchanger and is containing hydrocarbon-adsorbing material at the walls of the heat exchanger. The temperature of the reformate gas is reduced through downstream heat exchanger of the reformer. The heat exchanger is designed for adjusting optimal temperature of the reformate gas for the adsorption and/or desorption of the hydrocarbon through HC adsorber. A part of the reformate gas, from the reformate gas flow before its enter into the HC adsorber between an entry and exit of the reformer, is removed before and/or after the heat exchanger by removing unit.    INDEPENDENT CLAIMS are included for:    (1) vehicle with a reformer system; and    (2) a reforming method for converting hydrocarbon-containing fuel to a hydrogen-rich reformate gas.    DESCRIPTION OF DRAWING(S) - The drawing shows a reformer system:    Reformer; (14)    Reformate gas; (18)    Hydrocarbon adsorber; (20)    Exhaust gas-after treatment system; (26)    Combustion engine. (28)