the concentration of co preferential oxidation reactor s additional hydrocarbon reforming components separators adsorbers and similar equipment eventually a hydrogen rich stream 60 is delivered to the anode side of the fuel cell 10 as indicated earlier air 22 is pumped to the cathode side of the fuel cell 10 the anode and cathode exhaust streams from the fuel cell stack carry water that can be condensed out using a separator condenser as the stream exits fuel cell stack and the liquid water may be sent to reservoir 46 alternatively the water may be condensed out after the stack effluent passes through exhaust tail gas combustors fig3 illustrates a combination reaction vessel 54 for housing an endothermic and an exothermic reaction the combination reaction vessel 54 includes an endothermic reaction chamber section 62 and an exothermic reaction chamber section 64 that share a common wall or substrate 66 each endothermic reaction chamber section 62 and exothermic reaction chamber section 64 includes an associated outside wall 68 70 respectively a catalyst 61 for promoting the reformation reaction of the fuel and water is provided in the endothermic reaction chamber section 62 as illustrated in fig3 the catalyst 61 may overlie at least one of the outside wall 68 and or the substrate 66 the catalyst 61 may be provided directly on the outside wall 68 or.