(JP9063620-A)      A fuel cell system comprises a number of stacked cells (32), each with an anode (40), a cathode (42) and a rigid-body polymeric electrolyte membrane (38), which is sandwiched between the anode and cathode. Fuel gas is supplied to the anode via one channel (20) and oxygen-containing gas is supplied to the cathode via a second channel (46). This second channel has a catalytic converter (50) in its path to oxidise selectively carbon monoxide contained in the incoming air. The converter has an electric heater (56) and also receives heat from a burner. The gas inlet system includes a compressor (52) and an intercooler (54) following the converter, the intercooler supplying the cathode directly.    ADVANTAGE -   simple design using air free from carbon monoxide as an oxidiser.    (GB2304976-B)      The fuel cell system comprises a number of stacked cells (32), each with an anode (40), a cathode (42) and a rigid-body polymeric electrolyte membrane (38), which is sandwiched between the anode and cathode. Fuel gas is supplied to the anode via one channel (20) and oxygen-containing gas is supplied to the cathode via a second channel (46). This second channel has a catalytic converter (50) in its path to oxidise selectively carbon monoxide contained in the incoming air.    The converter has an electric heater (56) and also receives heat from a burner. The gas inlet system includes a compressor (52) and an intercooler (54) following the converter, the intercooler supplying the cathode directly.    ADVANTAGE -   Simple design using air free from carbon monoxide as an oxidiser.    (US5837393-A)      The fuel cell system comprises a number of stacked cells (32), each with an anode (40), a cathode (42) and a rigid-body polymeric electrolyte membrane (38), which is sandwiched between the anode and cathode. Fuel gas is supplied to the anode via one channel (20) and oxygen-containing gas is supplied to the cathode via a second channel (46). This second channel has a catalytic converter (50) in its path to oxidise selectively carbon monoxide contained in the incoming air.    The converter has an electric heater (56) and also receives heat from a burner. The gas inlet system includes a compressor (52) and an intercooler (54) following the converter, the intercooler supplying the cathode directly.    ADVANTAGE -   Simple design using air free from carbon monoxide as an oxidiser.    (DE19635008-C2)      The fuel cell system comprises a number of stacked cells (32), each with an anode (40), a cathode (42) and a rigid-body polymeric electrolyte membrane (38), which is sandwiched between the anode and cathode. Fuel gas is supplied to the anode via one channel (20) and oxygen-containing gas is supplied to the cathode via a second channel (46). This second channel has a catalytic converter (50) in its path to oxidise selectively carbon monoxide contained in the incoming air.    The converter has an electric heater (56) and also receives heat from a burner. The gas inlet system includes a compressor (52) and an intercooler (54) following the converter, the intercooler supplying the cathode directly.    ADVANTAGE -   Simple design using air free from carbon monoxide as an oxidiser.