FUEL CELL SYSTEM

The fuel cell system has a reformer (5), a solid oxide fuel cell stack (1), a catalytic converter (18) and cathode air pre-heater (12). The cathode air pre-heater is provided in front of the exhaust catalyst converter in the flow direction of the exhaust gas. A mixing chamber (10) for anode-off gas and cathode exhaust is arranged behind the reaction chamber (11). The bonding layer between the catalyst material and the catalyst carrier is a hexa-aluminate, which is applied by sol-gel method.