TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Conditions: The oxygen containing gas is air and the selected period of time is 1-2 minutes.Preferred Process: The process further comprises: embedding cooling conduits within the selective oxidizer bed; and introducing coolant through the cooling conduits.The process further comprises maintaining the selective oxidizer bed at 82 degrees C by selectively controlling the temperature and flow rate of coolant through the cooling conduits.The process may also comprise providing a fuel cell having an anode connected to the fuel processing system.In another process the selective oxidizer bed may be heated from 82-104 degrees C by selectively controlling the temperature and flow rate of coolant through the cooling conduits, this step may be carried out when the selective oxidizer bed has reached a predetermined carbon monoxide level, or after a predetermined time.The process may further comprise, initiating the process for regeneration upon an exhaust of the selective oxidizer bed reaching a predetermined carbon monoxide level.The process for regenerating a selective oxidizer bed may comprise: providing a fuel processing system; providing a first selective oxidizer bed with an inlet port and an outlet port with a normal operating temperature of 82 degrees C; providing a second selective oxidizer bed with an inlet port and an outlet port with a normal operating temperature of 82 degrees C; providing upstream fuel processor components that are connected to the inlet port of the first selective oxidizer bed and the inlet port of the second selective oxidizer bed; providing a fuel cell with an anode connected to the outlet port of the first selective oxidizer and the outlet port of the second selective oxidizer; introducing a hydrogen rich gas into the second selective oxidizer; heating the first selective oxidizer from 82 degrees C to 104degreesC while the second selective oxidizer remains at 82 degrees C thereby regenerating the first selective oxidizer; cooling the first selective oxidizer bed to 82degreesC; introducing a hydrogen rich gas into the first selective oxidizer; heating the second selective oxidizer from 82 degrees C to 104 degrees C while the first selective oxidizer remained in normal operation at 180degreesF thereby regenerating the second selective oxidizer.The carbon monoxide oxidation reactor further comprises: a temperature sensor disposed in-line between the output port of the selective oxidizer bed and the anode; a carbon dioxide sensor disposed in-line between the output port of the selective oxidizer bed and the anode; an oxygen sensor disposed in-line between the output port of the selective oxidizer bed and the anode; an output fuel flow valve disposed in-line between the output port of the selective oxidizer bed and the anode; and a microprocessor control connected to the temperature sensor, the carbon dioxide sensor and the output fuel flow valve. EXAMPLE - None given.