oxygen may also be provided by means of a separate oxygen supply line or air supply line which may be connected to burner tubes 18 separately or may be passed through a mixer box prior to entering line 17 where air or oxygen can be mixed with the gaseous fuel in typical operation ethylbenzene feed material is provided through inlet line 14 and passes reactor tubes 16 the interior of reactor tubes 16 may be completely or partially filled with the desirable eb dehydro catalyst that the operator wishes to utilize in the process those skilled in the art are aware of suitable dehydro catalysts which can be advantageously utilized in the present invention as previously mentioned reactor tube 16 may be completely or partially filled with the desirable eb dehydro catalyst so that eb feed from inlet header 12 flows through tube 16 across the chosen catalyst and is collected in outlet header 13 while eb flows through reactor tube 16 the gaseous mixture of fuel and oxygen source entering line 17 moves into heater nozzles 24 and exits an ignition source is provided upon startup of the reactor and the gas is continuously passed through nozzles 24 and burns as it exits the nozzles a minor amount of experimentation can determine the particular nozzle sizes to use for obtaining an ascending heat thermal reactor thus as ethylbenzene enters line 14 and passes through chamber inlet header 12 into reactor tube 16 it is passed across the.