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control of an autothermal methanol reforming reactor which uses the copper-zinc oxide cat-alyst was studied. Temperature at 1cm below the hot-spot point in the reactor was used for the controlled variable, andthe air flow rate was used for the manipulated variable. A first order plus time delay model was identified and controlerparameters were obtained by applying the IMC-PI tuning rule to the identified model. With this controler, we couldcontrol the reforming reactor temperature within ± 5oC over 100 hours. Change of the hot-spot point due to the catalystdegradation was investigated and it could be used to design an adaptive controller.