The present invention provides methods and systems for controlling a catalytic process. The control system includes: an electroconductive support having a layer of a catalyst thereon; a first electrode in contact with said electroconductive support; a second electrode in contact with said catalyst layer; a current control unit for applying a current to said first and second electrodes and for controlling and varying the amount of current applied; an impedance measurement unit for continuously, monitoring and measuring the polarization impedance across an interface between the catalyst layer and the electroconductive support; a processing-unit for comparing the measured polarization impedance with a reference value. The amount of current applied to the catalyst layer and the electroconductive support via the first and second electrodes is varied to change the polarization impedance when the measured polarization impedance differs from the reference value.