Abstract: There is a control system for a catalytic process. The control system has the following: a) an electroconductive support having a layer of a catalyst thereon; b) a means for applying DC current of one polarity to the catalyst layer and the opposite polarity to the electroconductive support; c) a means for controlling and varying the application of DC current; d) a means for measuring the polarization impedance across the catalyst layer and the electroconductive support; e) a means for comparing the measured polarization impedance with a reference value; and f) a means for varying the application of DC current to the catalyst layer and the electroconductive support when the measured polarization impedance differs from the reference value.