NOVELTY - A control system (10) comprises electroconductive support (12) with catalyst layer (14) on it, direct current (DC) field applicator, current control unit (28), polarization impedance measuring unit (26), polarization impedance comparator, and field application varying apparatus for varying the application of DC field to the catalyst layer and electroconductive support. The DC field applicator is across the catalyst layer and electroconductive support.    USE - For catalytic process. It is used in emediating pollution, e.g. converting gaseous pollutants to innocuous compounds, removing stocks containing methane and other light hydrocarbons. It is also used in fuel cells.    ADVANTAGE - The invention provides real time control and provides precise effects of temperature on catalyst behavior and physical structure.    DETAILED DESCRIPTION - A control system comprises electroconductive support with catalyst layer on it, direct current (DC) field applicator, current control unit, impedance measuring apparatus, polarization impedance comparator, and field application varying apparatus for varying the application of DC field to the catalyst layer and electroconductive support. The DC field applicator is across the catalyst layer and electroconductive support. The polarization impedance measuring apparatus is across the catalyst layer and electroconductive layer. The impedance measuring comparator has reference value. The application of DC field in catalyst layer and electroconductive support are varied when the measured polarization impedance differs from the reference value. The current control unit controls and varies the application of DC current to the electrodes (17, 18). An INDEPENDENT CLAIM is included for catalytic process comprising contacting catalyst of control system with throughput stream of light hydrocarbon or combustion exhaust.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of the control system.    Control system (10)    Support (12)    Catalyst layer (14)    Electrodes (17, 18)    Data transmission cables (24)    Polarization impedance measuring unit (26)    Current control unit (28)    Heating control unit (34)    Heater (36)