NOVELTY - A plasma reactor (6) comprises exhaust gas channel which discharges exhaust gas from engine or combustion apparatus, and electrically-conductive component which has honeycomb channel (7) of polygon, ellipse or round shape arranged in multiple rows of even level, electrode embedded to honeycomb channel of odd level, ceramic honeycomb structure (10) and division structure carried out at electrically-conductive component of upstream and downstream which separately applies high voltage to upstream and downstream of honeycomb gas channel.    USE - Plasma reactor for exhaust gas purification apparatus (claimed) used for combustion apparatuses e.g. motor engines e.g. diesel engine and gasoline engine, burner, and boiler.    ADVANTAGE - The plasma reactor has simple structure and high strength, and reduces manufacturing cost.    DETAILED DESCRIPTION - A plasma reactor (6) comprises exhaust gas channel which discharges exhaust gas from engine or combustion apparatus, and electrically-conductive component which has honeycomb channel (7) of polygon, ellipse or round shape arranged in multiple rows of even level, electrode embedded to honeycomb channel of odd level, ceramic honeycomb structure (10) and division structure carried out at electrically-conductive component of upstream and downstream which separately applies high voltage to upstream and downstream of honeycomb gas channel. The nitrogen oxides and particulate matter as hazardous substances contained in exhaust gas are disappeared using plasma discharge to purify exhaust gas. Each electrically-conductive component that interposes honeycomb gas channel is electrically insulated. The exhaust gas temperature is applied to high voltage among both electrodes of electrically-conductive component at the time of low temperature. The nitrogen oxide is adsorbed in upstream or downstream of honeycomb gas channel. The oxidation combustion is carried out by active oxygen or ozone generated by plasma discharge which adsorbed particulate matter. The high voltage is succeedingly applied between other electrodes to continue adsorption of particulate matter and oxidation combustion. The nitrogen oxide in exhaust gas and nitrogen oxide discharged from wall surface of honeycomb gas channel are reduced to nitrogen by supplying nitrogen oxide reducing agent to purify exhaust gas. An INDEPENDENT CLAIM is included for an exhaust gas purification apparatus.    DESCRIPTION OF DRAWING(S) - The drawing shows a front view of the ceramic honeycomb component in exhaust gas purification apparatus.    Compact substance ceramics (1)    Porous ceramics (2)    Plasma reactor (6)    Honeycomb channel (7)    Honeycomb structure (10)