Patent ID: 8281577

Claim:
An exhaust gas purification system, comprising: a reduction catalyst for reducing and removing nitrogen oxides in an exhaust gas from an internal combustion engine by bringing the nitrogen oxides into contact with a reducing agent; an oxidation catalyst for oxidizing gas components in the exhaust gas; water electrolysis means for electrolyzing water to produce hydrogen and oxygen; hydrogen supply means for supplying the hydrogen produced by the water electrolysis means to an upstream side in an exhaust gas flow-through direction of the reduction catalyst; oxygen supply means for supplying the oxygen produced by the water electrolysis means to the exhaust gas; particulate matter removing means for trapping, burning and removing particulate matter contained in the exhaust gas, wherein the oxygen supply means has second oxygen supply means for supplying the oxygen to an upstream side in the exhaust gas flow-through direction of the particulate matter removing means; ozone producing means for producing ozone from the oxygen obtained by the water electrolysis means; and ozone supply means for supplying the ozone obtained by the ozone producing means to the upstream side in the exhaust gas flow-through direction of, at least, the oxidation catalyst among the oxidation catalyst and the particulate matter removing means.