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(11) | EP 2 570 625 A8 |
| (12) | CORRECTED EUROPEAN PATENT APPLICATION |
| published in accordance with Art. 153(4) EPC |
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| (54) | EXHAUST GAS PURIFICATION SYSTEM FOR INTERNAL COMBUSTION ENGINE |
| (57) An object of the present invention is to increase the flexibility in the layout of
an exhaust gas purification system for an internal combustion engine including selective
catalytic reduction catalyst provided in an exhaust passage of the internal combustion
engine and an addition device for supplying reducing agent derived from ammonia to
the selective catalytic reduction catalyst, without a deterioration of the performance
in reducing nitrogen oxides. To achieve the object, the exhaust gas purification system
for an internal combustion engine according to the present invention is configured
to supply hydrocarbon at the same time when reducing agent derived from ammonia is
supplied to the selective catalytic reduction catalyst, thereby producing reducing
agent that is hard to be oxidized by a precious metal catalyst.
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