| 摘要 |
An exhaust gas purification system which uses an NOX purification apparatus (4), which can reduce the amount of use of precious metal and exhibit an NOX purification performance at a low temperature and/or in an oxidizing atmosphere, and can have an NOX purification performance even by an exhaust gas composition including HC and NOX at the time of a non-steady operation etc., that is, an exhaust gas purification system using an. NOX purification apparatus (4), provided with an NOX purification catalyst provided, in an exhaust gas passage (3) and comprised of a carrier on which are carried nanoparticles including gold atoms and nickel atoms in a state of close proximity and a means for predicting the amount of exhaust of NOX, which, when it is predicted that NOX will be exhausted, operates means (2,9) for increasing carbon monoxide in exhaust gas fed to the NOX, purification catalyst (4) and, when it is predicted that NOX will not be exhausted, purifies exhaust gas exhausted from an engine by the NOX purification catalyst (4) without injection of excess fuel. |
