Patent ID: 9057298
Filing Date: 2015-06-16
Classification: B01D,F01N

Abstract:
1. An exhaust purification system for an internal combustion engine in which fuel is burned under an oxygen excess, comprising: a wall flow particulate filter configured to trap particulate matter in exhaust gas; and an ash atomizer configured to temporarily perform ash atomization processing; wherein: the particulate filter is configured to be arranged inside of an exhaust passage and is configured to trap ash along with the particulate matter; the particulate filter comprises a solid acid having a Hammett acidity function smaller than −0.83 and larger than −12 at standard ambient temperature and pressure of 25° C. and 1 atmosphere; and the ash atomizer is configured to temporarily perform the ash atomization processing by temporarily decreasing a concentration of oxygen in the exhaust gas that flows into the particulate filter and increasing a temperature of the particulate filter to remove ash from the particulate filter.