METHOD OF PURIFYING EXHAUST GAS FROM INTERNAL COMBUSTION ENGINE

摘要

A method in which the range of temperatures at which a high-concentration hydrocarbon can be burned is widened or a high-temperature gas is rapidly supplied to a later-stage catalyst. The method for purifying an exhaust gas discharged from an internal combustion engine comprises using a catalyst for increasing the temperature of the exhaust gas to purify the exhaust gas, and is characterized in that a hydrocarbon is introduced in an amount of 1,000-40,000 vol.ppm, in terms of methane amount, of the exhaust gas into an exhaust-gas passageway of the internal combustion engine on the upstream side of the temperature increase catalyst in the flow of the exhaust gas.