EXHAUST EMISSION CONTROL METHOD FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control method for an internal combustion engine capable of suppressing SOx poisoning phenomenon of exhaust gas purifying catalyst of NOx storage reduction type and improving a purification rate of exhaust gas further. SOLUTION: In this exhaust emission control method for the internal combustion engine, sulfur content which becomes the cause for generating sulfur oxide SOx after combustion in the internal combustion engine 1 is solidified before exhaust gas flows into the exhaust gas purifying catalyst 39 of NOx storage reduction type provided in an exhaust passage 7 using sulfur content solidifying agent (stored in a solidifying agent tank 41) containing metallic element having a function for oxidizing sulfur component and basic metallic element.