초록 ▼

A method of cleaning an exhaust gas from a combustion system that is operated alternately in lean and rich conditions includes intermediately storing nitrogen oxides during lean operation; releasing the stored nitrogen oxides, thereby producing ammonia and storing the ammonia during rich operation;

A method of cleaning an exhaust gas from a combustion system that is operated alternately in lean and rich conditions includes intermediately storing nitrogen oxides during lean operation; releasing the stored nitrogen oxides, thereby producing ammonia and storing the ammonia during rich operation; releasing the ammonia, thereby reducing nitrogen oxides in a subsequent lean condition.

대표청구항 ▼

[ What is claimed is:] [1.] An exhaust gas cleaning system, comprising three serially connected catalysts:a first catalyst that stores nitrogen oxide in a lean combustion operation and desorbs the nitrogen oxides in a rich combustion operation;a second catalyst connected behind the first catalyst th

[ What is claimed is:] [1.] An exhaust gas cleaning system, comprising three serially connected catalysts:a first catalyst that stores nitrogen oxide in a lean combustion operation and desorbs the nitrogen oxides in a rich combustion operation;a second catalyst connected behind the first catalyst that produces ammonia in the rich combustion operation; anda third catalyst connected behind the second catalyst that stores the ammonia in the rich combustion operation and desorbs the ammonia in the lean combustion operation.