| 摘要 |
PROBLEM TO BE SOLVED: To improve sulfur-resistant poisoning characteristic of the entire denitration performance. SOLUTION: After nitrogen oxide in diesel engine exhaust gas is oxidized into nitrogen dioxide at an oxidation catalyst 10 in a front stage, a hydrocarbon reducer is introduced from between the front stage and a rear stage, combined with efficient conversion of the nitrogen oxide to a nitrogen gas at a reduction catalyst 12 in the rear stage, a second component for keeping sulfur poisoning at a low level is impregnated with the oxidation catalyst 10 in the front stage, and each of manipulation temperature zones of the oxidation catalyst 10 and the reduction catalyst 12 are set to a different temperature zone in which each catalyst shows the best activation so that the oxidation catalyst 10 is higher than the reduction catalyst 12. |
