| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust gas cleaning apparatus long in life capable of preventing the catalyst poisoning caused by the accumulation of fine particles such as soot or the like or sulfur oxide in the nitrogen oxide removing catalyst used in a nitrogen oxide removing device. SOLUTION: A fine particulate substance removing device 10 and a sulfur oxide removing device 20 are provided to exhaust gas passages 2a-2d in series on an upstream side and the nitrogen oxide removing device 30 is provided on a downstream side. The nitrogen oxide removing device 30 is provided with the nitrogen oxide removing catalyst 32 wherein noble metal particles 32b containing at least one kind of an element among Ru, Rh, Pd, Ir, Pt and Au are dispersed and arranged on the surface of a perovskite type composite oxide 32a represented by the general formula: BO3 (wherein two kinds of elements are constituent elements A and B). |
