EXHAUST GAS TREATMENT APPARATUS FOR LEAN BURN INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To suppress H2S emission amount from a lean burn internal occlusion engine without deteriorating the treatment capability of a NOx-occlusion type catalyst. SOLUTION: In this exhaust gas treatment apparatus, nickel oxide is added in 10-35 g per 1 liter of a three-way catalyst (30b) installed as a H2S emission suppressing catalytic apparatus in the downstream side of a NOx occlusion type catalyst (30a) or a nickel oxide together with other H2S emission suppressing agent is added to the three-way catalyst (30b) in 30-300% by mole ratio to Ba added as an occluding agent to the NOx catalyst.