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AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKenji Sakurai, Toru Kidokoro, Yasuyuki Irisawa, Yuji Miyoshi
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In cases where at the upstream side of an NOx selective reduction catalyst there is provided another catalyst, sulfur poisoning of both the catalysts is recovered in an appropriate manner. To this end, provision is made for an NH3 generation catalyst arranged in an exhaust passage of an internal combustion engine for generating NH3, the NOx selective reduction catalyst arranged in the exhaust passage at a location downstream of the NH3 generation catalyst for reducing NOx in a selective manner, an upstream side recovery unit to recover sulfur poisoning of the NH3 generation catalyst, and a downstream side recovery unit to recover sulfur poisoning of the NOx selective reduction catalyst after the sulfur poisoning of the NH3 generation catalyst has been recovered by the upstream side recovery unit.
An exhaust gas purification apparatus, comprising:
The exhaust gas purification apparatus of claim 8, wherein the downstream side recovery unit is adapted to carry out the recovery of the sulfur poisoning by making an amount of oxygen flowing into the NOx selective reduction catalyst in a predetermined period of time after the sulfur poisoning of the NH3 generation catalyst was recovered by the upstream side recovery unit larger than an amount of oxygen flowing into the NOx selective reduction catalyst after the predetermined period of time.
An exhaust gas purification apparatus, comprising:
Dependencies are inferred from the claim text.