Aftertreatment device for diesel exhaust gas

A diesel engine and exhaust gas technology, which is applied in the field of diesel engine exhaust gas after-treatment devices, can solve the problems such as the decline in the ability of ammonia SCR catalyst to remove NOx, and achieve the effect of improving natural regeneration

Inactive Publication Date: 2017-04-12
HYUNDAI MOTOR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the problem with typical diesel exhaust purification systems is that due to the NOx in the exhaust entering the ammonia SCR catalyst 2 The volume fraction of the ammonia SCR catalyst is less than the volume fraction of NO, and the ability of the ammonia SCR catalyst to remove NOx decreases

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  • Aftertreatment device for diesel exhaust gas
  • Aftertreatment device for diesel exhaust gas
  • Aftertreatment device for diesel exhaust gas

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Embodiment Construction

[0022] Reference will now be made in detail to various embodiments of the invention, examples of which are illustrated in the accompanying drawings and described hereinafter. While the invention will be described in conjunction with exemplary embodiments, it will be understood that present description is not intended to limit the invention to those exemplary embodiments. On the contrary, the invention is intended to cover not only the exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, included within the spirit and scope of the invention as defined by the appended claims.

[0023] The present invention relates to an aftertreatment device for exhaust gas from a diesel engine, capable of effectively removing pollutants such as hydrocarbons and CO from exhaust gas discharged from an engine, and naturally regenerating a diesel particulate filter by burning out particulate matter in a DPF (DPF), and by increasing the NOx in the e...

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Abstract

An aftertreatment device for exhaust gas from a diesel engine, the device may include: a diesel particulate filter (DPF) located upstream of an exhaust line connected to an engine exhaust manifold; a diesel oxidation catalyst (DOC) located upstream of the diesel particulate filter downstream of the filter; and an ammonia selective catalytic reduction (SCR) catalyst downstream of the diesel oxidation catalyst, wherein the ammonia SCR catalyst is made of zeolite. The DOC has a carrier comprising a single active material of Ru or a composite active material of Pt and Ru, wherein the weight ratio of Pt to Ru is 2:1 or less. The device is capable of effectively removing pollutants such as hydrocarbons and CO from the exhaust gas, naturally regenerating the DPF by burning off particulate matter, and maximizing the amount of NO2 in the NOx in the exhaust gas entering the ammonia SCR catalyst The ability of ammonia SCR catalysts to remove NOx.

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2009-0082666 filed on September 2, 2009, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to an aftertreatment device for exhaust gas from a diesel engine, in particular, the present invention relates to an aftertreatment device for exhaust gas from a diesel engine comprising a diesel oxidation catalyst (DOC) having a single active material composed of Ru or composed of a certain weight ratio Composite active material support composed of Pt and Ru. Background technique [0004] Certain compounds in the exhaust stream of a combustion process are unfavorable because their release into the environment would result in lower air quality. Therefore, these compounds must be controlled to protect the environment and meet or exceed government emission regulations. Nitrogen oxides know...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/021F01N3/20B01D53/92B01J23/46B01J29/06
CPCB01D53/9418B01D53/944B01D53/9477B01D2251/2067B01D2255/1021B01D2255/1023B01D2255/1026B01D2255/20738B01D2255/20761B01D2255/50B01D2258/012F01N3/035F01N3/106F01N3/2066F01N2370/04F01N2610/02F01N13/009Y02A50/20Y02T10/12F01N3/00B01J23/00B01D53/58
Inventor 郑镇宇
Owner HYUNDAI MOTOR CO LTD
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