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1. WO2011142028 - EXHAUST GAS PURIFICATION SYSTEM FOR INTERNAL COMBUSTION ENGINE

Publication Number WO/2011/142028
Publication Date 17.11.2011
International Application No. PCT/JP2010/058193
International Filing Date 14.05.2010
IPC
F01N 3/08 2006.1
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
3Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
08for rendering innocuous
B01D 53/94 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
53Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases or aerosols
34Chemical or biological purification of waste gases
92of engine exhaust gases
94by catalytic processes
CPC
B01D 2251/2067
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2251Reactants
20Reductants
206Ammonium compounds
2067Urea
B01D 2255/30
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2255Catalysts
30Silica
B01D 2255/50
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2255Catalysts
50Zeolites
B01D 2255/911
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
2255Catalysts
90Physical characteristics of catalysts
911NH3-storage component incorporated in the catalyst
B01D 53/90
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
53Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols,
34Chemical or biological purification of waste gases
74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
86Catalytic processes
90Injecting reactants
B01D 53/9431
BPERFORMING OPERATIONS; TRANSPORTING
01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
DSEPARATION
53Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols,
34Chemical or biological purification of waste gases
92of engine exhaust gases
94by catalytic processes
9404Removing only nitrogen compounds
9409Nitrogen oxides
9431Processes characterised by a specific device
Applicants
  • トヨタ自動車株式会社 TOYOTA JIDOSHA KABUSHIKI KAISHA [JP]/[JP] (AllExceptUS)
  • 福田 光一朗 FUKUDA, Koichiro [JP]/[JP] (UsOnly)
  • 広田 信也 HIROTA, Shinya [JP]/[JP] (UsOnly)
  • 利岡 俊祐 TOSHIOKA, Shunsuke [JP]/[JP] (UsOnly)
  • 星 作太郎 HOSHI, Sakutaro [JP]/[JP] (UsOnly)
Inventors
  • 福田 光一朗 FUKUDA, Koichiro
  • 広田 信也 HIROTA, Shinya
  • 利岡 俊祐 TOSHIOKA, Shunsuke
  • 星 作太郎 HOSHI, Sakutaro
Agents
  • 川口 嘉之 KAWAGUCHI, Yoshiyuki
Priority Data
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) EXHAUST GAS PURIFICATION SYSTEM FOR INTERNAL COMBUSTION ENGINE
(FR) SYSTÈME DE PURIFICATION DES GAZ D'ÉCHAPPEMENT POUR MOTEUR À COMBUSTION INTERNE
(JA) 内燃機関の排気浄化装置
Abstract
(EN) Disclosed is a technique for preventing the leakage of NH3 to the downstream of a selective reduction type NOx catalyst and adding a reducing agent continuously as possible to prevent the reduction in the NOx purification rate in an exhaust gas purification system for an internal combustion engine. The selective reduction type NOx catalyst has an activation point at which NOx can be purified with NH3 and an adsorption site on which NH3 can be adsorbed, wherein the adsorption site has a proximal site that is located in the vicinity of the activation point and a distal site that is located distally to the activation point, the proximal site can transfer NH3 to the activation point more readily than the distal site, the desorption rate of NH3 in the proximal site is higher than that in the distal site, and the addition of the reducing agent from a reducing agent addition unit can be controlled so that NH3 adsorbed on the proximal site can remain to exist on the proximal site based on the desorption rate of NH3 in the proximal site.
(FR) L'invention concerne une technique permettant d'empêcher la fuite de NH3 en aval d'un catalyseur de NOx du type à réduction sélective et d'ajouter un agent réducteur aussi continuellement que possible afin d'empêcher la réduction du taux de purification de Nox dans un système de purification des gaz d'échappement pour un moteur à combustion interne. Le catalyseur de Nox du type à réduction sélective comprend un point d'activation au niveau duquel le Nox peut être purifié avec le NH3 et un site d'adsorption sur lequel le NH3 peut être adsorbé, le site d'adsorption comprenant un site proximal qui est situé au voisinage du point d'activation et un site distal qui est situé de façon distale par rapport au point d'activation, le site proximal pouvant transférer le NH3 vers le point d'activation plus facilement que le site distal, le taux de désorption de NH3 dans le site proximal étant supérieur à celui dans le site distal, et l'ajout de l'agent réducteur provenant d'une unité d'ajout d'agent réducteur pouvant être commandé de sorte que le NH3 adsorbé sur le site proximal puisse rester afin d'exister sur le site proximal sur la base du taux de désorption de NH3 dans le site proximal.
(JA)  本発明は、内燃機関の排気浄化装置において、選択還元型NOx触媒の下流へのNHのすり抜けを回避しつつ、還元剤を可及的に継続して添加し、NOx浄化率の低下を回避する技術を提供することを目的とする。本発明では、選択還元型NOx触媒は、NHを用いてNOxを浄化する活性点と、NHを吸着する吸着サイトと、を有しており、吸着サイトには、活性点の近傍に位置する近傍サイトと、活性点の遠方に位置する遠方サイトと、が存在し、近傍サイトは遠方サイトよりも活性点にNHを受け渡し易く、近傍サイトのNHの離脱速度が遠方サイトのNHの離脱速度よりも速いものであり、近傍サイトのNHの離脱速度に基づいて、近傍サイトに吸着したNHを存在させ続けるように還元剤添加部からの還元剤の添加を制御する。
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