JP6604323B2 - 内燃機関の排ガス浄化システム及び排ガス浄化用触媒の使用方法 - Google Patents
内燃機関の排ガス浄化システム及び排ガス浄化用触媒の使用方法 Download PDFInfo
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- 238000000746 purification Methods 0.000 title claims description 42
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- 238000012545 processing Methods 0.000 claims description 21
- 229910052763 palladium Inorganic materials 0.000 claims description 7
- 229910052703 rhodium Inorganic materials 0.000 claims description 7
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- 230000003647 oxidation Effects 0.000 description 50
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- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 32
- 239000000843 powder Substances 0.000 description 26
- 230000010718 Oxidation Activity Effects 0.000 description 24
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 16
- 239000001294 propane Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 15
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
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- 230000008859 change Effects 0.000 description 5
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- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 229910002651 NO3 Inorganic materials 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
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- NEAPKZHDYMQZCB-UHFFFAOYSA-N N-[2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]ethyl]-2-oxo-3H-1,3-benzoxazole-6-carboxamide Chemical compound C1CN(CCN1CCNC(=O)C2=CC3=C(C=C2)NC(=O)O3)C4=CN=C(N=C4)NC5CC6=CC=CC=C6C5 NEAPKZHDYMQZCB-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
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- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
- B01D53/945—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific catalyst
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- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to the engine
- F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/101—Three-way catalysts
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- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
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- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
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- F02D41/02—Circuit arrangements for generating control signals
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- F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F01N2560/02—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor
- F01N2560/025—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being an exhaust gas sensor for measuring or detecting O2, e.g. lambda sensors
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Description
図1は、内燃機関の排ガス浄化システムの概念図である。
本実施の形態における内燃機関の排ガス浄化システム1は、自動車に搭載されており、内燃機関であるエンジン2から排出される排ガスを浄化するものである。排ガス浄化システム1は、エンジン2と、排ガス浄化用触媒3と、入ガス温センサ4と、A/Fセンサ5と、ECU6を有している。
[実施例1]
300ccの蒸留水に9.85gのCeO2粉末を分散し、撹拌しながらPt量で0.3g分のジニトロジアンミンPt硝酸溶液を混合した。続けて撹拌しながら加熱し、水分がなくなるまで蒸発させ、得られた粉末を500℃で2時間、電気炉で焼成した。この粉末に9.85gのAl2O3粉末を乳鉢で混合し、Pt濃度が1.5wt.%となるPt/CeO2+Al2O3の粉末を得た。この粉末を圧縮成型し、0.5〜1.7mmのペレット触媒を調製した。
実施例1の触媒を用いて600℃で酸化処理を行い、その後の降温過程で還元処理を行わず、100℃以下になってから実施例1と同様の評価を行った。
実施例1の触媒を用い、600℃で酸化処理した後に降温する過程の100℃(下限温度T1)で20秒間の還元処理を行ってから実施例1と同様の評価を行った。
実施例1の触媒を用い、600℃で酸化処理した後に降温する過程の400℃(上限温度T2)で20秒間の還元処理を行い、100℃以下になってから実施例1と同様の評価を行った。
[実施例2]
300ccの蒸留水に19.7gのCeO2粉末を分散し、撹拌しながらPt量で0.3g分のジニトロジアンミンPt硝酸溶液を混合した。続けて撹拌しながら加熱し、水分がなくなるまで蒸発させ、得られた粉末を500℃で2時間、電気炉で焼成した。Pt濃度が1.5wt.%となるPt/CeO2の粉末を得た。この粉末を圧縮成型し、0.5〜1.7mmのペレット触媒を調製した。
実施例1の触媒を用いて600℃で酸化処理を行い、300℃降温後に還元処理を行わず酸化活性を評価した。その他に、それぞれ5、10、20、60秒の還元処理を行った場合の活性も実施した。図7及び表4には、すべての実験結果を載せてある。
[実施例3]
300ccの蒸留水に19.7gのCeO2粉末を分散し、撹拌しながらPd量で0.3g分の硝酸Pd溶液を混合した。続けて撹拌しながら加熱し、水分がなくなるまで蒸発させ、得られた粉末を500℃で2時間、電気炉で焼成した。そして、Pd濃度が1.5wt.%となるPd/CeO2の粉末を得た。この粉末を圧縮成型し、0.5〜1.7mmのペレット触媒を調製した。
300ccの蒸留水に19.7gのCeO2粉末を分散し、撹拌しながらRh量で0.3g分の硝酸Rh溶液を混合した。続けて撹拌しながら加熱し、水分がなくなるまで蒸発させ、得られた粉末を500℃で2時間、電気炉で焼成し、Rh濃度が1.5wt.%となるRh/CeO2の粉末を得た。この粉末を圧縮成型し、0.5〜1.7mmのペレット触媒を調製した。
実施例2の触媒を用いて600℃で酸化処理した後に300℃まで降温し、20秒間の還元処理を行った後の酸化活性を評価した。
300ccの蒸留水に19.4gのCeO2粉末を分散し、撹拌しながらPt量で0.6g分の硝酸Pt溶液を混合した。続けて撹拌しながら加熱し、水分がなくなるまで蒸発させ、得られた粉末を500℃で2時間、電気炉で焼成し、Pt濃度が3.0wt.%となるPt/CeO2の粉末を得た。この粉末を圧縮成型し、0.5〜1.7mmのペレット触媒を調製した。
300ccの蒸留水に19.0gのCeO2粉末を分散し、撹拌しながらRh量で1.0g分の硝酸Pt溶液を混合した。続けて撹拌しながら加熱し、水分がなくなるまで蒸発させ、得られた粉末を500℃2時間電気炉で焼成し、Pt濃度が5.0wt.%となるPt/CeO2の粉末を得た。この粉末を圧縮成型し、0.5〜1.7mmのペレット触媒を調製した。
実施例3の触媒を用いて600℃で酸化処理を行い、300℃に降温した後に還元処理を行わず酸化活性を評価した。
実施例4の触媒を用いて600℃で酸化処理を行い、300℃に降温した後に還元処理を行わず酸化活性を評価した。
実施例2の触媒を用いて600℃で酸化処理を行い、300℃に降温した後に還元処理を行わず酸化活性を評価した。
実施例6の触媒を用いて600℃で酸化処理を行い、300℃に降温した後に還元処理を行わず酸化活性を評価した。
実施例7の触媒を用いて600℃で酸化処理を行い、300℃に降温した後に還元処理を行わず酸化活性を評価した。
2 エンジン(内燃機関)
3 排ガス浄化用触媒
4 入ガス温センサ
5 A/Fセンサ
6 ECU
7 排気管
Claims (2)
- CeO2を含む担体に、RhとPdとPtの少なくとも一つが坦持された構成を有する排ガス浄化用触媒を用いた内燃機関の排ガス浄化システムであって、
前記排ガス浄化用触媒に流入する排ガスの温度である入ガス温が基準温度よりも高温の状態となった場合に還元処理必要フラグをONに設定するフラグON設定手段と、
該フラグON設定手段により前記還元処理必要フラグがONに設定されており、かつ、前記入ガス温が低下して前記基準温度以下の温度範囲である100℃以上400℃以下の温度範囲に入っていること、という還元処理実行条件が成立しているか否かを判断する条件成立判断手段と、
該条件成立判断手段により前記還元処理実行条件が成立していると判断された場合に、前記内燃機関に供給される吸気の空燃比を理論空燃比よりもリッチ側に調整する還元処理を実行する還元処理実行手段と、
該還元処理実行手段により前記還元処理が実行された場合に前記還元処理必要フラグをOFFに設定するフラグOFF設定手段と、
を有することを特徴とする内燃機関の排ガス浄化システム。 - CeO2を含む担体に、RhとPdとPtの少なくとも一つが坦持された構成を有する排ガス浄化用触媒の使用方法であって、
前記排ガス浄化用触媒に流入する排ガスの温度である入ガス温が基準温度よりも高温の状態となった場合に還元処理必要フラグをONに設定する工程と、
前記還元処理必要フラグがONでかつ前記入ガス温が低下して前記基準温度以下の温度範囲である100℃以上400℃以下の温度範囲に入っている場合に、内燃機関に供給される吸気の空燃比を理論空燃比よりもリッチ側に調整する還元処理を実行する工程と、
該還元処理を実行した後に前記還元処理必要フラグをOFFに設定する工程と、
を含むことを特徴とする排ガス浄化用触媒の使用方法。
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JP2016255862A JP6604323B2 (ja) | 2016-12-28 | 2016-12-28 | 内燃機関の排ガス浄化システム及び排ガス浄化用触媒の使用方法 |
BR102017027739-9A BR102017027739A2 (pt) | 2016-12-28 | 2017-12-21 | sistema de purificação de gás de exaustão de motor de combustão interna, método de utilização de catalisador de purificação de gás de exaustão e método de controle de razão de ar para combustível |
US15/850,867 US10537852B2 (en) | 2016-12-28 | 2017-12-21 | Exhaust-gas-purifying system of internal combustion engine, method of using exhaust-gas-purifying catalyst and method of controlling air-fuel ratio |
MYPI2017704960A MY186978A (en) | 2016-12-28 | 2017-12-21 | Exhaust-gas-purifying system of internal combustion engine, method of using exhaust-gas-purifying catalyst and method of controlling air-fuel ratio |
EP17210168.5A EP3342996B1 (en) | 2016-12-28 | 2017-12-22 | Exhaust-gas-purifying system of internal combustion engine, method of using exhaust-gas-purifying catalyst and method of controlling air-fuel ratio |
RU2017145294A RU2684866C1 (ru) | 2016-12-28 | 2017-12-22 | Система очистки выхлопных газов двигателя внутреннего сгорания и способ использования каталитического нейтрализатора выхлопных газов |
CN201711436245.9A CN108252814B (zh) | 2016-12-28 | 2017-12-26 | 内燃机的排气净化系统、排气净化用催化剂的使用方法和空燃比的控制方法 |
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JP2004245182A (ja) * | 2003-02-17 | 2004-09-02 | Toyota Motor Corp | 内燃機関の排気浄化装置 |
JP4417878B2 (ja) * | 2005-05-16 | 2010-02-17 | いすゞ自動車株式会社 | 排気ガス浄化方法及び排気ガス浄化システム |
JP2007002802A (ja) * | 2005-06-27 | 2007-01-11 | Nissan Motor Co Ltd | 排気ガス浄化システム |
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JP2009275631A (ja) * | 2008-05-15 | 2009-11-26 | Toyota Motor Corp | 車両の制御装置および制御方法 |
BRPI1011478B1 (pt) * | 2009-03-04 | 2018-01-30 | Nissan Motor Co.,Ltd | catalisador purificador de gás de exaustão e método para a fabricação do mesmo |
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JP5287884B2 (ja) * | 2011-01-27 | 2013-09-11 | トヨタ自動車株式会社 | 排ガス浄化用触媒 |
US9169758B2 (en) * | 2011-04-13 | 2015-10-27 | Toyota Jidosha Kabushiki Kaisha | Fuel injection control system of an internal combustion engine |
JP5862868B2 (ja) * | 2011-11-18 | 2016-02-16 | 三菱自動車工業株式会社 | エンジンの排気浄化装置 |
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BR102017027739A2 (pt) | 2018-12-04 |
CN108252814B (zh) | 2021-05-07 |
US20180178165A1 (en) | 2018-06-28 |
JP2018105292A (ja) | 2018-07-05 |
US10537852B2 (en) | 2020-01-21 |
RU2684866C1 (ru) | 2019-04-15 |
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