JP2016077980A - 排ガス浄化装置 - Google Patents
排ガス浄化装置 Download PDFInfo
- Publication number
- JP2016077980A JP2016077980A JP2014213110A JP2014213110A JP2016077980A JP 2016077980 A JP2016077980 A JP 2016077980A JP 2014213110 A JP2014213110 A JP 2014213110A JP 2014213110 A JP2014213110 A JP 2014213110A JP 2016077980 A JP2016077980 A JP 2016077980A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- catalyst
- catalyst part
- partition wall
- gas purification
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000746 purification Methods 0.000 title claims abstract description 53
- 239000003054 catalyst Substances 0.000 claims abstract description 149
- 239000011148 porous material Substances 0.000 claims abstract description 100
- 238000005192 partition Methods 0.000 claims abstract description 91
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 36
- 229910052703 rhodium Inorganic materials 0.000 claims abstract description 26
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 25
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims description 120
- 239000000463 material Substances 0.000 claims description 30
- 238000002485 combustion reaction Methods 0.000 claims description 18
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 12
- 239000001301 oxygen Substances 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 12
- 239000003502 gasoline Substances 0.000 claims description 11
- 239000002250 absorbent Substances 0.000 claims description 10
- 230000002745 absorbent Effects 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 5
- 238000000638 solvent extraction Methods 0.000 claims 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 65
- 239000010948 rhodium Substances 0.000 description 57
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 52
- 239000002002 slurry Substances 0.000 description 46
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 19
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 16
- 239000002585 base Substances 0.000 description 16
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 14
- 239000002131 composite material Substances 0.000 description 14
- 239000013618 particulate matter Substances 0.000 description 14
- 229930195733 hydrocarbon Natural products 0.000 description 11
- 150000002430 hydrocarbons Chemical class 0.000 description 11
- 239000000843 powder Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 239000000446 fuel Substances 0.000 description 8
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 7
- 229910002091 carbon monoxide Inorganic materials 0.000 description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000004453 electron probe microanalysis Methods 0.000 description 6
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 6
- 230000003197 catalytic effect Effects 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005275 alloying Methods 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 4
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- -1 for example Inorganic materials 0.000 description 4
- 229910052746 lanthanum Inorganic materials 0.000 description 4
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000010970 precious metal Substances 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 229910052727 yttrium Inorganic materials 0.000 description 4
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 238000007664 blowing Methods 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 229910052741 iridium Inorganic materials 0.000 description 3
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 150000001553 barium compounds Chemical class 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052809 inorganic oxide Inorganic materials 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 229910052762 osmium Inorganic materials 0.000 description 2
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 description 2
- 229910052707 ruthenium Inorganic materials 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 229910052723 transition metal Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- ODUCDPQEXGNKDN-UHFFFAOYSA-N Nitrogen oxide(NO) Natural products O=N ODUCDPQEXGNKDN-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 229910052792 caesium Inorganic materials 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
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- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
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Abstract
【解決手段】入側セルと出側セルと多孔質の隔壁16とを有するウォールフロー構造の基材と、隔壁16の内部細孔のうち相対的に細孔径が小さい小細孔18aに形成された第1触媒部20と、隔壁16の内部細孔のうち相対的に細孔径が大きい大細孔18bに形成された第2触媒部30とを備え、第1触媒部20は、担体と、該担体に担持されたPt、Pd及びRhから1種又は2種の貴金属とを含有し、第2触媒部20は、担体と、該担体に担持されたPt、Pd及びRhから1種又は2種の貴金属であって少なくとも第1触媒部20に含まれる貴金属以外の貴金属とを含有する排ガス浄化装置。
【選択図】図4
Description
基材10としては、従来のこの種の用途に用いられる種々の素材及び形態のものが使用可能である。例えば、コージェライト、炭化ケイ素(SiC)等のセラミックスまたは合金(ステンレス等)から形成された基材を好適に採用することができる。一例として外形が円筒形状(本実施形態)である基材が例示される。ただし、基材全体の外形については、円筒形に代えて、楕円筒形、多角筒形を採用してもよい。かかる基材10は、排ガス流入側の端部のみが開口した入側セル12と、該入側セル12に隣接し排ガス流出側の端部のみが開口した出側セル14と、入側セル12と出側セル14とを仕切る多孔質の隔壁16とを有している。
入側セル12は、排ガス流入側の端部のみが開口しており、出側セル14は、入側セル12に隣接し排ガス流出側の端部のみが開口している。この実施形態では、入側セル12は、排ガス流出側の端部が封止部12aで目封じされており、出側セル14は、排ガス流入側の端部が封止部14aで目封じされている。入側セル12および出側セル14は、フィルタ100に供給される排ガスの流量や成分を考慮して適当な形状および大きさに設定するとよい。例えば入側セル12および出側セル14の形状は、正方形、平行四辺形、長方形、台形などの矩形、三角形、その他の多角形(例えば、六角形、八角形)、円形など種々の幾何学形状であってよい。
隣接する入側セル12と出側セル14との間には、隔壁16が形成されている。この隔壁16によって入側セル12と出側セル14とが仕切られている。隔壁16は、排ガスが通過可能な多孔質構造である。隔壁16の気孔率としては特に限定されないが、概ね50%〜70%にすることが適当であり、好ましくは55%〜65%である。隔壁16の気孔率が小さすぎると、圧力損失が増大してしまうことがあり、一方、隔壁16の気孔率が大きすぎると、フィルタ100の機械的強度が低下傾向になるため、好ましくない。隔壁16の厚みとしては特に限定されないが、概ね200μm〜800μm程度であるとよい。このような隔壁の厚みの範囲内であると、PMの捕集効率を損なうことなく圧損の上昇を抑制する効果が得られる。
第1触媒部20は、隔壁16の内部細孔18a、18bのうち小細孔18aの壁表面に形成されている。小細孔18aは、隔壁16内で複雑に入り組んだ経路(貫通していない迂回した経路)を形成しているため、排ガスが長く滞留する傾向がある。そのため、小細孔18aに第1触媒部20を形成することによって、排ガスを効率よく浄化することができる。第1触媒部20が形成された小細孔18aの細孔直径は、第2触媒部30が形成された大細孔18bの細孔直径よりも小さければよい。例えば、第1触媒部20が形成された小細孔18aの水銀圧入法もしくは電子顕微鏡(Scanning Electron Microscope:SEM)での画像観察に基づく平均細孔直径は、概ね10μm以下(例えば0.1μm以上10μm以下)であることが好ましく、8μm以下であることがより好ましく、5μm以下であることが特に好ましい。このような小細孔18aの細孔直径の範囲内であると、小細孔18aに形成された第1触媒部20によって排ガスを効率よく浄化することができる。第1触媒部20によって浄化される有害成分としては特に限定されないが、例えばHC、COおよびNOxが例示される。第1触媒部20は、担体(図示省略)と、該担体に担持された貴金属(図示省略)とを備えている。
第2触媒部30は、隔壁16の内部細孔18a、18bのうち大細孔18bの壁表面に形成されている。大細孔18bは、隔壁16を厚み方向に連通しているため、排ガスが円滑に通過する傾向がある。そのため、大細孔18bに第2触媒部30を形成することによって、圧損の上昇を抑えつつ排ガスを浄化することができる。第2触媒部30が形成された大細孔18bの細孔直径は、第1触媒部20が形成された小細孔18aの細孔直径よりも大きければよい。例えば、第2触媒部30が形成された大細孔18bの水銀圧入法もしくは電子顕微鏡(SEM)での画像観察に基づく平均細孔直径は、概ね10μmを上回る(例えば10μmを超えかつ100μm以下である)ことが好ましく、15μm以上であることがより好ましく、20μm以上であることが特に好ましい。このような大細孔18bの細孔直径の範囲内であると、大細孔18bに形成された第2触媒部30によって圧損の上昇を抑えつつ排ガスを浄化することができる。第2触媒部30によって浄化される有害成分としては特に限定されないが、例えばHC、COおよびNOxが例示される。第2触媒部30は、担体(図示省略)と、該担体に担持された貴金属(図示省略)とを備えている。
第1触媒部20および第2触媒部30を形成するに際しては、第1触媒部20と、第2触媒部30とで異なるスラリーを基に形成するとよい。例えば、第1触媒部20を形成するための第1スラリーと、第2触媒部30を形成するための第2スラリーとを用意するとよい。
第1触媒部形成用の担体としてのセリア−ジルコニア複合酸化物を用意し、貴金属触媒溶液としてジニトロジアミンPt溶液に含浸させた後、蒸発乾固してPtを1.91質量%担持したPt/セリア−ジルコニア複合酸化物担体粉末を調製した。このPt/セリア−ジルコニア複合酸化物担体粉末62.2質量部と、La安定化アルミナ36.61質量部と、BaSO418.32質量部と、アルミナバインダ2.44質量部と、イオン交換水とを混合して第1スラリーを調製した。次いで、この第1スラリーにコージェライト製のウォールフロー型基材(直径103mm、全長105mm)を浸漬し、加圧したガスを吹き付けて余分なスラリーを吹き払った後、乾燥・焼成することにより、隔壁16の内部に第1触媒部20を形成した。基材の体積1L当たりの第1触媒部の質量は52.85gとし、基材の体積1L当たりのPtの質量は0.5251gとした。
比較のために、隔壁内部にPtとRhの混合触媒部を形成したフィルタ触媒を作製した。具体的には、Rh/アルミナ担体粉末36.9質量部と、セリア−ジルコニア複合酸化物36.61質量部と、Pt/セリア−ジルコニア複合酸化物担体粉末62.2質量部と、アルミナ36.61質量部と、BaSO418.32質量部と、イオン交換水とを混合して混合触媒部形成用スラリーを調製した。次いで、このスラリーにウォールフロー型基材を浸漬し、余分なスラリーを吹き払った後、乾燥・焼成することにより、隔壁の内部に混合触媒部を形成した。基材の体積1L当たりのPtおよびRhの質量は実施例と同条件とした。
2 内燃機関
10 基材
12 入側セル
14 出側セル
16 隔壁
18a 小細孔
18b 大細孔
20 第1触媒部
30 第2触媒部
100 パティキュレートフィルタ
Claims (7)
- 内燃機関の排気通路に配置され、該内燃機関から排出される排ガスを浄化する排ガス浄化装置であって、
排ガス流入側の端部のみが開口した入側セルと、該入側セルに隣接し排ガス流出側の端部のみが開口した出側セルと、前記入側セルと前記出側セルとを仕切る多孔質の隔壁とを有するウォールフロー構造の基材と、
前記隔壁の内部細孔のうち相対的に細孔径が小さい小細孔に形成された第1触媒部と、
前記隔壁の内部細孔のうち相対的に細孔径が大きい大細孔に形成された第2触媒部と
を備え、
前記第1触媒部は、担体と、該担体に担持されたPt、PdおよびRhのうちのいずれか1種または2種の貴金属とを含有し、
前記第2触媒部は、担体と、該担体に担持されたPt、PdおよびRhのうちのいずれか1種または2種の貴金属であって少なくとも前記第1触媒部に含まれる貴金属以外の貴金属とを含有する、排ガス浄化装置。 - 前記第1触媒部が形成された小細孔の平均細孔直径が10μm以下であり、
前記第2触媒部が形成された大細孔の平均細孔直径が10μmを上回り且つ100μm以下である、請求項1に記載の排ガス浄化装置。 - 前記第1触媒部は、前記貴金属としてPtを含んでおり、
前記第2触媒部は、前記貴金属としてRhを含んでいる、請求項1または2に記載の排ガス浄化装置。 - 前記基材の体積1L当たりについて、
前記第1触媒部における前記Ptの含有量が、0.3g〜1gであり、
前記第2触媒部における前記Rhの含有量が、0.1g〜0.5gである、請求項1〜3の何れか一つに記載の排ガス浄化装置。 - 前記第1触媒部は、NOx吸蔵能を有するNOx吸収材を含んでいる、請求項3または4に記載の排ガス浄化装置。
- 前記第2触媒部は、酸素吸蔵能を有するOSC材を含んでいる、請求項3〜5の何れか一つに記載の排ガス浄化装置。
- 前記内燃機関は、ガソリンエンジンである、請求項1〜6の何れか一つに記載の排ガス浄化装置。
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