JP2017115786A - 排ガスフィルタ - Google Patents
排ガスフィルタ Download PDFInfo
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- JP2017115786A JP2017115786A JP2015254097A JP2015254097A JP2017115786A JP 2017115786 A JP2017115786 A JP 2017115786A JP 2015254097 A JP2015254097 A JP 2015254097A JP 2015254097 A JP2015254097 A JP 2015254097A JP 2017115786 A JP2017115786 A JP 2017115786A
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- exhaust gas
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- cell wall
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- 210000004027 cell Anatomy 0.000 claims abstract description 136
- 210000002421 cell wall Anatomy 0.000 claims abstract description 80
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000011148 porous material Substances 0.000 claims abstract description 21
- 239000006104 solid solution Substances 0.000 claims abstract description 14
- 239000000470 constituent Substances 0.000 claims abstract description 9
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims abstract description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 20
- 239000011230 binding agent Substances 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 8
- 239000003426 co-catalyst Substances 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 178
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 17
- 239000001301 oxygen Substances 0.000 abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 abstract description 17
- 238000003860 storage Methods 0.000 abstract description 17
- 230000000630 rising effect Effects 0.000 abstract description 3
- 239000000243 solution Substances 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 28
- 239000003054 catalyst Substances 0.000 description 19
- 229910000510 noble metal Inorganic materials 0.000 description 15
- 238000000746 purification Methods 0.000 description 14
- 239000013618 particulate matter Substances 0.000 description 13
- 230000015572 biosynthetic process Effects 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 239000000446 fuel Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 229910052878 cordierite Inorganic materials 0.000 description 4
- 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 4
- 230000000694 effects Effects 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
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- 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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- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
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- F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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Abstract
【解決手段】複数のセル壁2と、セル壁2によって囲まれた複数のセル孔3と、少なくとも一部のセル孔3の端部を封止する栓部4とを有する排ガスフィルタ1である。セル壁2には、隣り合うセル孔3を連通する細孔が形成されている。セル壁2は、その構成成分にセリア、ジルコニア、及びセリア−ジルコニア固溶体からなるグループより選ばれる少なくとも1種の助触媒を含有する。
【選択図】図1
Description
該セル壁によって囲まれた複数のセル孔(3)と、
少なくとも一部の上記セル孔の端部を封止する栓部(4)と、を有し、
上記セル壁には、隣り合うセル孔を連通する細孔(20)が形成されており、
上記セル壁は、該セル壁の構成成分に、セリア、ジルコニア、及びセリア−ジルコニア固溶体からなるグループより選ばれる少なくとも1種の助触媒(21)を含有する、排ガスフィルタ(1)にある。
なお、括弧内の符号は、参考のために付したものであり、発明を限定するものではない。
排ガスフィルタの実施形態について、図1〜図4を参照して説明する。図1〜図3に例示されるように、本実施形態の排ガスフィルタ1は、多数のセル壁2と、これらのセル壁2によって囲まれた多数のセル孔3とを有する。排ガスフィルタ1は、さらに、各セル孔3の両端31、32のいずれか一方を封止する栓部4を有する。
次に、排ガスフィルタを軸方向に貫通する開放セル孔を有する排ガスフィルタの実施形態について説明する。図5及び図6に例示されるように、本実施形態においては、セル孔3は、排ガスフィルタ1を軸方向Xに貫通する開放セル孔33と、排ガスフィルタ1の上流側端部31を閉塞する栓部4が配設された栓詰めセル孔34とからなる。栓部4はセル3の上流側端部31に設けられている。いずれのセル3の下流側端部32にも栓部4は設けられておらず、セル3の下流側端部32は開放されている。
次に、内周形状が八角形のセル孔と、内周形状が四角形のセル孔とを有する排ガスフィルタの実施形態について説明する。図7及び図8に例示されるように、本実施形態の排ガスフィルタ1は、セル孔3として、内周形状が八角形のセル孔3aと、内周形状が四角形のセル孔3bとを有する。セル孔3は、実施形態2と同様に、排ガスフィルタ1を軸方向Xに貫通する開放セル孔33と、排ガスフィルタ1の上流側端部31を閉塞する栓部4が配設された栓詰めセル孔34とからなる。栓部4はセル3の上流側端部31に設けられている。いずれのセル3の下流側端部32にも栓部4は設けられておらず、セル3の下流側端部32は開放されている。その他の構成は、実施形態1と同様である。
次に、排ガスフィルタの実施例と比較例について、酸素吸蔵能及び昇温性能を比較する。本実験例においては、実施例1、比較例1、比較例2の3種類の排ガスフィルタについて評価を行う。各排ガスフィルタは、いずれも、円柱形状であり、直径Φが103mm、軸方向の長さLが105mmである。
実施例1、比較例1、比較例2の各排ガスフィルタをそれぞれ排気量2.5Lのガソリンエンジンの排気系に搭載した。排ガスフィルタへの入りガス温度が約600℃となり、排ガスの空燃比A/Fが理論空燃比の14.6となるように調整した。次いで、排ガスの流れ方向における排ガスフィルタの下流に設置したO2センサの出力をモニタしながら、空燃比を理論空燃比からリッチ状態の14.1及びリーン状態の1.51にそれぞれ切り替えた。この切り替え時のO2センサの出力遅れを測定することにより、排ガスフィルタの酸素吸蔵量を算出した。その結果を表1に示す。
実施例1、比較例1、比較例2の各排ガスフィルタをそれぞれ排気量2.5Lのガソリンエンジンの排気系に搭載した。排ガスフィルタは、水冷配管を介してエンジンのエキゾーストマニホールドから離れた位置に設置した。エンジンを理論空燃比で駆動し、水冷配管内を流れる冷却水により、排ガスフィルタの入口温度を100℃になるように調整した。なお、入口温度とは、排ガスの流れ方向における排ガスフィルタの上流側端部の温度である。次いで、冷却水の流量を調整することにより、排ガスフィルタの入口温度を図10に示すように昇温させた。このとき、排ガスフィルタの温度を経時的に測定した。図10において、横軸は測定開始からの経過時間を示し、縦軸は排ガスフィルタの温度を示す。図10において、グラフEは、実施例1の結果であり、グラフC1は比較例1の結果であり、グラフC2は、比較例2の結果である。また、グラフGは、排ガスフィルタに流入する排ガスの温度である。各排ガスフィルタにはいずれも同量の熱量が供給されている。
2 セル壁
20 細孔
21 助触媒
3 セル孔
Claims (7)
- 複数のセル壁(2)と、
該セル壁によって囲まれた複数のセル孔(3)と、
少なくとも一部の上記セル孔の端部を封止する栓部(4)と、を有し、
上記セル壁には、隣り合うセル孔を連通する細孔(20)が形成されており、
上記セル壁は、該セル壁の構成成分に、セリア、ジルコニア、及びセリア−ジルコニア固溶体からなるグループより選ばれる少なくとも1種の助触媒(21)を含有する、排ガスフィルタ(1)。 - 上記セル壁は、セリア−ジルコニア固溶体を主成分とし、さらにθアルミナ、無機バインダを含む材料で構成される、請求項1に記載の排ガスフィルタ。
- 上記栓部は、該栓部の構成成分に上記助触媒を含有する、請求項1又は2に記載の排ガスフィルタ。
- 上記セル孔の両端のいずれか一方が上記栓部によって封止されており、該栓部は、隣り合う上記セル孔の上流側端部(31)又は下流側端部(32)を交互に封止する、請求項1〜3のいずれか1項に記載の排ガスフィルタ。
- 上記セル孔は、上記排ガスフィルタを軸方向(X)において貫通する開放セル孔(33)と、上記セル孔の上流側端部(31)を閉塞する上記栓部が配設された栓詰めセル孔(34)とからなる、請求項1〜3のいずれか1項に記載の排ガスフィルタ。
- 上記排ガスフィルタの上記軸方向と直交する断面において、上記開放セル孔における流路断面積よりも、上記栓詰めセル孔における流路断面積が大きい、請求項5に記載の排ガスフィルタ。
- 上記セル孔は、内周形状が八角形のセル孔(3a)と、内周形状が四角形のセル孔(3b)とからなり、上記八角形のセル孔の水力直径は、上記八角形のセル孔の水力直径よりも大きく、上記八角形のセル孔と上記四角形のセル孔とを交互に並べて形成されている、請求項1〜6のいずれか1項に記載の排ガスフィルタ。
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US16/065,367 US20190091628A1 (en) | 2015-12-25 | 2016-11-16 | Exhaust gas filter |
PCT/JP2016/083879 WO2017110313A1 (ja) | 2015-12-25 | 2016-11-16 | 排ガスフィルタ |
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WO2019176868A1 (ja) | 2018-03-13 | 2019-09-19 | イビデン株式会社 | ハニカムフィルタ及びハニカムフィルタの製造方法 |
WO2020262173A1 (ja) | 2019-06-26 | 2020-12-30 | 株式会社キャタラー | 排ガス浄化触媒装置 |
WO2021044874A1 (ja) * | 2019-09-04 | 2021-03-11 | イビデン株式会社 | ハニカムフィルタ及びハニカムフィルタの製造方法 |
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