JP2020168587A - 自動車用排ガス浄化触媒 - Google Patents
自動車用排ガス浄化触媒 Download PDFInfo
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- JP2020168587A JP2020168587A JP2019069681A JP2019069681A JP2020168587A JP 2020168587 A JP2020168587 A JP 2020168587A JP 2019069681 A JP2019069681 A JP 2019069681A JP 2019069681 A JP2019069681 A JP 2019069681A JP 2020168587 A JP2020168587 A JP 2020168587A
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- nox
- exhaust gas
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- 238000000746 purification Methods 0.000 title claims abstract description 104
- 239000003054 catalyst Substances 0.000 title claims abstract description 67
- 238000002336 sorption--desorption measurement Methods 0.000 claims description 50
- 238000010030 laminating Methods 0.000 claims description 2
- 239000012298 atmosphere Substances 0.000 abstract description 9
- 230000014509 gene expression Effects 0.000 abstract 3
- 238000010276 construction Methods 0.000 abstract 2
- 238000003475 lamination Methods 0.000 abstract 1
- 229910002089 NOx Inorganic materials 0.000 description 69
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 39
- 239000007789 gas Substances 0.000 description 23
- 229910052809 inorganic oxide Inorganic materials 0.000 description 12
- 239000002002 slurry Substances 0.000 description 11
- 239000002585 base Substances 0.000 description 10
- 239000000463 material Substances 0.000 description 10
- 239000010948 rhodium Substances 0.000 description 10
- 229930195733 hydrocarbon Natural products 0.000 description 9
- 150000002430 hydrocarbons Chemical class 0.000 description 9
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 8
- 229910000510 noble metal Inorganic materials 0.000 description 8
- 229910052703 rhodium Inorganic materials 0.000 description 8
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical group [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- 239000003638 chemical reducing agent Substances 0.000 description 7
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 description 6
- 229910002091 carbon monoxide Inorganic materials 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 238000010304 firing Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 241001124569 Lycaenidae Species 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 229910017493 Nd 2 O 3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- ITHZDDVSAWDQPZ-UHFFFAOYSA-L barium acetate Chemical compound [Ba+2].CC([O-])=O.CC([O-])=O ITHZDDVSAWDQPZ-UHFFFAOYSA-L 0.000 description 1
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 1
- CSSYLTMKCUORDA-UHFFFAOYSA-N barium(2+);oxygen(2-) Chemical class [O-2].[Ba+2] CSSYLTMKCUORDA-UHFFFAOYSA-N 0.000 description 1
- 229910052728 basic metal Inorganic materials 0.000 description 1
- 150000003818 basic metals Chemical class 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 239000006255 coating slurry Substances 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 230000001590 oxidative effect 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
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- NFOHLBHARAZXFQ-UHFFFAOYSA-L platinum(2+);dihydroxide Chemical compound O[Pt]O NFOHLBHARAZXFQ-UHFFFAOYSA-L 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- VXNYVYJABGOSBX-UHFFFAOYSA-N rhodium(3+);trinitrate Chemical compound [Rh+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VXNYVYJABGOSBX-UHFFFAOYSA-N 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Exhaust Gas After Treatment (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
Abstract
Description
そして、上記触媒層が、上記一体構造型担体側から順に、第1浄化層、NOx吸脱着層、第2浄化層が積層されて構成され、
上記一体構造型担体の単位容積当たりの上記触媒層の付着量(g/L)が、下記式(1)及び下記式(2)の関係を満たすことを特徴とする;
第1浄化層:第2浄化層=0.428:1〜1.5:1 ・・・式(1)
NOx吸脱着層:(第1浄化層+第2浄化層)=1.9:1〜2.45:1 ・・・式(2)
上記自動車用排ガス浄化触媒は、図1に示すように、 セラミックや金属ハニカム等の一体構造型担体上に、貴金属などの触媒成分を含む触媒層を備え、上記触媒層は、上記一体構造型担体側から順に、第1浄化層、NOx吸脱着層、第2浄化層が積層されて成る。
浄化層における、還元剤(R)による窒素酸化物の浄化反応を下記反応式に示す。
NOx + R → 1/2N2 + ROx ・・・反応式
第1浄化層:第2浄化層=0.428:1〜1.5:1 ・・・式(1)
NOx吸脱着層:(第1浄化層+第2浄化層)=1.9:1〜2.45:1 ・・・式(2)
NOx吸脱着層の触媒成分としては、PtやPd等の白金族の貴金属が用いられ、窒素酸化物吸着成分と共に一緒に無機酸化物基材上に担持される。
本発明の排ガス浄化触媒は、ハニカム等の一体構造型担体上に、前記触媒成分を担持させることができればよく、公知の製造方法により作製することができる。
ジルコニア(平均粒子径25μm、BET比表面積約180m2/g)と硝酸ロジウムとを混合し、水分減量がなくなるまで乾燥した後、耐久炉500℃で1時間焼成し、ロジウム担持ジルコニア粉末を得た。
このロジウム担持ジルコニア粉末とアルミナゾルとを混合し、水を加えて浄化層塗工用スラリー得た。
アルミナ(平均粒子径15μm、BET比表面積約60m2/g)とテトラアンミン白金水酸塩溶液とを混合し、水分減量がなくなるまで乾燥した後、耐久炉850℃で1時間焼成し、白金担持アルミナ粉末を得た。
この白金担持アルミナ粉末とアルミナゾルとを混合し、水を加えてNOx吸脱着層塗工用スラリー得た。
容量が2.1Lの一体構造型担体(ハニカム)に、焼成後の付着量が44g/Lになるように浄化層塗工用スラリーを塗布・乾燥した後、耐久炉850℃で1時間焼成して第1浄化層を形成した。
第1浄化層、NOx吸脱着層、第2浄化層を、表1に示す付着量に替える他は実施例1と同様にして、排ガス浄化触媒を得た。
排ガス浄化触媒をコンバータに挿入して2,2Lディーゼルエンジンの実車に搭載し、JCO8モード ホット及びコールドコンバインでのトータル残存率評価を行った。
評価結果を表1に示す。
残存率=未反応量/発生量×100
浄化率=100−残存率
2 触媒層
21 第1浄化層
22 第2浄化層
23 NOx吸脱着層
Claims (2)
- 一体構造型担体上に触媒層を備える自動車用排ガス浄化触媒であって、
上記触媒層が、上記一体構造型担体側から順に、第1浄化層、NOx吸脱着層、第2浄化層が積層されて構成され、
上記一体構造型担体の単位容積当たりの上記触媒層の付着量(g/L)が、下記式(1)及び下記式(2)の関係を満たすことを特徴とする自動車用排ガス浄化触媒。
第1浄化層:第2浄化層=0.428:1〜1.5:1 ・・・式(1)
NOx吸脱着層:(第1浄化層+第2浄化層)=1.9:1〜2.45:1 ・・・式(2) - 上記第1浄化層と上記第2浄化層とが、同一の触媒成分を含むことを特徴とする請求項1に記載の自動車用排ガス浄化触媒。
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001286769A (ja) * | 2000-02-01 | 2001-10-16 | Nissan Motor Co Ltd | 排気ガス浄化用触媒 |
JP2004313972A (ja) * | 2003-04-17 | 2004-11-11 | Ict:Kk | 排ガス浄化用触媒および排気ガスの浄化方法 |
US20090175773A1 (en) * | 2008-01-08 | 2009-07-09 | Chen Shau-Lin F | Multilayered Catalyst Compositions |
JP2010106799A (ja) * | 2008-10-31 | 2010-05-13 | Nissan Motor Co Ltd | 排気浄化システム |
JP2011183316A (ja) * | 2010-03-09 | 2011-09-22 | Mazda Motor Corp | 排気ガス浄化用触媒 |
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- 2019-04-01 JP JP2019069681A patent/JP7228451B2/ja active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001286769A (ja) * | 2000-02-01 | 2001-10-16 | Nissan Motor Co Ltd | 排気ガス浄化用触媒 |
JP2004313972A (ja) * | 2003-04-17 | 2004-11-11 | Ict:Kk | 排ガス浄化用触媒および排気ガスの浄化方法 |
US20090175773A1 (en) * | 2008-01-08 | 2009-07-09 | Chen Shau-Lin F | Multilayered Catalyst Compositions |
JP2010106799A (ja) * | 2008-10-31 | 2010-05-13 | Nissan Motor Co Ltd | 排気浄化システム |
JP2011183316A (ja) * | 2010-03-09 | 2011-09-22 | Mazda Motor Corp | 排気ガス浄化用触媒 |
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