JP5789126B2 - 排ガス酸化触媒 - Google Patents
排ガス酸化触媒 Download PDFInfo
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- JP5789126B2 JP5789126B2 JP2011117314A JP2011117314A JP5789126B2 JP 5789126 B2 JP5789126 B2 JP 5789126B2 JP 2011117314 A JP2011117314 A JP 2011117314A JP 2011117314 A JP2011117314 A JP 2011117314A JP 5789126 B2 JP5789126 B2 JP 5789126B2
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- catalyst
- catalyst layer
- exhaust gas
- slurry
- mass
- Prior art date
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- 239000003054 catalyst Substances 0.000 title claims description 391
- 230000003647 oxidation Effects 0.000 title claims description 51
- 238000007254 oxidation reaction Methods 0.000 title claims description 51
- 239000007789 gas Substances 0.000 claims description 109
- 239000004215 Carbon black (E152) Substances 0.000 claims description 74
- 229930195733 hydrocarbon Natural products 0.000 claims description 74
- 150000002430 hydrocarbons Chemical class 0.000 claims description 74
- 239000003463 adsorbent Substances 0.000 claims description 61
- 229910052751 metal Inorganic materials 0.000 claims description 51
- 239000002184 metal Substances 0.000 claims description 51
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 45
- 239000001301 oxygen Substances 0.000 claims description 45
- 229910052760 oxygen Inorganic materials 0.000 claims description 45
- 239000011232 storage material Substances 0.000 claims description 45
- 229910021536 Zeolite Inorganic materials 0.000 claims description 41
- 239000010457 zeolite Substances 0.000 claims description 41
- 150000004706 metal oxides Chemical class 0.000 claims description 20
- 229910044991 metal oxide Inorganic materials 0.000 claims description 19
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical group O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 16
- 239000010410 layer Substances 0.000 description 250
- 239000002002 slurry Substances 0.000 description 133
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 78
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 51
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 40
- 229910052697 platinum Inorganic materials 0.000 description 39
- 238000001035 drying Methods 0.000 description 34
- 229910052763 palladium Inorganic materials 0.000 description 20
- NWAHZABTSDUXMJ-UHFFFAOYSA-N platinum(2+);dinitrate Chemical compound [Pt+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O NWAHZABTSDUXMJ-UHFFFAOYSA-N 0.000 description 18
- 239000002131 composite material Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 13
- 239000000463 material Substances 0.000 description 10
- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- 229910002091 carbon monoxide Inorganic materials 0.000 description 8
- 150000001875 compounds Chemical class 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 238000010304 firing Methods 0.000 description 6
- 150000002736 metal compounds Chemical class 0.000 description 6
- QWDUNBOWGVRUCG-UHFFFAOYSA-N n-(4-chloro-2-nitrophenyl)acetamide Chemical compound CC(=O)NC1=CC=C(Cl)C=C1[N+]([O-])=O QWDUNBOWGVRUCG-UHFFFAOYSA-N 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 5
- DDPNPTNFVDEJOH-UHFFFAOYSA-N [O-2].[Zr+4].[O-2].[Ce+3] Chemical compound [O-2].[Zr+4].[O-2].[Ce+3] DDPNPTNFVDEJOH-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 238000001354 calcination Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
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- 239000000203 mixture Substances 0.000 description 3
- 239000002808 molecular sieve Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 231100000572 poisoning Toxicity 0.000 description 3
- 230000000607 poisoning effect Effects 0.000 description 3
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 description 2
- 229910000420 cerium oxide Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000012784 inorganic fiber Substances 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical group [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- VXAUWWUXCIMFIM-UHFFFAOYSA-N aluminum oxygen(2-) hydrate Chemical compound O.[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-N 0.000 description 1
- 229910001593 boehmite Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 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 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 239000013335 mesoporous material Substances 0.000 description 1
- 229910001960 metal nitrate Inorganic materials 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 239000012229 microporous material Substances 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 150000002898 organic sulfur compounds Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
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Description
(1)複数の排ガス流路が形成された触媒基材と、触媒基材の排ガス流路表面に形成された触媒層とを有する排ガス酸化触媒であって、最下面触媒層と、排ガス流路内に露出した最上面触媒層と、最下面触媒層と最上面触媒層との間に位置して設けられた中間触媒層とからなる触媒層が、排ガス流路表面の25%以上を被覆するように設けられ、最下面触媒層は触媒成分として、少なくとも酸素吸蔵剤を含有するが、炭化水素吸着剤は含有しておらず、中間触媒層は触媒成分として、少なくとも金属酸化物担体に担持された触媒金属と、炭化水素吸着剤とを含有し、最上面触媒層は触媒成分として少なくとも酸素吸蔵剤と炭化水素吸着剤とを含有していることを特徴とする排ガス酸化触媒、
(2)中間触媒層が、触媒成分及び/又は含有量の異なる2層以上の層よりなる上記(1)の排ガス酸化触媒、
(3)最上面触媒層は、酸素吸蔵剤と炭化水素吸着剤とともに、更に金属酸化物担体に担持された触媒金属を含有する上記(1)又は(2)の排ガス酸化触媒、
(4)炭化水素吸着剤が、ゼオライトである上記(1)〜(3)のいずれかの排ガス酸化触媒、
を要旨とするものである。
実施例1
各触媒層を形成するために下記のスラリーを調製した。
1)最下面触媒層形成用スラリー:酸素吸蔵剤として酸化セリウム酸化ジルコニウム複合化合物、酸化アルミニウムを含むスラリー(酸素吸蔵剤63質量%、酸化アルミニウム37質量%)。
2)中間触媒層形成用スラリー:炭化水素吸着剤としてβ−ゼオライト、触媒金属として白金、パラジウム(白金硝酸塩及びパラジウム硝酸塩として添加)、酸化アルミニウムを含むスラリー(炭化水素吸着剤11.2質量%、白金1.6質量%、パラジウム0.8質量%、酸化アルミニウム86.4質量%)。
3)最上面触媒層形成用スラリー:酸素吸蔵剤として酸化セリウム酸化ジルコニウム複合化合物、触媒金属として白金(白金硝酸塩として添加)、炭化水素吸着剤としてβ−ゼオライト、酸化アルミニウムを含むスラリー(酸素吸蔵剤27質量%、炭化水素吸着剤としてβ−ゼオライト45質量%、白金0.1質量%、酸化アルミニウム27.9質量%)。
ハニカム状の触媒基材(NGK製、1L)を、最下面触媒層形成用スラリーに浸漬し、乾燥時付着量が49g/Lとなるようにスラリーを塗布、乾燥した後、500℃で焼成し、最下面触媒層を形成した。次いで最下面触媒層上に、乾燥時付着量が110g/Lとなるように中間触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、中間触媒層を形成した。更にこの中間触媒層の上に、乾燥時付着量が50g/Lとなるように最上面触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、最上面触媒層を形成し、3層の触媒層を有する排ガス酸化触媒を得た(排ガス流路表面に対する3層の触媒層の割合100%)。
各触媒層を形成するために下記のスラリーを調製した。
1)最下面触媒層形成用スラリー:酸素吸蔵剤として酸化セリウム酸化ジルコニウム複合化合物、酸化アルミニウムを含むスラリー(酸素吸蔵剤63質量%、酸化アルミニウム37質量%)。
2)中間触媒層形成用スラリー:炭化水素吸着剤としてβ−ゼオライト及びZSM5ゼオライト、触媒金属として白金、パラジウム(白金硝酸塩及びパラジウム硝酸塩として添加)、酸化アルミニウムを含むスラリー(炭化水素吸着剤としてβ−ゼオライト5質量%及びZSM5ゼオライト5質量%、白金1.1質量%、パラジウム0.5質量%、酸化アルミニウム88.4質量%)。
3)最上面触媒層形成用スラリー:酸素吸蔵剤として酸化セリウム酸化ジルコニウム複合化合物、触媒金属として白金(白金硝酸塩として添加)、炭化水素吸着剤としてβ−ゼオライト及びZAM5ゼオライト、酸化アルミニウムを含むスラリー(酸素吸蔵剤27.4質量%、炭化水素吸着剤としてβ−ゼオライト22.5質量%及びZSM5ゼオライト22.5質量%、白金0.1質量%、酸化アルミニウム27.5質量%)。
ハニカム状の触媒基材(NGK製、1L)を、最下面触媒層形成用スラリーに浸漬し、乾燥時付着量が49g/Lとなるようにスラリーを塗布、乾燥した後、500℃で焼成し、最下面触媒層を形成した。次いで最下面触媒層上に、乾燥時付着量が110g/Lとなるように中間触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、中間触媒層を形成した。更にこの中間触媒層の上に、乾燥時付着量が60g/Lとなるように最上面触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、最上面触媒層を形成し、3層の触媒層を有する排ガス酸化触媒を得た(排ガス流路表面に対する3層の触媒層の割合100%)。
各触媒層を形成するために下記のスラリーを調製した。
1)最下面触媒層形成用スラリー:酸素吸蔵剤として酸化セリウム酸化ジルコニウム複合化合物、酸化アルミニウムを含むスラリー(酸素吸蔵剤63質量%、酸化アルミニウム37質量%)。
2)中間触媒層形成用スラリー:炭化水素吸着剤としてβ−ゼオライト、触媒金属として白金、パラジウム(白金硝酸塩及びパラジウム硝酸塩として添加)、酸化アルミニウムを含むスラリー(炭化水素吸着剤としてβ−ゼオライト9質量%、白金1.1質量%、パラジウム0.5質量%、酸化アルミニウム89.4質量%)。
3)最上面触媒層形成用スラリー:酸素吸蔵剤として酸化セリウム酸化ジルコニウム複合化合物、炭化水素吸着剤としてβ−ゼオライト、酸化アルミニウムを含むスラリー(酸素吸蔵剤31質量%、炭化水素吸着剤としてβ−ゼオライト36質量%、酸化アルミニウム33質量%)。
ハニカム状の触媒基材(NGK製、1L)を、最下面触媒層形成用スラリーに浸漬し、乾燥時付着量が55g/Lとなるようにスラリーを塗布、乾燥した後、500℃で焼成し、最下面触媒層を形成した。次いで最下面触媒層上に、乾燥時付着量が110g/Lとなるように中間触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、中間触媒層を形成した。更にこの中間触媒層の上に、乾燥時付着量が60g/Lとなるように最上面触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、最上面触媒層を形成し、3層の触媒層を有する排ガス酸化触媒を得た(排ガス流路表面に対する3層の触媒層の割合100%)。
酸素吸蔵剤を含有する最下面触媒層を形成することなく、下記触媒金属層形成用スラリー、最上面触媒層形成用スラリーを用いて排ガス酸化触媒を製造した。
1)触媒金属含有層形成用スラリー:触媒金属として白金及びパラジウム(白金硝酸塩、パラジウム硝酸塩として添加)、酸化アルミニウムを含むスラリー(白金1.0質量%、パラジウム0.5質量%、無機担体98.5質量%)。
2)最上面触媒層形成用スラリー:炭化水素吸着剤としてβ−ゼオライト、触媒金属として白金(白金硝酸塩として添加)、酸化アルミニウムを含むスラリー(炭化水素吸着剤としてβ−ゼオライト63.9質量%、白金0.1質量%、酸化アルミニウム36質量%)。
ハニカム状の触媒基材(NGK製、1L)を、触媒金属含有層形成用スラリーに浸漬し、乾燥時付着量が178g/Lとなるようにスラリーを塗布、乾燥した後、500℃で焼成し、触媒金属含有層を形成した。触媒金属含有層の上に、最上面側触媒層形成用スラリーを、乾燥時付着量が60g/Lとなるように塗布、乾燥した後、500℃で焼成し、最上面側触媒層を形成し、2層の触媒層を有する排ガス酸化触媒を得た(排ガス流路表面に対する2層の触媒層の割合100%)。
炭化水素吸着剤としてβ−ゼオライト、触媒金属として白金及びパラジウム(白金硝酸塩、パラジウム硝酸塩として添加)、酸化アルミニウムを含むスラリー(炭化水素吸着剤としてβ−ゼオライト47.72質量%、触媒金属として白金1.44質量%及びパラジウム0.72質量%、酸化アルミニウム50.12質量%)を、乾燥時付着量が180g/Lとなるようにハニカム状の触媒基材(NGK製、1L)に塗布、乾燥した後、500℃で焼成して触媒層を形成し、触媒金属を含有する1層の触媒層を有する排ガス酸化触媒を得た(排ガス流路表面に対する1層の触媒層の割合100%)。
各触媒層を形成するために下記のスラリーを調製した。
1)最下面触媒層形成用スラリー:酸化アルミニウム100質量%を含むスラリー(酸素吸蔵剤を含まず)。
2)中間触媒層形成用スラリー:炭化水素吸着剤としてβ−ゼオライト、触媒金属として白金及びパラジウム(白金硝酸塩及びパラジウム硝酸塩として添加)、酸化アルミニウムを含むスラリー(炭化水素吸着剤としてβ−ゼオライト11.2質量%、白金1.6質量%、パラジウム0.8質量%、酸化アルミニウム86.4質量%)。
3)最上面触媒層形成用スラリー:炭化水素吸着剤としてβゼオライト、触媒金属として白金(白金硝酸塩として添加)、酸化アルミニウムを含むスラリー(酸素吸蔵剤を含まず、炭化水素吸着剤としてβ−ゼオライト63.9質量%、白金0.1質量%、酸化アルミニウム36質量%)。
ハニカム状の触媒基材(NGK製、1L)を、最下面触媒層形成用スラリーに浸漬し、乾燥時付着量が49g/Lとなるようにスラリーを塗布、乾燥した後、500℃で焼成し、最下面側触媒層を形成した。次いで最下面触媒層上に、乾燥時付着量が110g/Lとなるように中間触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、中間触媒層を形成した。更にこの中間触媒層の上に、乾燥時付着量が50g/Lとなるように最上面触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、最上面触媒層を形成し、3層の触媒層を有する排ガス酸化触媒を得た(排ガス流路表面に対する3層の触媒層の割合100%)。
各触媒層を形成するために下記のスラリーを調製した。
1)最下面触媒層形成用スラリー:酸素吸蔵剤として酸化セリウム−酸化ジルコニウム複合酸化物、酸化アルミニウムを含むスラリー(酸素吸蔵剤63質量%、酸化アルミニウム37質量%)。
2)中間触媒層形成用スラリー:炭化水素吸着剤としてβ−ゼオライト、触媒金属として白金及びパラジウム(白金硝酸塩及びパラジウム硝酸塩として添加)、酸化アルミニウムを含むスラリー(炭化水素吸着剤としてβ−ゼオライト11.2質量%、白金1.6質量%、パラジウム0.8質量%、酸化アルミニウム86.4質量%)。
3)最上面触媒層形成用スラリー:炭化水素吸着剤としてβ−ゼオライト、触媒金属として白金(白金硝酸塩として添加)、酸化アルミニウムを含むスラリー(酸素吸蔵剤を含まず、炭化水素吸着剤としてβ−ゼオライト63.9質量%、白金0.1質量%、酸化アルミニウム36質量%)。
ハニカム状の触媒基材(NGK製、1L)を、最下面触媒層形成用スラリーに浸漬し、乾燥時付着量が49g/Lとなるようにスラリーを塗布、乾燥した後、500℃で焼成し、最下面触媒層を形成した。次いで最下面触媒層上に、乾燥時付着量が110g/Lとなるように中間触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、中間触媒層を形成した。更にこの中間触媒層の上に、乾燥時付着量が50g/Lとなるように最上面触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、最上面触媒層を形成し、3層の触媒層を有する排ガス酸化触媒を得た(排ガス流路表面に対する3層の触媒層の割合100%)。
各触媒層を形成するために下記のスラリーを調製した。
1)最下面触媒層形成用スラリー:酸素吸蔵剤として酸化セリウム−酸化ジルコニウム複合酸化物、酸化アルミニウム、触媒金属として白金(白金硝酸塩として添加)、炭化水素吸着剤としてβ−ゼオライトを含むスラリー(炭化水素吸着剤としてβ−ゼオライト47質量%、酸素吸蔵剤29質量%、酸化アルミニウム23.9質量%、白金0.1質量%)。
2)中間触媒層形成用スラリー:触媒金属として白金及びパラジウム(白金硝酸塩及びパラジウム硝酸塩として添加)、酸化アルミニウムを含むスラリー(炭化水素吸着剤を含まず、白金2.4質量%、パラジウム1.2質量%、酸化アルミニウム96.4質量%)。
3)最上面触媒層形成用スラリー:炭化水素吸着剤としてβ−ゼオライト、酸素吸蔵剤として酸化セリウム−酸化ジルコニウム複合酸化物、触媒金属として白金(白金硝酸塩として添加)、酸化アルミニウムを含むスラリー(酸素吸蔵剤37.5質量%、炭化水素吸着剤としてβ−ゼオライト37.5質量%、白金0.1質量%、酸化アルミニウム24.9質量%)。
ハニカム状の触媒基材(NGK製、1L)を、最下面触媒層形成用スラリーに浸漬し、乾燥時付着量が52g/Lとなるようにスラリーを塗布、乾燥した後、500℃で焼成し、最下面触媒層を形成した。次いで最下面触媒層上に、乾燥時付着量が72g/Lとなるように中間触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、中間触媒層を形成した。更にこの中間触媒層の上に、乾燥時付着量が81g/Lとなるように最上面触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、最上面触媒層を形成し、3層の触媒層を有する排ガス酸化触媒を得た(排ガス流路表面に対する3層の触媒層の割合100%)。
各触媒層を形成するために下記のスラリーを調製した。
1)最下面触媒層形成用スラリー:酸素吸蔵剤として酸化セリウム−酸化ジルコニウム複合酸化物、酸化アルミニウムを含むスラリー(酸素吸蔵剤63質量%、酸化アルミニウム37質量%)。
2)中間触媒層形成用スラリー:触媒金属として白金及びパラジウム(白金硝酸塩及びパラジウム硝酸塩として添加)、酸化アルミニウムを含むスラリー(炭化水素吸着剤を含まず、白金1.1質量%、パラジウム0.5質量%、酸化アルミニウム98.4質量%)。
3)最上面触媒層形成用スラリー:炭化水素吸着剤としてβ−ゼオライト及びZSM5、酸素吸蔵剤として酸化セリウム−酸化ジルコニウム複合酸化物、触媒金属として白金(白金硝酸塩として添加)、酸化アルミニウムを含むスラリー(酸素吸蔵剤27.4質量%、炭化水素吸着剤としてβ−ゼオライト25質量%及びZSM5ゼオライト20質量%、白金0.1質量%、酸化アルミニウム27.5質量%)。
ハニカム状の触媒基材(NGK製、1L)を、最下面触媒層形成用スラリーに浸漬し、乾燥時付着量が49g/Lとなるようにスラリーを塗布、乾燥した後、500℃で焼成し、最下面触媒層を形成した。次いで最下面触媒層上に、乾燥時付着量が110g/Lとなるように中間触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、中間触媒層を形成した。更にこの中間触媒層の上に、乾燥時付着量が67g/Lとなるように最上面触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、最上面触媒層を形成し、3層の触媒層を有する排ガス酸化触媒を得た(排ガス流路表面に対する3層の触媒層の割合100%)。
各触媒層を形成するために下記のスラリーを調製した。
1)最下面触媒層形成用スラリー:バインダーとしてアルミナ100質量%を含むスラリー(酸素吸蔵剤を含まず)。
2)中間触媒層形成用スラリー:触媒金属として白金(白金硝酸塩として添加)、酸化アルミニウムを含むスラリー(炭化水素吸着剤を含まず、白金3.3質量%、酸化アルミニウム97.9質量%)。
3)最上面触媒層形成用スラリー:酸化アルミニウム100質量%を含むスラリー(酸素吸蔵剤、炭化水素吸着剤を含まず)。
ハニカム状の触媒基材(NGK製、1L)を、最下面触媒層形成用スラリーに浸漬し、乾燥時付着量が73g/Lとなるようにスラリーを塗布、乾燥した後、500℃で焼成し、最下面触媒層を形成した。次いで最下面触媒層上に、乾燥時付着量が55g/Lとなるように中間触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、中間触媒層を形成した。更にこの中間触媒層の上に、乾燥時付着量が47g/Lとなるように最上面触媒層形成用スラリーを塗布、乾燥した後、500℃で焼成し、最上面触媒層を形成し、3層の触媒層を有する排ガス酸化触媒を得た(排ガス流路表面に対する3層の触媒層の割合100%)。
実施例1で用いたと同じ最下面触媒層形成用スラリー、中間触媒層形成用スラリー及び最上面触媒層形成用スラリーを用い、まずハニカム状の触媒基材(NGK製、1L)を、最下面触媒層形成用スラリーに浸漬して、最下面触媒層形成用スラリーの塗布範囲が触媒基材の排ガス流路長の80%となるように塗布、乾燥させた後(乾燥時付着量49g/L)、500℃で焼成して最下面触媒層を形成した。次いでこの上に、中間触媒層形成用スラリーを、塗布範囲が排ガス流路長の100%となるように塗布、乾燥させた後(乾燥時付着量110g/L)、500℃で焼成して中間触媒層を形成した。更にこの上に最上面触媒層形成用スラリーを、塗布長さが排ガス流路長の80%となるように、最下面触媒層形成用スラリーの塗布位置と重なる位置に塗布、乾燥させた後乾燥時付着量50g/L)、500℃で焼成して最上面触媒層を形成し、3層の触媒層を有する排ガス酸化触媒を得た(排ガス流路表面に対する3層の触媒層の割合80%)。
実施例1で用いたと同じ最下面触媒層形成用スラリー、中間触媒層形成用スラリー及び最上面触媒層形成用スラリーを用い、まずハニカム状の触媒基材(NGK製、1L)を、最下面触媒層形成用スラリーに浸漬して、最下面触媒層形成用スラリーの塗布範囲が触媒基材の排ガス流路長の50%となるように塗布、乾燥させた後(乾燥時付着量49g/L)、500℃で焼成して最下面触媒層を形成した。次いでこの上に、中間触媒層形成用スラリーを、塗布範囲が排ガス流路長の100%となるように塗布、乾燥させた後(乾燥時付着量110g/L)、500℃で焼成して中間触媒層を形成した。更にこの上に最上面触媒層形成用スラリーを、塗布長さが排ガス流路長の50%となるように、最下面触媒層形成用スラリーの塗布位置と重なる位置に塗布、乾燥させた後乾燥時付着量50g/L)、500℃で焼成して最上面触媒層を形成し、3層の触媒層を有する排ガス酸化触媒を得た(排ガス流路表面に対する3層の触媒層の割合50%)。
2 排ガス流路
3 触媒基材
4 排ガス流路表面
5 触媒層
6 最下面触媒層
7 中間触媒層
8 最上面触媒層
Claims (4)
- 複数の排ガス流路が形成された触媒基材と、触媒基材の排ガス流路表面に形成された触媒層とを有する排ガス酸化触媒であって、最下面触媒層と、排ガス流路内に露出した最上面触媒層と、最下面触媒層と最上面触媒層との間に位置して設けられた中間触媒層とからなる触媒層が、排ガス流路表面の25%以上を被覆するように設けられ、最下面触媒層は触媒成分として、少なくとも酸素吸蔵剤を含有するが、炭化水素吸着剤は含有しておらず、中間触媒層は触媒成分として、少なくとも金属酸化物担体に担持された触媒金属と、炭化水素吸着剤とを含有し、最上面触媒層は触媒成分として少なくとも酸素吸蔵剤と炭化水素吸着剤とを含有していることを特徴とする排ガス酸化触媒。
- 中間触媒層が、触媒成分及び/又は含有量の異なる2層以上の層よりなる請求項1記載の排ガス酸化触媒。
- 最上面触媒層は、酸素吸蔵剤と炭化水素吸着剤とともに、更に金属酸化物担体に担持された触媒金属を含有する請求項1又は2に記載の排ガス酸化触媒。
- 炭化水素吸着剤が、ゼオライトである請求項1〜3のいずれかに記載の排ガス酸化触媒。
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GB201405868D0 (en) * | 2014-04-01 | 2014-05-14 | Johnson Matthey Plc | Diesel oxidation catalyst with NOx adsorber activity |
DE102015209987A1 (de) * | 2014-06-04 | 2015-12-10 | Johnson Matthey Public Limited Company | Nicht-PGM-Ammoniakschlupfkatalysator |
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GB2494218B (en) | 2013-09-04 |
JP2012245443A (ja) | 2012-12-13 |
BR112013030110A2 (pt) | 2020-12-01 |
GB201201218D0 (en) | 2012-03-07 |
DE102012208876B4 (de) | 2015-10-22 |
CN103561850A (zh) | 2014-02-05 |
US20140193306A1 (en) | 2014-07-10 |
RU2584420C2 (ru) | 2016-05-20 |
US8765067B1 (en) | 2014-07-01 |
EP2714247B1 (en) | 2018-03-28 |
GB2494218A (en) | 2013-03-06 |
KR20140045396A (ko) | 2014-04-16 |
WO2012160391A1 (en) | 2012-11-29 |
EP2714247A1 (en) | 2014-04-09 |
DE102012208876A1 (de) | 2012-11-29 |
RU2013157560A (ru) | 2015-06-27 |
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