JP7402251B2 - 硫黄に対する耐久性に優れたscr触媒 - Google Patents
硫黄に対する耐久性に優れたscr触媒 Download PDFInfo
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- JP7402251B2 JP7402251B2 JP2021566518A JP2021566518A JP7402251B2 JP 7402251 B2 JP7402251 B2 JP 7402251B2 JP 2021566518 A JP2021566518 A JP 2021566518A JP 2021566518 A JP2021566518 A JP 2021566518A JP 7402251 B2 JP7402251 B2 JP 7402251B2
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- zeolite
- catalyst
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- scr catalyst
- exhaust gas
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- 239000003054 catalyst Substances 0.000 title claims description 122
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title description 9
- 229910052717 sulfur Inorganic materials 0.000 title description 9
- 239000011593 sulfur Substances 0.000 title description 9
- 239000010457 zeolite Substances 0.000 claims description 87
- 229910021536 Zeolite Inorganic materials 0.000 claims description 85
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 85
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 79
- 239000007789 gas Substances 0.000 claims description 38
- 150000003464 sulfur compounds Chemical class 0.000 claims description 29
- 239000011148 porous material Substances 0.000 claims description 23
- 238000006243 chemical reaction Methods 0.000 claims description 19
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 8
- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000011651 chromium Substances 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 239000011701 zinc Substances 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 24
- 238000004519 manufacturing process Methods 0.000 description 19
- 229910010413 TiO 2 Inorganic materials 0.000 description 17
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 14
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 14
- 235000011130 ammonium sulphate Nutrition 0.000 description 14
- 230000009849 deactivation Effects 0.000 description 14
- 230000008929 regeneration Effects 0.000 description 13
- 238000011069 regeneration method Methods 0.000 description 13
- 238000011156 evaluation Methods 0.000 description 12
- 230000007423 decrease Effects 0.000 description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 229910052815 sulfur oxide Inorganic materials 0.000 description 8
- 230000003247 decreasing effect Effects 0.000 description 6
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical class S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000005245 sintering Methods 0.000 description 5
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 5
- 229910052721 tungsten Inorganic materials 0.000 description 5
- 239000010937 tungsten Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 231100000572 poisoning Toxicity 0.000 description 4
- 230000000607 poisoning effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 150000003863 ammonium salts Chemical class 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000004408 titanium dioxide Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- HIVLDXAAFGCOFU-UHFFFAOYSA-N ammonium hydrosulfide Chemical class [NH4+].[SH-] HIVLDXAAFGCOFU-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- UNTBPXHCXVWYOI-UHFFFAOYSA-O azanium;oxido(dioxo)vanadium Chemical compound [NH4+].[O-][V](=O)=O UNTBPXHCXVWYOI-UHFFFAOYSA-O 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- UBAZGMLMVVQSCD-UHFFFAOYSA-N carbon dioxide;molecular oxygen Chemical compound O=O.O=C=O UBAZGMLMVVQSCD-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003426 co-catalyst Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052976 metal sulfide Inorganic materials 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001868 water Inorganic materials 0.000 description 1
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- B01J29/26—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the mordenite type containing arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
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- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/10—After treatment, characterised by the effect to be obtained
- B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2370/00—Selection of materials for exhaust purification
- F01N2370/02—Selection of materials for exhaust purification used in catalytic reactors
- F01N2370/04—Zeolitic material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
Description
4NO+4NH3+O2→4N2+6H2O
2NO2+4NH3+O2→3N2+6H2O
NO+NO2+2NH3→2N2+3H2O
また、本発明は、低温領域の運転時だけに局限されず、高温領域の運転時にアンモニウム硫黄化合物により発生する非活性化にも耐久性が強い触媒を提供する。
上記排ガスの温度は180℃~400℃であることがよい。
上記SCR触媒は、三酸化タングステン(WO3)0.01~15重量%をさらに含むことができる。
上記ゼオライトのAl:Siの重量比が、1:5~1:50であることができる。
上記ゼオライトは、ゼオライト-Y、ZSM-5ゼオライト、AELゼオライト、AFIゼオライト、AFOゼオライト、AFRゼオライト、BEAゼオライト、HEUゼオライト、MFIゼオライト、MORゼオライト、MELゼオライト及びMTWゼオライトのうちから選択された1種以上であることができる。
上記SCR触媒は、240℃以上の温度範囲で再生されることができる。
本発明は、硫黄に対する耐久性に優れたSCR(Selective catalytic reduction:選択触媒還元)触媒に関するものである。
[反応式2]
SO2+1/2O2→SO3
SO3+H2O→H2SO4
2NH3+H2SO4→(NH4)2SO4
[反応式3]
NH3+SO3+H2O→(NH4)HSO4
(NH4)2SO4→(NH4)HSO4+NH3
本発明の一側面によると、排ガス中の窒素酸化物(NOx)を除去するためのSCR触媒において、5Å以上の平均気孔大きさを有するゼオライト(Zeolite)0.01~70重量%、二酸化チタン(TiO2)25~90重量%、及び五酸化バナジウム(V2O5)4~10重量%を含むSCR触媒が提供される。
また、本発明に係るSCR触媒は、SCR触媒の総重量を基に、五酸化バナジウム(V2O5)4~10重量%を含むことができ、4~7重量%を含むことが好ましい。4重量%未満の場合、活性成分であるV2O5量が少なく、脱窒(De-NOx)性能低下の問題があり、10重量%超過の場合、過剰のV2O5により活性金属の分散度が低くなって性能低下の問題がある。
上記ゼオライトの平均気孔大きさは5Å以上であることが好ましく、より詳細には、5Å~20Åであることが好ましい。ゼオライトの平均気孔大きさが5Å未満の場合、気孔の大きさが過度に小さく、触媒の非活性化を引き起こすAS、ABSなどが通過できず、硫黄に対する耐久性を確保することができない。
本発明の一実施例によると、上記ゼオライトは金属成分を含有しないゼオライトであることが好ましい。本発明において上記金属成分とは、鉄、コバルト、ニッケル、銅、クロム、亜鉛、マンガンなどを含む。金属成分を含むゼオライトでは、活性点である金属がSO2などと反応して、硫酸塩(sulfate)に非常に簡単に切り換えられる。一方、本発明では、金属成分が添加されていないゼオライトを使用することで、金属硫酸塩(metal sulfate)生成を防止し、ゼオライト性能が低くなる現象を防止し、また、SO2に起因した硫黄化合物(AS、ABSなど)を優先的に吸着してV2O5/TiO2が脱窒性能を維持するようにすることができる。
タングステンは酸化性能に優れて低温での触媒性能が向上するが、タングステンがSO2をSO3に酸化させるため、常用触媒の場合、タングステンの使用が多くない理由となる。すなわち、SCR触媒の非活性化に最も重要な被毒物質であるABSはSO3に起因するが、本発明では、生成されたABSがゼオライトに優先的に吸着されるため、V2O5/TiO2に被毒されず、性能が維持され、タングステンを含んでもSO2酸化の影響を受けず、低温性能の向上のみに寄与できるようにした。
上記排ガスの温度は180℃~400℃であることができる。言い換えると、本発明の触媒の作動温度が180℃~400℃である。一般的に、V2O5/TiO2系SCR触媒の作動温度は310~340℃や製鉄所の焼結工場や船舶などの排ガス後処理設備の場合などは、低温領域(200~250℃)で優れた性能が必要である。上述したとおり、本発明はABSなどが液状の形態で存在する180~280℃の領域で上記ABSなどがゼオライトの細孔に優先的に吸蔵されるため、SCR触媒活性を維持することができる。
(実施例)
1.V2O5含有量による窒素酸化物の転換率の評価
TiO2を支持体として使用し、シュウ酸(Oxalic acid)にメタバナジン酸アンモニウム(Ammonium metavanadate)を溶解した溶液を含浸させ、乾燥後、500℃で4時間焼成して、V2O54重量%及びTiO296重量%を含む触媒を製造した。
V2O5含有量を5重量%に制御したことを除いては、製造例1と同様の方法で触媒を製造した。
V2O5含有量を7重量%に制御したことを除いては、製造例1と同様の方法で触媒を製造した。
V2O5含有量を10重量%に制御したことを除いては、製造例1と同様の方法で触媒を製造した。
V2O5含有量を3重量%に制御したことを除いては、製造例1と同様の方法で触媒を製造した。
図2に示したとおり、3%V2O5を含有する比較製造例に係る触媒は、200~250℃の領域で20~70%の低い窒素酸化物の転換率を示すのに対し、V2O5含有量を上げると、200~250℃での窒素酸化物の転換率が増加し、製造例3の触媒では、200℃で75%、250℃で96%の高い窒素酸化物の転換率を示した。V2O5含有量をさらに増加して10%を超えると、却って、性能は低くなることが確認できる。
上記製造例3の触媒を用いて、耐硫黄性評価を行った。具体的には、ここで上記製造例3の触媒にWO37重量%を混合した触媒を比較例1、製造例3の触媒にWO37重量%及びZSM-5ゼオライトを総重量に対して30%混合して製造した触媒を実施例1、製造例3の触媒にWO37重量%及びシリカを総重量に対して30%混合して製造した触媒を比較例2と表示する。硫黄化合物に対する耐久性評価のための過程は、以下のとおりである。
比較例2の触媒は、比較例1の触媒と類似して非活性化の区間で性能低下があり、380℃再生後に性能が多少増加した。
上記硫黄化合物に対する耐久性評価に使用された比較例1(ゼオライトは含まず)及び実施例1(5Åの平均気孔大きさを有するゼオライトZSM-5を含む)の触媒以外に、製造例3の触媒に7Åの平均気孔大きさを有するゼオライトYを総重量に対して30%混合して製造した触媒を実施例2、製造例3の触媒に3.5Åの平均気孔大きさを有するCHAゼオライトを総重量に対して30%混合して製造した触媒を比較例3と表示し、上記と同様の方法でゼオライト平均気孔大きさによる硫黄化合物に対する耐久性の評価を行い、その結果を図4に示した。
様々なSi/Al含有量を有するYゼオライトを用いて、触媒を製造し、上記と同様の方法でゼオライトSi/Alの含有量による硫黄化合物に対する耐久性評価を行い、その結果を図5に示した。実施例3、4、及び比較例4、5の組成及びSi/Alの重量比は、以下のとおりである(実施例3:V2O5 3.5重量%、WO37重量%、TiO259.5重量%、Yゼオライト30重量%、Si/Al=5、実施例4:V2O5 3.5重量%、WO37重量%、TiO259.5重量%、Yゼオライト30重量%、Si/Al=12、比較例4:V2O5 3.5重量%、WO37重量%、TiO259.5重量%、シリカ30重量%、比較例5:V2O5 3.5重量%、WO37重量%、TiO259.5重量%、Yゼオライト30重量%、Si/Al=60)。
実施例2による触媒と常用触媒(V2O55重量%、TiO295重量%)を実際の製鉄焼結炉の排ガスを利用して耐久性を評価した。使用された触媒の大きさは150×150×600(横×縦×高さ)と、一般的に常用触媒単位のモジュール大きさで製作して評価した。焼結炉の運転環境によって排ガスの組成は異なる可能性があるが、一般的にNO160~250ppm、NH3250ppm、SO250~100ppm、O215%、CO26%、H2O10%及び様々な不純物が一部含まれている。触媒評価に使用された流量は、平均100Nm3/hであり、空間速度5500~6,000h-1の条件である。本発明の実施例2による触媒と常用触媒を利用して、下記表3のような条件で耐久性の評価を行い、その結果を図6に示した。
Claims (7)
- 排ガス中の窒素酸化物(NOx)を除去するためのSCR触媒において、
5Å以上の平均気孔大きさを有するゼオライト(Zeolite)0.01~70重量%、二酸化チタン(TiO2)25~90重量%、及び五酸化バナジウム(V2O5)4~10重量%を含み、
前記ゼオライトが鉄、コバルト、ニッケル、銅、クロム、亜鉛、マンガンを含む金属成分を含有せず、
前記ゼオライトのAl:Siの重量比が1:5~1:30であることを特徴とするSCR触媒。 - 前記排ガスが30ppm以上の硫黄化合物を含むことを特徴とする請求項1に記載のSCR触媒。
- 前記排ガスの温度が180℃~400℃であることを特徴とする請求項1又は2に記載のSCR触媒。
- 三酸化タングステン(WO3)0.01~15重量%をさらに含むことを特徴とする請求項1乃至3のいずれか1項に記載のSCR触媒。
- 前記ゼオライトがゼオライト-Y、ZSM-5ゼオライト、AELゼオライト、AFIゼオライト、AFOゼオライト、AFRゼオライト、BEAゼオライト、HEUゼオライト、MFIゼオライト、MORゼオライト、MELゼオライト及びMTWゼオライトのうち選択された1種以上であることを特徴とする請求項1乃至4のいずれか1項に記載のSCR触媒。
- 200~250℃の温度範囲で排ガス内の窒素酸化物の転換率が40~96%であることを特徴とする請求項1乃至5のいずれか1項に記載のSCR触媒。
- 前記SCR触媒は240℃以上の温度範囲で再生されることを特徴とする請求項1乃至6のいずれか1項に記載のSCR触媒。
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