JP2005205280A - 排ガス浄化触媒及びその製造方法、並びに車用排ガス浄化触媒装置 - Google Patents
排ガス浄化触媒及びその製造方法、並びに車用排ガス浄化触媒装置 Download PDFInfo
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- JP2005205280A JP2005205280A JP2004012860A JP2004012860A JP2005205280A JP 2005205280 A JP2005205280 A JP 2005205280A JP 2004012860 A JP2004012860 A JP 2004012860A JP 2004012860 A JP2004012860 A JP 2004012860A JP 2005205280 A JP2005205280 A JP 2005205280A
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- exhaust gas
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- gas purification
- purification catalyst
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Images
Classifications
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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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- B01J23/14—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of germanium, tin or lead
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/32—Manganese, technetium or rhenium
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Abstract
【解決手段】Pdがペロブスカイト型Al複合酸化物に担持され、上記Al複合酸化物がLnAl1−XMXO3(Ln:希土類元素)であり、上記LnAl1−XMXO3中の元素Mが、1〜5族の元素及び12〜14族の元素うちの1種である。
【選択図】 なし
Description
<製造例1>
[担持担体複合酸化物の作製]
所定量の硝酸ランタン六水和物、硝酸マグネシウム、及び硝酸アルミニウム九水和物をイオン交換水に溶解し、混合水溶液を作製した。次に、所定量のリンゴ酸をイオン交換水に溶解し、リンゴ酸水溶液を作製した。この二つの水溶液を混合して、ホットプレートスターラにのせ、250℃で撹拌子を用いて撹拌しながら加熱し、水分蒸発の後、分解乾固させ、乾固物を乳鉢で粉砕した。これをアルミナ坩堝に移し、マッフル炉にて2.5℃/minで350℃まで昇温し、350℃で3時間熱処理を施した。これにより、リンゴ酸塩、硝酸根を除去した仮焼成体を作製した。仮焼成体を乳鉢で15分間粉砕混合した後、再びアルミナ坩堝に入れ、マッフル炉にて5℃/minで800℃まで昇温し、800℃で10時間熱処理を施した。これにより、LaAl0.8Mg0.2O3なる組成のペロブスカイト複合酸化物を作製した。
次に、所定量の硝酸パラジウム二水和物をイオン交換水に溶解させ、硝酸パラジウム水溶液を作製した。次いで、硝酸パラジウム水溶液と所定量のLaAlO3粉末とをナス型フラスコに入れ、ナス型フラスコをロータリーエバポレータで減圧しながら、60℃の湯浴中で蒸発乾固させた。その後、マッフル炉にて2.5℃/minで250℃まで昇温し、更に5℃/minで750℃まで昇温して、750℃で3時間保持した。これにより、PdOをLaAl0.8Mg0.2O3に含浸担持したPd/LaAl0.8Mg0.2O3なる製造例1の触媒粉末を得た。
次に、得られた製造例1の触媒粉末について、初期及び耐久処理後の活性評価を実施した。評価は、自動車のモデル排ガスを触媒に流通させ、A/F(空燃比)=14.6相当、SV(空間速度)=50000h−1にて行った。耐久処理は、A/F=14.6相当のモデル排ガスにより900℃の耐久温度で20時間行った。これらの結果を表1〜4に示す。即ち、表1には、初期の触媒の昇温試験における、CO、HC、NOの50%浄化温度を示す。また、表2には、初期の触媒の昇温試験における、400℃でのCO、HC、NOの浄化率を示す。さらに、表3には、耐久処理後の触媒の昇温試験における、CO、HC、NOの50%浄化温度を示す。加えて、表4には、耐久処理後の触媒の昇温試験における、400℃でのCO、HC、NOの浄化率を示す。
製造例1と同様の方法で、Pd/LaAl0.8Li0.2O3を製造し、各種活性評価を行った。その結果を表1〜4に併記する。
製造例1と同様の方法で、Pd/LaAl0.8Sc0.2O3を製造し、各種活性評価を行った。その結果を表1〜4に併記する。
製造例1と同様の方法で、Pd/LaAl0.8Ti0.2O3を製造し、各種活性評価を行った。その結果を表1〜4に併記する。
製造例1と同様の方法で、Pd/LaAl0.8Nb0.2O3を製造し、各種活性評価を行った。その結果を表1〜4に併記する。
製造例1と同様の方法で、Pd/LaAl0.8Zn0.2O3を製造し、各種活性評価を行った。その結果を表1〜4に併記する。
製造例1と同様の方法で、Pd/LaAl0.8Ga0.2O3を製造し、各種活性評価を行った。その結果を表1〜4に併記する。
製造例1と同様の方法で、Pd/LaAl0.8Ge0.2O3を製造し、各種活性評価を行った。その結果を表1〜4に併記する。
製造例1と同様の方法で、Pd/NdAl0.8Mg0.2O3を製造し、各種活性評価を行った。その結果を表1〜4に併記する。
製造例1と同様の方法で、Pd/Al2O3を製造し、各種活性評価を行った。その結果を表1〜4に併記する。
製造例1と同様の方法で、Pd/GdAl0.8Mg0.2O3を製造し、各種活性評価を行った。その結果を表1〜4に併記する。
製造例1と同様の方法で、Pd/LaAl0.8Mn0.2O3を製造し、各種活性評価を行った。その結果を表1〜4に併記する。
製造例1と同様の方法で、Pd/LaAl0.8Cu0.2O3を製造し、各種活性評価を行った。その結果を表1〜4に併記する。
所定量の酸化ランタン、炭酸マグネシウム、及び酸化アルミニウムをめのう乳鉢で混合し、アルミナ坩堝に入れ、マッフル炉にて1100℃で10時間焼成し、固相反応法によりLaAl0.8MgO3を作製した。これを用い、製造例1と同様の方法でPdを担持し、Pd/LaAl0.8MgO3を製造した。この触媒について、各種活性評価を行った。その結果を表1〜4に併記する。
Claims (9)
- Pdがペロブスカイト型Al複合酸化物に担持されている排ガス浄化触媒において、
前記Al複合酸化物がLnAl1−XMXO3(Ln:希土類元素)であり、前記LnAl1−XMXO3中の元素Mが、1〜5族の元素及び12〜14族の元素うちの1種であることを特徴とする排ガス浄化触媒。 - 前記LnAl1−XMXO3(Ln:希土類元素)中のXの範囲が、0.02〜0.3であることを特徴とする請求項1に記載の排ガス浄化触媒。
- 前記Al複合酸化物の結晶系が三方晶又は菱面体晶であることを特徴とする請求項1又は2に記載の排ガス浄化触媒。
- 化合物群(OH基又はSH基を有する炭素数2〜20のカルボン酸、炭素数2又は3のジカルボン酸、及び炭素数1〜20のモノカルボン酸)から選ばれた少なくとも1種を構成元素の硝酸塩水溶液又は塩化物水溶液に添加する工程を経て製造されたことを特徴とする請求項1〜3のいずれかに記載の排ガス浄化触媒。
- 前記硝酸塩水溶液又は塩化物水溶液を蒸発乾固させてカルボン酸錯体重合物を作製する工程と、前記カルボン酸錯体重合物を焼成する焼成工程とを経て製造されたことを特徴とする請求項4に記載の排ガス浄化触媒。
- PdがAl複合酸化物LnAl1−XMXO3(Ln:希土類元素)に担持されている排ガス浄化触媒を製造するにあたり、
化合物群(OH基又はSH基を有する炭素数2〜20のカルボン酸、炭素数2又は3のジカルボン酸、及び炭素数1〜20のモノカルボン酸)から選ばれる少なくとも1種を構成元素の硝酸塩水溶液又は塩化物水溶液に添加する工程を含むことを特徴とする排ガス浄化触媒の製造方法。 - 前記硝酸塩水溶液又は塩化物水溶液を蒸発乾固させてカルボン酸錯体重合物を作製する工程と、前記カルボン酸錯体重合物を焼成する焼成工程とを含むことを特徴とする請求項6に記載の排ガス浄化触媒の製造方法。
- 前記焼成工程における焼成温度が1000℃以下であることを特徴とする請求項7に記載の排ガス浄化触媒の製造方法。
- Pdがペロブスカイト型Al複合酸化物に担持されており、車から排出される排ガスを浄化する車用排ガス浄化触媒装置において、前記Al複合酸化物がLnAl1−XMXO3(Ln:希土類元素)であり、前記LnAl1−XMXO3中の元素Mが、1〜5族の元素及び12〜14族の元素うちの1種であることを特徴とする車用排ガス浄化触媒装置。
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2008091004A1 (ja) | 2007-01-24 | 2008-07-31 | Nippon Steel Materials Co., Ltd. | 排ガス浄化用触媒及び排ガス浄化用ハニカム触媒構造体 |
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US20050187099A1 (en) | 2005-08-25 |
DE102005002784A1 (de) | 2005-08-18 |
US7199079B2 (en) | 2007-04-03 |
CN1669645A (zh) | 2005-09-21 |
JP4204487B2 (ja) | 2009-01-07 |
US20070155623A1 (en) | 2007-07-05 |
US7476640B2 (en) | 2009-01-13 |
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