JP3843092B2 - 排ガス浄化触媒およびその製造方法、ならびに車用排ガス浄化触媒装置 - Google Patents
排ガス浄化触媒およびその製造方法、ならびに車用排ガス浄化触媒装置 Download PDFInfo
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- 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
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Catalysts (AREA)
- Exhaust Gas After Treatment (AREA)
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、硝酸カルシウム、およ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、La0.8Ca0.2AlO3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La 0.8 Ca 0.2 AlO 3 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、さらに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La0.8Ca0.2AlO3に含浸担持したPd/La0.8Ca0.2AlO3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、初期およ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(流量)=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1,2に示す。すなわち、表1には、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、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。
製造例1と同様の方法で、Pd/La0.8Sr0.2AlO3を製造し、各種活性評価を行った。その結果を表1,2に併記する。
製造例1と同様の方法で、Pd/La0.8Ba0.2AlO3を製造し、各種活性評価を行った。その結果を表1,2に併記する。
製造例1と同様の方法で、Pd/La0.98Sr0.02AlO3を製造し、各種活性評価を行った。その結果を表1,2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1,2に併記する。
製造例1と同様の方法で、Pd/La0.8Ca0.2NiO3を製造し、各種活性評価を行った。その結果を表1,2に併記する。なお、La0.8Ca0.2NiO3の結晶系は三方晶である。
製造例1と同様の方法で、Pd/La0.8Ca0.2MnO3を製造し、各種活性評価を行った。その結果を表1,2に併記する。なお、La0.8Ca0.2MnO3の結晶系は斜方晶である。
製造例1と同様の方法で、Pd/La0.8Ca0.2CoO3を製造し、各種活性評価を行った。その結果を表1,2に併記する。なお、La0.8Ca0.2CoO3の結晶系は斜方晶である。
製造例1と同様の方法で、Pd/La0.8Ca0.2FeO3を製造し、各種活性評価を行った。その結果を表1,2に併記する。なお、La0.8Ca0.2FeO3の結晶系は斜方晶である。
Claims (7)
- Pdが希土類系Al酸化物に担持されている排ガス浄化触媒において、
前記希土類系Al酸化物は、Ln 1−X M X AlO 3 (Ln:希土類元素、M:アルカリ土類金属、Xは0を超え1未満)であり、かつ、その結晶系が三方晶または菱面体晶であることを特徴とする排ガス浄化触媒。 - 化合物群(OH基またはSH基を有する炭素数2〜20のカルボン酸、炭素数2または3のジカルボン酸、および炭素数1〜20のモノカルボン酸)から選ばれた少なくとも1種を前記Ln,MおよびAlの硝酸塩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に記載の排ガス浄化触媒。
- 前記硝酸塩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2に記載の排ガス浄化触媒。
- Pdが、Ln1−XMXAlO3(Ln:希土類元素、M:アルカリ土類金属、Xは0を超え1未満)であってその結晶系が三方晶または菱面体晶のもの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基またはSH基を有する炭素数2〜20のカルボン酸、炭素数2または3のジカルボン酸、および炭素数1〜20のモノカルボン酸)から選ばれる少なくとも1種を前記Ln,MおよびAlの硝酸塩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4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5に記載の排ガス浄化触媒の製造方法。
- Pdが希土類系Al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、前記希土類系Al酸化物は、Ln 1−X M X AlO 3 (Ln:希土類元素、M:アルカリ土類金属、Xは0を超え1未満)であり、かつ、その結晶系が三方晶または菱面体晶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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