JPWO2009139088A1 - 窒素酸化物浄化用触媒 - Google Patents
窒素酸化物浄化用触媒 Download PDFInfo
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Abstract
Description
実施例1
100質量部のβゼオライト、67質量部のTiO2ゾル(TiO2濃度30質量%)、100質量部のSiO2系バインダー(SiO2濃度50質量%)及び200質量部の純水をボールミルで混合してスラリーを得た。このスラリーをモデルガス評価用のコージェライト製担体(φ25.4mm、L20mm、400セル)に、βゼオライトの担持量が100g/Lとなり、TiO2の担持量が20g/Lとなるようにコートし、乾燥させ、500℃で焼成した。次いで、硝酸セリウム、硝酸鉄及び純水からなる水溶液中に浸漬して含浸させ、水溶液から取り出した後、乾燥させ、500℃で焼成して窒素酸化物浄化用触媒を得た。この時のCeO2の担持量が20g/Lとなり、Feの担持量が10g/Lとなるように調整した。
硝酸セリウム、硝酸鉄及び純水からなる水溶液の代わりに、硝酸セリウム及び純水からなる水溶液を用いた以外は実施例1と同様に処理して窒素酸化物浄化用触媒を得た。この時のβゼオライトの担持量が100g/Lとなり、TiO2の担持量が20g/Lとなり、CeO2の担持量が20g/Lとなるように調整した。
100質量部のβゼオライト、100質量部のSiO2系バインダー(SiO2濃度50質量%)及び200質量部の純水をボールミルで混合してスラリーを得た。このスラリーをモデルガス評価用のコージェライト製担体(φ25.4mm、L20mm、400セル)にβゼオライトの担持量が100g/Lとなるようにコートし、乾燥させ、500℃で焼成した。次いで、硝酸鉄及び純水からなる水溶液中に浸漬して含浸させ、水溶液から取り出した後、乾燥させ、500℃で焼成して窒素酸化物浄化用触媒を得た。この時のFeの担持量が10g/Lとなるように調整した。
実施例1、実施例2及び比較例1で得た各々の窒素酸化物浄化用触媒を評価装置に充填し、下記の第1表に示す組成の排気モデルガスを空間速度50000/hで流通させながら、20℃/分の昇温速度で400℃まで昇温させ、NOの浄化率を測定した。400℃におけるモデルガスの浄化率(%)は第2表に示す通りであった。
100質量部のβゼオライト、67質量部のTiO2ゾル(TiO2濃度30質量%)、50質量部の硝酸セリウム、100質量部のSiO2系バインダー(SiO2濃度50質量%)及び200質量部の純水をボールミルで混合してスラリーを得た。このスラリーをモデルガス評価用のコージェライト製担体(φ25.4mm、L20mm、400セル)に、βゼオライトの担持量が100g/Lとなり、TiO2の担持量が20g/Lとなり、CeO2の担持量が20g/Lとなるようにコートし、乾燥させ、500℃で焼成した。次いで、硝酸鉄及び純水からなる水溶液中に浸漬して含浸させ、水溶液から取り出した後、乾燥させ、500℃で焼成して窒素酸化物浄化用触媒を得た。この時のFeの担持量が10g/Lとなるように調整した。
100質量部のβゼオライト、67質量部のTiO2ゾル(TiO2濃度30質量%)、50質量部の硝酸セリウム、72質量部の硝酸鉄、100質量部のSiO2系バインダー(SiO2濃度50質量%)及び200質量部の純水をボールミルで混合してスラリーを得た。このスラリーをモデルガス評価用のコージェライト製担体(φ25.4mm、L20mm、400セル)に、βゼオライトの担持量が100g/Lとなり、TiO2の担持量が20g/Lとなり、CeO2の担持量が20g/Lとなり、Feの担持量が10g/Lとなるようにコートし、乾燥させ、500℃で焼成して窒素酸化物浄化用触媒を得た。
硝酸鉄水溶液中にβゼオライトを投入し、蒸発乾固法により鉄を9質量%担持したβゼオライト(粉末A)を得た。また、アンモニア水溶液にTiO2ゾルを添加し、次いで硝酸セリウムを添加し、ろ過し、乾燥させ、500℃で焼成してCeO2−TiO2複合酸化物(粉末B)を得た。この場合にCeO2とTiO2との質量比が1:1となるように調整した。粉末A、粉末B、SiO2系バインダー及び純水をボールミルで混合してスラリーを得た。このスラリーをモデルガス評価用のコージェライト製担体(φ25.4mm、L20mm、400セル)に、βゼオライトの担持量が100g/Lとなり、TiO2の担持量が20g/Lとなり、CeO2の担持量が20g/Lとなり、Feの担持量が10g/Lとなるようにコートし、乾燥させ、500℃で焼成して窒素酸化物浄化用触媒を得た。
実施例3、実施例4及び比較例2で得た各々の窒素酸化物浄化用触媒を評価装置に充填し、上記の第1表に示す組成の排気モデルガスを空間速度50000/hで流通させながら、20℃/分の昇温速度で400℃まで昇温させ、NOの浄化率を測定した。400℃におけるモデルガスの浄化率(%)は第3表に示す通りであった。
Claims (6)
- 希土類金属の酸化物を担持したβゼオライトと希土類金属の酸化物を担持した二酸化チタンとからなることを特徴とする窒素酸化物浄化用触媒。
- 希土類金属の酸化物及び鉄の酸化物又は水酸化物を担持したβゼオライトと希土類金属の酸化物及び鉄の酸化物又は水酸化物を担持した二酸化チタンとからなることを特徴とする窒素酸化物浄化用触媒。
- セラミックス又は金属材料からなる担体と、該担体上に担持されている請求項1記載の窒素酸化物浄化用触媒の層とからなることを特徴とする窒素酸化物浄化用触媒。
- βゼオライトの担持量が60〜300g/Lであり、二酸化チタンの担持量が1〜100g/Lであり、希土類金属の酸化物の担持量が1〜100g/Lであることを特徴とする請求項3記載の窒素酸化物浄化用触媒。
- セラミックス又は金属材料からなる担体と、該担体上に担持されている請求項2記載の窒素酸化物浄化用触媒の層とからなることを特徴とする窒素酸化物浄化用触媒。
- βゼオライトの担持量が60〜300g/Lであり、二酸化チタンの担持量が1〜100g/Lであり、希土類金属の酸化物の担持量が1〜100g/Lであり、鉄の酸化物又は水酸化物の担持量が鉄の量として1〜50g/Lであることを特徴とする請求項5記載の窒素酸化物浄化用触媒。
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US (1) | US8551901B2 (ja) |
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CN (1) | CN102026722B (ja) |
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EP2771111A1 (en) * | 2011-10-24 | 2014-09-03 | Haldor Topsøe A/S | Catalyst composition and method for use in selective catalytic reduction of nitrogen oxides |
WO2013182255A1 (en) * | 2012-06-06 | 2013-12-12 | Haldor Topsøe A/S | Scr catalyst and method of preparation thereof |
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