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Improvement of thermal stability of NO oxidation Pt/Al2O3 catalyst by addition of Pd

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タイトル: Improvement of thermal stability of NO oxidation Pt/Al2O3 catalyst by addition of Pd
著者: Kaneeda, M. 著作を一覧する
Iizuka, H. 著作を一覧する
Hiratsuka, T. 著作を一覧する
Shinotsuka, N. 著作を一覧する
Arai, M. 著作を一覧する
キーワード: Platinum
NO oxidation
Bimetallic catalyst
発行日: 2009年 8月17日
出版者: Elsevier B.V.
誌名: Applied Catalysis B : Environmental
巻: 90
号: 3-4
開始ページ: 564
終了ページ: 569
出版社 DOI: 10.1016/j.apcatb.2009.04.011
抄録: The present work has been undertaken to tailor Pt/Al2O3 catalysts active for NO oxidation even after severe heat treatments in air. For this purpose, the addition of Pd has been attempted, which is less active for this reaction but can effectively suppress thermal sintering of the active metal Pt. Various Pd-modified Pt/Al2O3 catalysts were prepared, subjected to heat treatments in air at 800℃ and 830℃, and then applied for NO oxidation at 300℃. The total NO oxidation activity was shown to be significantly enhanced by the addition of Pd, depending on the amount of Pd added. The Pd-modified catalysts are active even after the severe heat treatment at 830℃ for a long time of 60 h. The optimized Pd-modified Pt/Al2O3 catalyst can show a maximum activity limited by chemical equilibrium under the conditions used. The bulk structures of supported noble metal particles were examined by XRD and their surface properties by CO chemisorption and EDX-TEM. From these characterization results as well as the reaction ones, the size of individual metal particles, the chemical composition of their surfaces, and the overall TOF value were determined for discussing possible reasons for the improvement of the thermal stability and the enhanced catalytic activity of Pt/Al2O3 catalysts by the Pd addition. The Pd-modified Pt/Al2O3 catalysts should be a promising one for NO oxidation of practical interest.
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 荒井 正彦


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