In Situ and Simultaneous Observation of Palladium Redox and Oxygen Storage/Release in Pd/Sr-Fe-O Perovskite Catalysts Using Dispersive XAFS

• Kimura Masao

  Advanced Technology Research Laboratories, Nippon Steel Corporation

• Niwa Yasuhiro

  Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)

• Uemura Kenichi

  Advanced Technology Research Laboratories, Nippon Steel Corporation

• Nagai Toru

  Advanced Technology Research Laboratories, Nippon Steel Corporation

• Inada Yasuhiro

  Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)

• Nomura Masaharu

  Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)

書誌事項

タイトル別名

• <i>In Situ</i> and Simultaneous Observation of Palladium Redox and Oxygen Storage/Release in Pd/Sr–Fe–O Perovskite Catalysts Using Dispersive XAFS
• <i>In Situ</i> and Simultaneous Observation of Palladium Redox and Oxygen Storage/Release in Pd/Sr&ndash;Fe&ndash;O Perovskite Catalysts Using Dispersive XAFS

抄録

We have succeeded in in situ and simultaneously observing the redox reaction of palladium and the oxygen storage/release process in a newly developed palladium-promoted Sr–Fe–O (Pd/Sr–Fe–O) catalyst during redox-gas cycles using dispersive X-ray absorption fine structure (XAFS) analysis at 673 K with a time resolution of less than 20 ms. The Pd/Sr–Fe–O catalyst, which exhibits high performance for automotive emission control, has a unique “multi-phase-domain” structure, where a single grain is composed of nano-sized domains of three phases: SrFeO_3−δ, Sr₄Fe₆O_13−δ and SrFe₁₂O_19−δ. In situ observation has shown a strong correlation between the redox of the palladium and the oxygen storage/release in the Pd/Sr–Fe–O catalyst, and the correlation factors differ between the reduction and oxidation reactions. The oxide phases exhibit a type of “oxygen buffer” effect in the oxidation cycle and delay the formation of Pd–O, resulting in the high performance of the catalyst.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 54 (2), 246-254, 2013

  公益社団法人 日本金属学会

キーワード

• perovskite
• palladium
• X-ray absorption fine structure (XAFS)
• kinetics
• time-resolved
• redox

詳細情報

• CRID: 1390282679225652992
• NII論文ID: 10031144489
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.m2012297
• COI: 1:CAS:528:DC%2BC3sXltVKqtLY%3D
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 024231931
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I024231931
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/54/2/54_M2012297/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可