In situ XAFS analysis of deactivation mechanism of combustion catalysts for gas sensors

• Project/Area Number: 23750225
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Functional materials/Devices
• Research Institution: Kyushu University
• Principal Investigator: NISHIBORI Maiko 九州大学, 大学院・総合理工学研究院, 准教授 (20462848)
• Project Period (FY): 2011 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2012: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2011: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 導電機能素子 / 化学センサ / ガスセンサ / 触媒 / 被毒 / in situ XAFS / 集積化

Research Abstract

The deactivation mechanism of Pd/・-alumina catalysts for gas sensor by hexamethyldisiloxane (HMDSO) exposure has been investigated. The chemical state and local structure of Pd in the catalysts has been characterized under the reduction and oxidation conditions after HMDSO exposure by in situ X-ray absorption fine structure (XAFS) measurement. The Pd/・-alumina catalyst after HMDSO exposure hardly changed the chemical state of Pd even under the O2/N2atmosphere though it oxidized easily under the O2/N2atmosphere at the temperature of 300℃. This result shows thatthe Pd of the catalyst existed as the metal under the oxidizingcondition after the HMDSO exposure. It suggests that the contact between Pd site and gases was inhibited by the adsorption of the substance derived from HMDSO on the catalytic surface.

Research Products

• [Journal Article] CO oxidation performance of Au/Co_3 O_4 catalyst on the micro gas sensor device (2013)
  • Author(s): M. Nishibori, W. Shin, N. Izu, T. Itoh, I. Matsubara
  • Journal Title: Catalysis Today Volume: vol.201 Pages: 85-91
  • Peer Reviewed
• [Presentation] (BuNH_3)xMoO_3 ハイブリッドセンサのVOC応答機構の検討 (2012)
  • Author(s): 西堀麻衣子、寺岡靖剛、松原一郎、申ウソク
  • Organizer: 日本セラミックス協会第25回秋季シンポジウム
  • Place of Presentation: 名古屋
  • Year and Date: 2012-09-19
• [Presentation] Deactivation mechanism of alumina supported Pt and Pd catalysts for gas sensor by hexamethyldisiloxane (HMDSO) (2012)
  • Author(s): M. Nishibori, K. Katoh, T. Itoh, N. Izu, W. Shin
  • Organizer: The 14 th International Meeting on Chemical Sensors
  • Place of Presentation: Germany
  • Year and Date: 2012-05-20
• [Presentation] In situ XAFSによる有機/MoO3センサのVOC応答機構の解明 (2012)
  • Author(s): 西堀麻衣子、松原一郎、伊藤敏雄、申ウソク
  • Organizer: 第25回日本放射光学会年会・放射光科学合同シンポジウム
  • Place of Presentation: 鳥栖
  • Year and Date: 2012-01-08
• [Presentation] (BuNH3)xMoO3ハイブリッドセンサのVOC応答機構の検討 (2012)
  • Author(s): 西堀麻衣子、寺岡靖剛、松原一郎、申ウソク
  • Organizer: 日本セラミックス協会第25回秋季シンポジウム
  • Place of Presentation: 名古屋大学
• [Presentation] In situ XAFSによる有機/MoO3センサのVOC応答機構の解明 (2012)
  • Author(s): 西堀麻衣子、松原一郎、伊藤敏雄、申ウソク
  • Organizer: 第25回日本放射光学会年会・放射光科学合同シンポジウム
  • Place of Presentation: 鳥栖市民文化会館・中央公民館（鳥栖）
• [Presentation] In situ XAFSによる有機/酸化モリブデンセンサのVOC吸着応答機構の解明 (2011)
  • Author(s): 西堀麻衣子、松原一郎、伊藤敏雄、申ウソク
  • Organizer: 第25回日本吸着学会研究発表会
  • Place of Presentation: 那覇
  • Year and Date: 2011-11-11
• [Presentation] In situ XAFSによる有機/酸化モリブデンセンサのVOC吸着応答機構の解明 (2011)
  • Author(s): 西堀麻衣子、松原一郎、伊藤敏雄、申ウソク
  • Organizer: 第25回日本吸着学会研究発表会
  • Place of Presentation: 那覇産業支援センター（那覇）