Characterization and design of heteropoly acid catalysts using aberration-corrected transmission scanning electron microscopy

• Project/Area Number: 16K06863
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Catalyst/Resource chemical process
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Hiyoshi Norihito 国立研究開発法人産業技術総合研究所, 材料・化学領域, 主任研究員 (50415733)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2016: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: ヘテロポリ酸 / 電子顕微鏡 / 触媒 / ナノシート / ヘテロポリ酸触媒

Outline of Final Research Achievements

In this study, we succeeded in observing various heteropoly acid assemblies at the atomic level by aberration-corrected transmission scanning electron microscopy (STEM), and show that STEM can be used for characterization of solid heteropoly acid catalysts. In addition, to develop catalytic materials, we tried to control the arrangement of heteropoly acid molecules and succeeded in synthesizing novel Keggin-type heteropoly acid nanosheets. Furthermore, we succeeded in detailed structural analysis of the nanosheets using STEM.

Academic Significance and Societal Importance of the Research Achievements

へテロポリ酸分子の直接観察が可能となったことにより、固体ヘテロポリ酸触媒のより詳細な構造評価が可能となった。これにより、高効率な固体ヘテロポリ酸触媒の開発が加速されると期待できる。また、電子顕微鏡による直接観察は、ナノ材料の構造評価に特に有効である。本研究の成果によって、ヘテロポリ酸分子の配列を制御した新規なナノ材料の開発が加速されると期待できる。

Research Products

• [Journal Article] Keggin-type polyoxometalate nanosheets: synthesis and characterization via scanning transmission electron microscopy (2018)
  • Author(s): Norihito Hiyoshi
  • Journal Title: CHEMICAL COMMUNICATIONS Volume: 54 Issue: 41 Pages: 5217-5220
  • DOI: 10.1039/c8cc02978d
  • Peer Reviewed
• [Journal Article] Synthesis of epsilon-Keggin-Type Cobaltomolybdate-Based 3D Framework Material and Characterization Using Atomic-Scale HAADF-STEM and XANES (2017)
  • Author(s): Igarashi, T; Zhang, ZX; Haioka, T; Iseki, N; Hiyoshi, N; Sakaguchi, N; Kato, C; Nishihara, S; Inoue, K; Yamamoto, A; Yoshida, H; Tsunoji, N; Ueda, W; Sano, T; Sadakane, M
  • Journal Title: INORGANIC CHEMISTRY Volume: 56 Issue: 4 Pages: 2042-2049
  • DOI: 10.1021/acs.inorgchem.6b02748
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Encapsulation of two Potassium Cations in Preyssler-type Phosphotungstates: Preparation, Structural Characterization, Thermal Stability, Activity as an Acid Catalyst, and HAADF-STEM images (2016)
  • Author(s): Akio Hayashi, Hiromi Ota, Xavier Lopez, Norihito Hiyoshi, Nao Tsunoji, Tsuneji Sano, Masahiro Sadakane
  • Journal Title: Inorg. Chem. Volume: 55 Issue: 21 Pages: 11583-11592
  • DOI: 10.1021/acs.inorgchem.6b02116
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] 収差補正電子顕微鏡による触媒材料の構造観察 (2019)
  • Author(s): 日吉 範人
  • Organizer: 平成30年度石油学会東北支部講演会
  • Invited
• [Presentation] Keggin-type polyoxometalate nanosheets: synthesis and characterization using aberration-corrected transmission electron microscopy (2018)
  • Author(s): 日吉 範人
  • Organizer: 平成30年度化学系学協会東北大会
  • Invited
• [Patent(Industrial Property Rights)] ケギン型ヘテロポリ酸のアルカリ金属塩のナノシート及び粒子、並びにこれらの製造方法 (2017)
  • Inventor(s): 日吉 範人
  • Industrial Property Rights Holder: 産業技術総合研究所
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2017-196586
  • Filing Date: 2017