Development of high-field DNP surface enhanced NMR spectroscopy for metal oxide solid catalysts

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K15319
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 34020:Analytical chemistry-related
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Nagashima Hiroki 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 (00828098)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 固体NMR / 動的核偏極 / 金属酸化物 / 固体触媒

Outline of Final Research Achievements

The objective of this research is to develop a methodology for precisely analyzing the surface structure of solid catalysts composed of metal oxides by solid-state Dynamic Nuclear Polarization Nuclear Maganetic Resonance(DNP-NMR). In particular, we focused on the development of high-resolution NMR technique for quadrupolar nuclei by solid-state DNP-NMR, and succeeded in developing a new pulse sequence, D-RINEPT-MQMAS-QCPMG. We achieved the acquisition of DNP surface-enhanced 17O MQMAS spectra for samples of γ-alumina and ZnO nanocrystals that were labeled with 17O isotopes. The results of this research can be used widely for the analysis of the surface structures of metal oxide nanoparticles and porous materials.

Free Research Field

固体NMR

Academic Significance and Societal Importance of the Research Achievements

金属酸化物のナノ粒子や多孔質材料は現在あるいは将来の産業技術を発展させるキーマテリアル群である。本研究成果はこれらの表面構造を酸素を筆頭とした四極子核の固体NMR測定によって原子レベルで解析することが可能になる。これにより、精密な表面構造の設計の指針を得ることができるようになり、これらの固体ナノ材料の発展を促し、産業の課題や社会課題解決に貢献する。