Oxidation Catalysts Using Oxide Ion and Electron Migration in the Solid

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02435
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26020:Inorganic materials and properties-related
• Research Institution: Osaka University
• Principal Investigator: Imanaka Nobuhito 大阪大学, 工学研究科, 教授 (30192503)
• Co-Investigator(Kenkyū-buntansha): 布谷 直義 大阪大学, 工学研究科, 助教 (40715314)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 酸化触媒 / 環境触媒 / イオン伝導 / 電子伝導 / トルエン / フェノール類 / グリセリン / 希土類

Outline of Final Research Achievements

Novel oxidation catalysts were prepared by artificial control of oxide ion and electron migration property in the solid. Smooth oxide ion conduction and the high redox property increased the oxygen release and storage abilities, which facilitated the catalytic oxidation. Oxide ion conducting property was controlled by selecting the crystal structure suitable for oxide ion migration and introducing oxide ion vacancies in the lattice. Electron conductivity (redox property) was provided by doping ions which can change their valence state. As results, the Pt/La10Si5CoO27-δ/γ-Al2O3 catalyst can completely oxidize toluene in gas-phase at 120℃, and the Pt/CeO2-ZrO2-SnO2/ZrO2/SBA-16 catalyst can completely remove phenol in liquid-phase under the moderate conditions at 80℃ under the atmospheric open-air system. Furthermore, glycerol can be oxidized to value-added compounds by using the CeO2-ZrO2-based systems.

Free Research Field

無機材料化学

Academic Significance and Societal Importance of the Research Achievements

本研究では、環境汚染の原因となる有害有機化合物を効率的に酸化分解するため、イオン伝導および電子伝導という新しい観点を取り入れた新規触媒を創成した。その結果、気相中のトルエンを120℃で完全燃焼、また液相中のフェノール類を常圧大気開放下80℃で完全浄化できる触媒を実現した。さらに、近年供給過剰となっているグリセリンを高付加価値化合物（グリセルアルデヒド、グリセリン酸、ジヒドロキシアセトン、ヒドロキシピルビン酸）へと変換できる触媒も創成した。