2021 Fiscal Year Final Research Report
Development of Environmental Catalysts using Topotactic Transformation
| Project/Area Number |
19H02514
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 27030:Catalyst and resource chemical process-related
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| Research Institution | Kyoto Institute of Technology (2021)
Kyoto University (2019-2020) |
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Principal Investigator |
Hosokawa Saburo 京都工芸繊維大学, 材料化学系, 准教授 (90456806)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 環境触媒 / 酸素貯蔵材料 / ペロブスカイト酸化物 / トポタクティック反応 |
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| Outline of Final Research Achievements |
Environmental catalysts are used to remove harmful gases such as hydrocarbons and NOx species emitted from factories and automobiles, and it is desired to improve the catalytic activity owing to the ever-increasing concern over global warming. In addition, high thermal and chemical stability is essential for these materials because they are expected to be exposed to high temperatures and humidification. This study demonstrates an environmental catalyst that efficiently utilizes lattice oxygens and oxygen vacancy sites in perovskite oxides. We found that transition metal-doped SrTiO3 with high chemical stability exhibited excellent performances for NOx removal reactions.
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| Free Research Field |
触媒化学
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| Academic Significance and Societal Importance of the Research Achievements |
従来までの環境触媒材料設計では表面構造制御が主に検討されてきたが，本研究では固体内部の構造に主眼を置いて材料設計を試みた．その結果，NOx種を吸蔵させ除去する反応では，貴金属フリー型Mn添加SrTiO3のNOx吸蔵能は既存材料のPt/Ba/Al2O3に匹敵することを見出した．また，NOをN2に還元し除去する反応では，Co添加SrTiO3担持Pd触媒の格子酸素がNO還元に関与しており，本材料は既存材料であるPd/CeO2-ZrO2を凌駕する特性を示した．これらの成果は，貴金属使用量の低減化や代替に寄与するとともに，新しい触媒材料設計の指針になるものと考えている．
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