2021 Fiscal Year Final Research Report
Synthesis of vanadium-tungsten complex oxides for deNOx catalysts
Project/Area Number |
20K15092
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Research Category |
Grant-in-Aid for Early-Career Scientists
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Allocation Type | Multi-year Fund |
Review Section |
Basic Section 27030:Catalyst and resource chemical process-related
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Research Institution | Kumamoto University |
Principal Investigator |
Inomata Yusuke 熊本大学, 大学院先端科学研究部(工), 助教 (40824024)
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Project Period (FY) |
2020-04-01 – 2022-03-31
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Keywords | 脱硝 / NOx / 酸化バナジウム / 酸化タングステン / 環境触媒 / 不均一触媒 |
Outline of Final Research Achievements |
NH3-SCR (selective catalytic reduction) is important process for conversion of harmful NOx to harmless N2 and H2O. However, the negative effect of water is critical for low-temperature NH3-SCR. In this work, we synthesized bulk W-substituted vanadium oxide catalysts for NH3-SCR at a low temperature and in the presence of water. Vanadium sites were atomically substituted by tungsten for 3.5 mol% W-substituted vanadium oxide. The 3.5mol% W-substituted vanadium oxide showed >99% (dry) and ~93% (wet, 5-20 vol% water) NO conversion at 150oC (250 ppm NO, 250 ppm NH3, 4% O2). Lewis acid sites of W-substituted vanadium oxide were converted to Bronsted acid sites under a wet condition while the distribution of Bronsted and Lewis acid sites did not change without tungsten. The high redox ability and reactivity of Bronsted acid sites were observed for bulk W-substituted vanadium oxide at a low temperature in the presence of water, and thus the catalytic cycle was less affected by water vapor.
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Free Research Field |
触媒材料
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Academic Significance and Societal Importance of the Research Achievements |
従来の脱硝触媒はその動作に300℃以上の高温が必要であった。本研究では100-150℃程度の低温でも十分なNO転化率を得られる触媒材料を実現した。これにより、従来脱硝触媒材料劣化の点で課題のあった脱硝プロセスで、触媒材料の高寿命化から触媒交換コストの抑制が期待される。学術面では、低温脱硝に求められる触媒材料の性質を反応機構解析から明らかにしたことで、脱硝触媒材料の開発の指針を明確化できた。
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