| 학회 |
한국공업화학회 |
| 학술대회 |
2021년 봄 (05/12 ~ 05/14, 부산 벡스코(BEXCO)) |
| 권호 |
25권 1호 |
| 발표분야 |
포스터-촉매 |
| 제목 |
Understanding the dynamic behavior of acid sites on TiO2-supported vanadia catalysts via operando DRIFTS under SCR-relevant conditions |
| 초록 |
The mechanisms of the selective catalytic reduction of NO with NH3 are under debate, in terms of the participation of Brønsted and Lewis acid sites on V2O5/TiO2 catalyst. Our results elucidated dynamic nature of transformation between Brønsted and Lewis sites on V2O5/TiO2 occurring in SCR-relevant conditions through a series of operando DRIFTS experiments. The reversible change between two acid sites occurred by hydration in the presence of water and changing redox state of the catalyst. Under reducing conditions, the reduced vanadium sites coordinated with ammonia to serve as additional Lewis acid sites; the reducing environment enriched the surface with Lewis sites, while the oxidizing environment gave the catalyst surface more Brønsted sites. These results suggested that the equilibria between two acid sites differ depending on the reactants contained in reaction gas. The instantaneous change of the gaseous environment resulted in redistribution of ammonia on both acid sites. |
| 저자 |
전세원, 송인학, 이황호, 김도희
|
| 소속 |
서울대 |
| 키워드 |
NH3-SCR; Catalysis; V2O5/TiO2
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| E-Mail |
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