Vanadium in strongly correlated electron system Ni1-xVxWO4: Paradoxically boosted deNOx reaction under SOx environment via modulating electron correlation
- Authors
- Suh, June Won; Park, Jihye; Jeong, Si Hoon; Park, Gi Hyun; Choi, Myung Sik; Jin, Changhyun; Lee, Jung-Woo; Lee, Kimoon; Jeong, Bo Ra; Kim, Hong-Dae; Kim, Sun-Dong; Kim, Hak Joo; Kim, Sung Eun; Ji, Yunseong; Lee, Hyesung; Bang, Joonho; Lee, Kyu Hyoung; Lee, Seung Yong
- Issue Date
- Apr-2024
- Publisher
- Elsevier B.V.
- Keywords
- Denitration; Ni<sub>1−x</sub>V<sub>x</sub>WO<sub>4</sub>; Selective catalytic reduction; SO<sub>x</sub> tolerance; Strongly correlated electron system
- Citation
- Applied Catalysis B: Environmental, v.343
- Journal Title
- Applied Catalysis B: Environmental
- Volume
- 343
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/32682
- DOI
- 10.1016/j.apcatb.2023.123540
- ISSN
- 0926-3373
1873-3883
- Abstract
- The persistent challenge of NOx selective catalytic reduction degradation in the presence of SOx has remained unresolved for decades. In this study, we report a paradoxical boosted denitration performance more than 20% under the SOx environment through controlling the charge state of V utilizing strongly correlated electron systems (SCES) in Ni1−xVxWO4. Substitutional doped V at the Ni site, and the computed charge gap from DFT confirms the SCES. Through the manipulation of the strong correlation between V and Ni, V preserves the between + 2–3 charge state in the presence of SOx. Furthermore, we achieved a stable oxidation/reduction cycle and higher denitration efficiency by altering the oxidation point of (NH4)HSO4-contaminated Ni1−xVxWO4. This results from deliberate decrease in Coulombic repulsion between Ni and V, improving electron transfer for catalytic performance. This revelation offers a resolution of exceptional denitration performance within SOx in industrial exhaust systems, exploiting the foundational principles of SCES. © 2023 Elsevier B.V.
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