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Vanadium in strongly correlated electron system Ni1-xVxWO4: Paradoxically boosted deNOx reaction under SOx environment via modulating electron correlation

Authors
Suh, June WonPark, JihyeJeong, Si HoonPark, Gi HyunChoi, Myung SikJin, ChanghyunLee, Jung-WooLee, KimoonJeong, Bo RaKim, Hong-DaeKim, Sun-DongKim, Hak JooKim, Sung EunJi, YunseongLee, HyesungBang, JoonhoLee, Kyu HyoungLee, 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
Indexed
SCOPUS
Journal Title
Applied Catalysis B: Environmental
Volume
343
URI
https://scholarworks.gnu.ac.kr/handle/sw.gnu/68813
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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