TY - JOUR
T1 - Extraordinary deactivation offset effect of zinc and arsenic on V2O5 −WO3/TiO2 catalysts
T2 - Like cures like
AU - Jiang, Si
AU - Li, Xiang
AU - Yin, Yong
AU - Luo, Bingcheng
AU - Isah, Abdulrasheed Gambo
AU - Zhang, Zili
AU - Zhu, Tianle
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/1/5
Y1 - 2023/1/5
N2 - The commercial V2O5 −WO3/TiO2 (VWTi) catalysts often suffer from a serious joint deactivation by multiple heavy metals in the flue gas for NOx removal by NH3-SCR. Herein, we report an extraordinary deactivation offset effect between Zn and As on VWTi with alleviation of the toxic effects of the heavy metals by “like cures like”. With the As&Zn content of 4 wt%, VWTi-As&Zn exhibited over 97% NO conversion under a GHSV of 100,000 h−1 and good SO2/H2O tolerance (> 93% NO conversion). It's presented 85% of fresh VWTi, exceeding those of VWTi-Zn (15%) by 5.6-fold and VWTi-As (70%) by 1.2-fold. Structure analysis showed that, unlike VWTi-As and VWTi-Zn, the V[dbnd]O vibration and dispersion state of VOx sites over VWTi-As&Zn were hardly affected. Moreover, VWTi-As&Zn possessed both the Lewis and Brønsted acid sites while VWTi-Zn and VWTi-As had only one type of them. The operando infrared/Raman/UV–vis spectroscopy and DFT calculations verified that the less affected VOx sites mainly reflected in three aspects: 1) the electron interaction between As and Zn; 2) the active V[dbnd]O Lewis acid sites; 3) lower energy barrier for N − H bond breaking. The “like cures like” phenomenon may open up an innovative pathway for the control of hazardous heavy metals.
AB - The commercial V2O5 −WO3/TiO2 (VWTi) catalysts often suffer from a serious joint deactivation by multiple heavy metals in the flue gas for NOx removal by NH3-SCR. Herein, we report an extraordinary deactivation offset effect between Zn and As on VWTi with alleviation of the toxic effects of the heavy metals by “like cures like”. With the As&Zn content of 4 wt%, VWTi-As&Zn exhibited over 97% NO conversion under a GHSV of 100,000 h−1 and good SO2/H2O tolerance (> 93% NO conversion). It's presented 85% of fresh VWTi, exceeding those of VWTi-Zn (15%) by 5.6-fold and VWTi-As (70%) by 1.2-fold. Structure analysis showed that, unlike VWTi-As and VWTi-Zn, the V[dbnd]O vibration and dispersion state of VOx sites over VWTi-As&Zn were hardly affected. Moreover, VWTi-As&Zn possessed both the Lewis and Brønsted acid sites while VWTi-Zn and VWTi-As had only one type of them. The operando infrared/Raman/UV–vis spectroscopy and DFT calculations verified that the less affected VOx sites mainly reflected in three aspects: 1) the electron interaction between As and Zn; 2) the active V[dbnd]O Lewis acid sites; 3) lower energy barrier for N − H bond breaking. The “like cures like” phenomenon may open up an innovative pathway for the control of hazardous heavy metals.
KW - Arsenic and zinc
KW - DFT calculations
KW - Like cures like
KW - Operando spectroscopy
KW - Selective catalytic reduction
UR - https://www.scopus.com/pages/publications/85137301573
U2 - 10.1016/j.jhazmat.2022.129894
DO - 10.1016/j.jhazmat.2022.129894
M3 - 文章
C2 - 36087534
AN - SCOPUS:85137301573
SN - 0304-3894
VL - 441
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 129894
ER -