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Deactivation and Regeneration for the SO2-Poisoning of a Cu-SSZ-13 Catalyst in the NH3-SCR Reaction

by Yan Wang 1,2,3, Zhaoqiang Li 1,2,3,*, Rongrong Fan 1,2,3, Xin Guo 1,2,3, Cheng Zhang 1,2,3, Yu Wang 1,2,3, Zhiyong Ding 1,2,3, Rong Wang 1,2,3,* and Wei Liu 1,2,3
1
Baotou Research Institute of Rare Earths, Baotou 014030, China
2
National Engineering Research of Rare Earth Metallurgy and Functional Materials, Baotou 014030, China
3
State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou 014030, China
*
Authors to whom correspondence should be addressed.
Catalysts 2019, 9(10), 797; https://doi.org/10.3390/catal9100797
Received: 4 September 2019 / Revised: 21 September 2019 / Accepted: 21 September 2019 / Published: 24 September 2019
Cu-SSZ-13 has been generally considered as the predominant commercial selective catalytic reduction (SCR) catalyst in the NH3-SCR reaction because of its superior activity and durability. However, in real applications, SCR catalysts readily undergo hydrothermal aging and sulfur poisoning. In this work, the deactivation and regeneration of a commercial Cu-SSZ-13 catalyst was investigated for SO2 exposures during hydrothermal aging and the effect of different regeneration temperatures was compared. By using XRD, SEM, H2-temperature programmed reduction (TPR), X–ray photoelectron spectra (XPS) and NH3-temperature programmed desorption (TPD) analysis, it was found that SO2 poisoning influenced the chabazite (CHA) structure even if regeneration cannot restore its original structure, the redox ability and ammonia storage performance also influenced by sulfation and the regeneration process. Moreover, the extent of a decrease in redox ability was more severe than acidity, suggesting that the amount of isolated Cu2+ and Cu+ reduction was responsible for irreversible deactivation over the Cu-SSZ-13 catalyst. Combined with the analysis of Ea values and pre-exponential factor of the SCR reaction, a more likely explanation for the irreversible deactivation was that active sites were lost mostly in sulfated and regenerated process sites. View Full-Text
Keywords: Cu-SSZ-13; SCR; sulfur poisoning; hydrothermal aging; regeneration Cu-SSZ-13; SCR; sulfur poisoning; hydrothermal aging; regeneration
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Wang, Y.; Li, Z.; Fan, R.; Guo, X.; Zhang, C.; Wang, Y.; Ding, Z.; Wang, R.; Liu, W. Deactivation and Regeneration for the SO2-Poisoning of a Cu-SSZ-13 Catalyst in the NH3-SCR Reaction. Catalysts 2019, 9, 797.

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