Insight into SO2 poisoning and regeneration of one-pot synthesized Cu-SSZ-13 catalyst for selective reduction of NOx by NH3

Xin Yong, Hong Chen*, Huawang Zhao, Miao Wei, Yingnan Zhao, Yongdan Li*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

The effects of SO2 on an one-pot synthesized Cu-SSZ-13 catalyst for selective reduction of NOx by NH3 were examined. The addition of SO2 inhibited NOx conversion significantly below 300 °C, while no effect on NOx conversion was observed above 300 °C. TGA, TPD, and XPS results showed that the deactivation was caused by the formation of (NH4)2SO4, SO2 chemisorption on the isolated Cu2+ ion sites, as well as the formation of CuSO4-like species. Among them, the site-blocking effect of (NH4)2SO4 on Cu2+ was the primary reason for deactivation. Fortunately, 89% of deNOx activity of the poisoned catalyst was recovered after thermal treatment at 500 °C in air, where (NH4)2SO4 was completely decomposed. The activity was further recovered with regeneration temperature increasing to 600 °C, removing the adsorbed SO2 on the Cu2+ sites. The regeneration at 600 °C could not recover the activity completely, because of the high stability of CuSO4-like species.

Original languageEnglish
Pages (from-to)184-193
Number of pages10
JournalChinese Journal of Chemical Engineering
Volume46
DOIs
Publication statusPublished - Jun 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Activity regeneration
  • Emission control
  • One-pot synthesis of Cu-SSZ-13
  • SCR
  • SO poisoning

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