Promotion of the performance of Cu-SSZ-13 for selective catalytic reduction of NOx by ammonia in the presence of SO2 during high temperature hydrothermal aging

Xin Yong, Cuijuan Zhang*, Miao Wei, Pingping Xie, Yongdan Li

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The influence of SO2 presence during high temperature hydrothermal aging (600, 700, and 800 °C) on the performance of Cu-SSZ-13 prepared by the conventional ion-exchange method for selective catalytic reduction of NOx by NH3 (NH3-SCR) was studied. The high-temperature activity of Cu-SSZ-13 is obviously enhanced by the SO2 presence for the 700 and 800 °C-aged samples and is not hampered for the 600 °C-aged sample. The presence of SO2 during hydrothermal aging has no influence on the framework Al. The interaction of Cu2+ with SO2 results in the formation of ZCuHSO4, which helps suppress the aggregation of Cu2+ into CuO and maintain more isolated Cu2+, leading to higher activity at high temperatures. The low Cu content yields higher relative population of Cu2+ species at more stable sites. The low-temperature (≤350 °C) activity is slightly lowered for the 600 and 700 °C-aged samples.

Original languageEnglish
Pages (from-to)228-235
Number of pages8
JournalJournal of Catalysis
Volume394
Early online date10 Jul 2020
DOIs
Publication statusPublished - Feb 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Cu-SSZ-13
  • Hydrothermal aging
  • NH-SCR
  • SO

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