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 language | English |
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Pages (from-to) | 228-235 |
Number of pages | 8 |
Journal | Journal of Catalysis |
Volume | 394 |
Early online date | 10 Jul 2020 |
DOIs | |
Publication status | Published - Feb 2021 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Cu-SSZ-13
- Hydrothermal aging
- NH-SCR
- SO