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 NO_x 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.

SO的影响₂存在高温水热老化过程中对Cu-SSZ-13由对NO的选择性催化还原的常规离子交换法制备的性能（600，700，和800℃）_X由NH ₃（NH_研究了3- SCR）。在700和800°C时效的样品中，SO _2的存在明显增强了Cu-SSZ-13的高温活性，而在600°C时效的样品中，则不受阻碍。水热老化过程中SO ₂的存在对骨架Al没有影响。Cu ²⁺与SO ₂的相互作用导致ZCuHSO ₄的形成，这有助于抑制Cu的聚集²⁺转化为CuO并保持更多的孤立Cu ²⁺，从而在高温下具有更高的活性。低的Cu含量在更稳定的位点产生较高的Cu ²⁺物种相对种群。600和700°C时效样品的低温（≤350°C）活性略有降低。