In this work, we report the synthesis of crystalline Cu-SSZ-13 catalyst by using different silica sources, including colloidal silica (silica sol), gelatinous silica (silica gel) and tetraethyl orthosilicate (TEOS). These samples were characterized by various techniques (SEM, XRD, BET, ICP-OES, H₂-TPR, NH₃-TPD, XAFS). The sample prepared by using silica sol exhibited regular morphology and uniform particle dispersions. The results also showed that different acidities and Cu ions distributions were present on these Cu-SSZ-13 catalysts. The various silica sources affected the physicochemical properties and subsequent catalytic performances in the selective catalytic reduction of NO by NH₃ (NO-SCR). Cu-SSZ-13 from TEOS showed obvious advantage for the catalytic activity at low-temperature region (< 200 °C). However, Cu-SSZ-13 from silica gel performed superior overall catalytic activity (200–600 °C) in the three samples. Furthermore, Cu-SSZ-13 from silica sol displayed superior hydrothermal stability after the same hydrothermal treatment for the three samples, despite of the similar movement of Cu²⁺ ions under aging process. Thus, the choice of silica sol as precursor source is more profitable for synthesis of Cu-SSZ-13.

在这项工作中，我们报告了使用不同的二氧化硅源（包括胶体二氧化硅（二氧化硅溶胶），凝胶状二氧化硅（硅胶）和原硅酸四乙酯）合成结晶Cu-SSZ-13催化剂的方法。这些样品通过各种技术（SEM，XRD，BET，ICP-OES，H ₂ -TPR，NH ₃ -TPD，XAFS）表征。通过使用硅溶胶制备的样品表现出规则的形态和均匀的颗粒分散。结果还表明，这些Cu-SSZ-13催化剂上存在不同的酸度和Cu离子分布。各种二氧化硅源均会影响NH ₃选择性催化还原NO的理化性质和随后的催化性能。（NO-SCR）。TEOS的Cu-SSZ-13在低温区域（<200°C）上具有明显的催化活性。但是，硅胶中的Cu-SSZ-13在这三个样品中表现出了优异的整体催化活性（200–600°C）。此外，尽管老化过程中Cu ²⁺离子的运动相似，但对三个样品进行相同的水热处理后，来自硅溶胶的Cu-SSZ-13表现出优异的水热稳定性。因此，选择二氧化硅溶胶作为前体来源对于合成Cu-SSZ-13更为有利。