Abstract Ce or La-doped Cu/SSZ-13 catalysts were prepared by a hydrothermal method and Cu, Ce or La ions were incorporated through stepwise ion exchange. The catalyst activity was measured for the NH3-SCR reaction. The structure and composition of catalyst were characterized by using XRD, SEM, ICP-MS, solid-state NMR, NH3-TPD techniques, and the active components were examined by XPS and XANES. The results indicate that the Ce and La doping can both completely preserve the SCR activity of Cu/SSZ-13 above 300 °C, but there is also a decrease of activity below 200 °C. On the other hand, Ce doping is beneficial to the formation of framework aluminum, stabilizes molecular sieve framework and Cu active sites of Cu/SSZ-13, thereby improves the catalyst hydrothermal stability. But La doping will decrease the amount of framework aluminum and Cu active sites of Cu/SSZ-13 after hydrothermally aging, even destroy zeolite CHA structure. This is quite harmful to the catalyst hydrothermal stability.

中文翻译：

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铈和镧掺杂的Cu/SSZ-13催化剂对NH3-SCR的水热老化效应对比研究

摘要 采用水热法制备Ce或La掺杂的Cu/SSZ-13催化剂，并通过逐步离子交换引入Cu、Ce或La离子。测量NH3-SCR反应的催化剂活性。采用XRD、SEM、ICP-MS、固态核磁共振、NH3-TPD技术对催化剂的结构和组成进行表征，并通过XPS和XANES检测活性组分。结果表明，Ce 和 La 掺杂在 300 °C 以上都可以完全保持 Cu/SSZ-13 的 SCR 活性，但在 200 °C 以下也有活性下降。另一方面，Ce掺杂有利于骨架铝的形成，稳定分子筛骨架和Cu/SSZ-13的Cu活性位点，从而提高催化剂的水热稳定性。但La掺杂会降低Cu/SSZ-13水热老化后骨架铝和Cu活性位点的数量，甚至破坏沸石CHA结构。这对催化剂的水热稳定性非常有害。