期刊
CATALYSTS
卷 13, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/catal13040742
关键词
Cu-SSZ-16; Ce content; NH3-SCR; low temperature; hydrothermal stability
Cu-exchanged SSZ-16 zeolite catalysts were modified with Ce to improve their hydrothermal stability. Increasing Ce contents significantly enhanced the stability, with CuCe0.87-SSZ-16 showing the best performance. Characterization measurements revealed that Ce modification strengthened the structural stability and increased the active Cu2+-2Z species, contributing to the improved hydrothermal stability.
Cu-exchanged SSZ-16 zeolite catalysts exhibit outstanding NH3-SCR activity, but their catalytic performance after hydrothermal treatments is not ideal. In order to improve the hydrothermal stability of Cu-SSZ-16, CuCex-SSZ-16 series catalysts were prepared via an ion exchange process, and the effect of Ce modification on the hydrothermal stability was investigated. In addition, increasing Ce contents significantly improved the hydrothermal stability, and CuCe0.87-SSZ-16 showed the best hydrothermal stability. The effects of adding Ce to active species and the AFX framework were studied by various characterization measurements. The Al-27 MAS NMR results reveal that Ce modification can strengthen the structural stability of the CuCex-SSZ-16 catalysts. Furthermore, the combined results of XPS, H-2-TPR, and in situ DRIFTS confirm that the introduction of Ce markedly increases the active Cu2+-2Z species, contributing to the remarkable hydrothermal stability.
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