Abstract
Cerium- or samarium-modified Cu-SSZ-13 catalysts (Si/Al = 3.6) were prepared through an ion-exchange method. In this way, around 0.3–0.7 wt % Ce or Sm can be introduced into Cu-SSZ-13. Markedly improved structure stability was observed for cerium- or samarium-modified Cu-SSZ-13 containing 2.0–3.3 wt % Cu. The Cu-SSZ-13 sample containing 2.6 wt % copper and its Ce- or Sm-modified counterparts were investigated in detail. According to the characterization of the framework structure (XRD and ²⁷Al NMR), acidity (NH₃-TPD and DRIFTS), and Cu species (EPR and H₂-TPR), we confirmed that the stability of active Cu²⁺ ions in Cu-SSZ-13 can be enhanced by the co-existence of cerium or samarium ions, which should result in an important contribution to the improvement of the hydrothermal stability of Cu-SSZ-13. In addition, preventing the framework Al from hydrolysis by the exchange of protons with co-cations should be a less important factor.
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