Hydrothermal Stability Enhancement of Al-Rich Cu-SSZ-13 for NH3 Selective Catalytic Reduction Reaction by Ion Exchange with Cerium and Samarium,Industrial & Engineering Chemistry Research

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Hydrothermal Stability Enhancement of Al-Rich Cu-SSZ-13 for NH3 Selective Catalytic Reduction Reaction by Ion Exchange with Cerium and Samarium
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-03-25 , DOI: 10.1021/acs.iecr.0c00285
Yingjie Wang _{1,

2} , Xiaoyan Shi _{1,

2} , Yulong Shan _{1,

2} , Jinpeng Du _{1,

2} , Kuo Liu ₁ , Hong He _{1,

2,

3}

Affiliation

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.

中文翻译：

铈和mar离子交换对Al 3富集的Cu-SSZ-13进行NH ₃选择性催化还原反应的水热稳定性增强

通过离子交换法制备了铈或sa改性的Cu-SSZ-13催化剂（Si / Al = 3.6）。这样，可以将约0.3–0.7 wt％的Ce或Sm引入Cu-SSZ-13。对于包含2.0-3.3 wt％Cu的铈或sa改性的Cu-SSZ-13，观察到结构稳定性显着提高。详细研究了含2.6 wt％铜的Cu-SSZ-13样品及其经Ce或Sm改性的对应物。根据骨架结构（XRD和²⁷ Al NMR），酸度（NH ₃ -TPD和DRIFTS）以及Cu种类（EPR和H ₂ -TPR）的特征，我们证实了活性Cu ²⁺的稳定性铈或sa离子的共存可增强Cu-SSZ-13中的离子，这将为改善Cu-SSZ-13的水热稳定性做出重要贡献。另外，通过质子与共阳离子的交换来防止构架A 1水解应该是不太重要的因素。

更新日期：2020-03-26

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