Cerium-Stabilized Cu-SSZ-13 Catalyst for the Catalytic Removal of NOx by NH3

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• 作者：Jiancheng Wang ; Zhaoliang Peng ; Hui Qiao ; Huafeng Yu ; Yongfeng Hu ; Liping Chang ; Weiren Bao
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：February 10, 2016
• 年：2016
• 卷：55
• 期：5
• 页码：1174-1182
• 全文大小：583K
• ISSN：1520-5045

文摘

Cerium-modified Cu-SSZ-13 catalysts were synthesized by an in situ hydrothermal method, and Ce was incorporated through ion exchange. The catalytic performance and N₂ selectivity over prepared catalysts were evaluated in the selective catalytic reduction (SCR) of NO_x by NH₃. The physicochemical properties of the samples were characterized using XRD, SEM, H₂-TPR, XPS, NMR, XAS, and N₂ adsorption. The results indicated that Cu-SSZ-13 modified by Ce showed better NO_x removal efficiency and aging resistance. The optimized condition was ion exchanged for 2 h in a cerous nitrate solution. The introduction of Ce effectively restrained the conversion of an active Cu component (Cu²⁺ → Cu⁺) during the hydrothermal aging. Ce³⁺ species strongly associated with molecular sieve carriers and only slight skeleton dealumination was observed on the sample exchanged for 2 h, thus resulting in the further stabilization of catalyst active centers, which consequently maintained the catalytic activity and antiaging ability.