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La ions-enhanced NH3-SCR performance over Cu-SSZ-13 catalysts

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Abstract

Lanthanum (La) ions are generally recognized to cause a decline of the catalytic performance for Cu-SSZ-13 zeolite in the selective catalytic reduction of NOx with NH3 (NH3-SCR). Herein, we demonstrate that the NH3-SCR performance and hydrothermal stability of Cu-La-SSZ-13 zeolites can be enhanced with the incorporation of a small amount of La ions. The incorporation of La ions into SSZ-13 favors more Z2Cu2+ ions at six-membered rings (6MRs), which results in higher hydrothermal stability of Cu-La-SSZ-13 than that of Cu-SSZ-13. The NO conversion of Cu-La-SSZ-13 achieves 5%–10% higher than that of Cu-SSZ-13 at the temperature range of 400–550 °C after hydrothermal ageing. While introducing excess amount of La ions in SSZ-13 may cause the formation of inactive CuOx, leading to the decrease of catalytic activity and hydrothermal stability. Notably, the low-temperature activity of Cu-SSZ-13 with a low Cu content (≤ 2 wt.%) can be boosted by the introduction of La ions, which is largely due to the improved redox ability of Cu active sites modified by La ions. Density functional theory (DFT) calculations indicate that La ions prefer to locate at eight-membered rings (8MRs) and thus promoting the formation of more Z2Cu2+ ions. Meanwhile, the existence of La ions in SSZ-13 inhibits the dealumination process and the transformation from Z2Cu2+ to CuOx, resulting in its enhanced hydrothermal stability. The present work sheds a new insight into the regulation of secondary metal cations for promoting high NH3-SCR performance over Cu-SSZ-13 zeolite catalysts.

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Acknowledgements

We thank the National Natural Science Foundation of China (Nos. 22288101, 21920102005, and 21835002) and the 111 Project (No. B17020) for supporting this work.

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  1. Mengyang Chen and Wenru Zhao contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China

    Mengyang Chen, Yingzhen Wei, Jinfeng Han, Junyan Li, Chang Sun & Jihong Yu

  2. School of Materials Science and Engineering, Tiangong University, Tianjin, 300387, China

    Wenru Zhao & Donghai Mei

  3. International Center of Future Science, Jilin University, Changchun, 130012, China

    Mengyang Chen & Jihong Yu

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  1. Mengyang Chen
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Correspondence to Donghai Mei or Jihong Yu.

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Chen, M., Zhao, W., Wei, Y. et al. La ions-enhanced NH3-SCR performance over Cu-SSZ-13 catalysts. Nano Res. 16, 12126–12133 (2023). https://doi.org/10.1007/s12274-023-5500-x

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