SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2022, Vol. 45 ›› Issue (5): 68-77.DOI: 10.1016/j.cjche.2021.04.039

• • 上一篇    下一篇

A comparative study of the thermal and hydrothermal aging effect on Cu-SSZ-13 for the selective catalytic reduction of NOx with NH3

Huawang Zhao, Xiaomin Wu, Zhiwei Huang, Ziyi Chen, Guohua Jing   

  1. Department of Environmental Science & Engineering, College of Chemical Engineering, Huaqiao University, Xiamen 361021, China
  • 收稿日期:2021-02-26 修回日期:2021-03-28 出版日期:2022-05-28 发布日期:2022-06-22
  • 通讯作者: Guohua Jing,E-mail:zhoujing@hqu.edu.cn
  • 基金资助:
    This work was supported by the National Key Research and Development Program of China (2018YFC0214103), the National Natural Science Foundation of China (22006044), and the Scientific Research Funds of Huaqiao University (605-50Y200270001).

A comparative study of the thermal and hydrothermal aging effect on Cu-SSZ-13 for the selective catalytic reduction of NOx with NH3

Huawang Zhao, Xiaomin Wu, Zhiwei Huang, Ziyi Chen, Guohua Jing   

  1. Department of Environmental Science & Engineering, College of Chemical Engineering, Huaqiao University, Xiamen 361021, China
  • Received:2021-02-26 Revised:2021-03-28 Online:2022-05-28 Published:2022-06-22
  • Contact: Guohua Jing,E-mail:zhoujing@hqu.edu.cn
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (2018YFC0214103), the National Natural Science Foundation of China (22006044), and the Scientific Research Funds of Huaqiao University (605-50Y200270001).

摘要: In this work, the characterizations of Cu-SSZ-13 after hydrothermal aging (HTA) and thermal aging (TA) at different temperatures (750, 800, and 850 ℃) are compared, and the differences between those two serious aged samples are analyzed. With this data, the effect of steam on catalysts deactivation during hydrothermal aging is analyzed. The TA at 750 and 800 ℃ causes the dealumination and the agglomeration of Cu2+ ions to CuO, resulting in the activity loss of Cu-SSZ-13. The presence of steam upon HTA at 750 and 800 ℃ aggravates the catalyst deactivation by increasing the Al detachment and the Cu2+ agglomeration. The structure and cupric state are almost the same in the Cu-SSZ-13 after TA and HTA at 850 ℃, respectively, indicating that the steam has little influence on the deactivation. The formation of CuAl2O4 spinel is the primary reason for the deactivation after both HTA and TA at 850 ℃, probably attributed to the strong interaction between Cu2+ ions and framework Al sites at high temperatures.

关键词: Emission control, Selective catalytic reduction, Cu-SSZ-13, Hydrothermal aging, Thermal aging

Abstract: In this work, the characterizations of Cu-SSZ-13 after hydrothermal aging (HTA) and thermal aging (TA) at different temperatures (750, 800, and 850 ℃) are compared, and the differences between those two serious aged samples are analyzed. With this data, the effect of steam on catalysts deactivation during hydrothermal aging is analyzed. The TA at 750 and 800 ℃ causes the dealumination and the agglomeration of Cu2+ ions to CuO, resulting in the activity loss of Cu-SSZ-13. The presence of steam upon HTA at 750 and 800 ℃ aggravates the catalyst deactivation by increasing the Al detachment and the Cu2+ agglomeration. The structure and cupric state are almost the same in the Cu-SSZ-13 after TA and HTA at 850 ℃, respectively, indicating that the steam has little influence on the deactivation. The formation of CuAl2O4 spinel is the primary reason for the deactivation after both HTA and TA at 850 ℃, probably attributed to the strong interaction between Cu2+ ions and framework Al sites at high temperatures.

Key words: Emission control, Selective catalytic reduction, Cu-SSZ-13, Hydrothermal aging, Thermal aging