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

doi:10.1016/j.cjche.2021.04.039

Abstract

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

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

Huawang Zhao, Xiaomin Wu, Zhiwei Huang, Ziyi Chen, Guohua Jing. A comparative study of the thermal and hydrothermal aging effect on Cu-SSZ-13 for the selective catalytic reduction of NO_x with NH₃[J]. Chinese Journal of Chemical Engineering, 2022, 45(5): 68-77.

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

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

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