Citation: XU Shu-Hao, LIN Qing-Jing, LIU Shuang, LIU Jing-Ying, XU Hai-Di, WANG Jian-Li, CHEN Yao-Qiang. Promotional Effects of Silanization on the Hydrothermal Stability of CuCe/BEA Catalyst for Selective Catalytic Reduction of NO_x with NH₃[J]. Chinese Journal of Inorganic Chemistry, ;2020, 36(12): 2385-2394. doi: 10.11862/CJIC.2020.256 shu

Promotional Effects of Silanization on the Hydrothermal Stability of CuCe/BEA Catalyst for Selective Catalytic Reduction of NO_x with NH₃

XU Shu-Hao ¹ ,
LIN Qing-Jing ² ,
LIU Shuang ³ ,
LIU Jing-Ying ¹ ,
XU Hai-Di ^3,4,5,, ,
WANG Jian-Li ^1,4,5,, ,
CHEN Yao-Qiang ^1,3,4,5

1.
Sichuan Provincial Environmental Protection Environmental Catalytic Materials Engineering Technology Center, College of Chemistry, Sichuan University, Chengdu 610064, China
2.
State Key Laboratory of Polymer Materials Engineering, Institute of Polymer Science, Sichuan University, Chengdu 610064, China
3.
Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610064, China
4.
National Engineering Laboratory for Mobile Source Emission Control Technology, China Automotive Technology & Research Center, Tianjin 300300, China
5.
Sichuan University FGD(Flue Gas Desulfurization) State Engineering Research Center, Chengdu 610064, China

Corresponding author: XU Hai-Di, xuhaidi@scu.edu.cn WANG Jian-Li, wangjianli@scu.edu.cn
Received Date: 17 June 2020
Revised Date: 11 September 2020

Figures(8)

The hydrothermal stability of CuCe/BEA catalyst is improved by its silanization for selective catalytic reduction of NO_x with NH₃ (NH₃-SCR). The results indicate that the silanization modification effectively enhances the catalytic activity of CuCe/BEA after the hydrothermal treatment due to significantly inhibit the hydrolysis of Si-O-Al bonds from the BEA skeleton to maintain structural integrity, revealed by X-ray diffraction (XRD), scanning electron microscope (SEM) and ²⁷Al nuclear magnetic resonance (²⁷Al NMR). More complete skeleton structure of CuCeSi/BEA catalyst results in the formation of more acid sites after the hydrothermal treatment, confirmed by NH₃-temperature programmed desorption (NH₃-TPD) and in situ diffuse reflectance infrared transform spectroscopy (in situ DRIFTS). Moreover, H₂-temperature programmed reduction (H₂-TPR) and X-ray photoelectron spectrum (XPS) show that silanization is beneficial to facilitate the dispersion of active copper ions after the hydrothermal treatment. Therefore, more acid sites and highly dispersed Cu species together contribute to higher hydrothermal stability of silanized CuCeSi/BEA than CuCe/BEA catalyst.
- silanization,
- zeolite,
- hydrothermal stability,
- structure-activity relationships,
- heterogeneous catalysis
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沈阳化工大学材料科学与工程学院沈阳 110142

Promotional Effects of Silanization on the Hydrothermal Stability of CuCe/BEA Catalyst for Selective Catalytic Reduction of NOx with NH3

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通讯作者: 陈斌, bchen63@163.com

Promotional Effects of Silanization on the Hydrothermal Stability of CuCe/BEA Catalyst for Selective Catalytic Reduction of NO_x with NH₃