Citation: CHEN Jia-Wei, ZHAO Ru ZHOU, ZHOU Ren-Xian. In-Situ Synthesis of Cu-SSZ-13 Catalyst: Effect of Crystallization Time on NH_3^-SCR Performance[J]. Chinese Journal of Inorganic Chemistry, ;2018, 34(12): 2135-2142. doi: 10.11862/CJIC.2018.276 shu

In-Situ Synthesis of Cu-SSZ-13 Catalyst: Effect of Crystallization Time on NH_3^-SCR Performance

Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou 310028, China

Corresponding author: ZHOU Ren-Xian, zhourenxian@zju.edu.cn
Received Date: 29 May 2018
Revised Date: 24 September 2018

Figures(8)

Different Cu-SSZ-13 catalysts are prepared by one-pot synthesis by changing the crystallization time during the reaction and characterized using various analytical techniques, including H₂-temperature program reduction (H_2^-TPR), X-ray diffraction (XRD), electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS). The result demonstrated that the crystallization time had an important impact on the content and distribution of active copper species. The catalysts with proper crystallization time showed excellent activity and hydrothermal stability for the NH₃ selective catalytic reduction (NH_3^-SCR) reaction and the best crystallization time was about 4 d. In the zeolite, the unstable Cu_A²⁺ species may be converted to stable Cu_B²⁺ species and the Cu²⁺ species agglomerated together under high-temperature hydrothermal conditions. In conclusion, the collapse of the zeolite structure and the agglomeration of active Cu²⁺ species were the main reason for the deterioration of the hydrothermal stability.
- environmental chemistry,
- zeolites,
- hydrothermal synthesis
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

In-Situ Synthesis of Cu-SSZ-13 Catalyst: Effect of Crystallization Time on NH3-SCR Performance

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通讯作者: 陈斌, bchen63@163.com

In-Situ Synthesis of Cu-SSZ-13 Catalyst: Effect of Crystallization Time on NH_3^-SCR Performance