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| In-Situ Synthesis of Cu-SSZ-13 Catalyst: Effect of Crystallization Time on NH3-SCR Performance |
| Author Name | Affiliation | E-mail | | CHEN Jia-Wei | Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou 310028, China | | | ZHAO Ru ZHOU | Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou 310028, China | | | Ren-Xian | Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou 310028, China | zhourenxian@zju.edu.cn |
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| Abstract: 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 (H2-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 (NH3-SCR) reaction and the best crystallization time was about 4 d. In the zeolite, the unstable CuA2+ species may be converted to stable CuB2+ 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. |
| Keywords: environmental chemistry zeolites hydrothermal synthesis |
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| CHEN Jia-Wei,ZHAO Ru ZHOU,Ren-Xian.In-Situ Synthesis of Cu-SSZ-13 Catalyst: Effect of Crystallization Time on NH3-SCR Performance[J].Chinese Journal of Inorganic Chemistry,2018,34(12):2135-2142. |
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