Si/Al Ratio Determines the SCR Performance of Cu-SSZ-13 Catalysts in the Presence of NO2
文献类型：期刊论文
| 作者 | Sun, Yu ; Fu, Yu; Shan, Yulong; Du, Jinpeng; Liu, Zhongqi; Gao, Meng; Shi, Xiaoyan; He, Guangzhi; Xue, Sen; Han, Xuewang
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| 刊名 | ENVIRONMENTAL SCIENCE & TECHNOLOGY
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| 出版日期 | 2022 |
| 卷号 | 56期号:24页码:1-9 |
| ISSN号 | 0013-936X |
| 英文摘要 | A comparative study was performed to investigate the zeolites having Si/Al ratios (SARs) of 5, 18, and 30. Remarkably, the Cu-SSZ-13 zeolite catalysts exhibited completely opposite behaviors as a function of SAR under standard SCR (SSCR) and fast SCR (FSCR) reaction atmospheres. Under SSCR conditions, the NOx conversion increased as expected with the decreasing SAR. Under FSCR conditions, however, the NOx conversion decreased as the SAR decreased, contrary to expectations. In this study, based on characterization of the catalysts by X-ray diffraction, transmission electron grammed reduction, temperature-programmed desorption, and diffuse reflectance infrared Fourier transform spectroscopy, together with theoretical calculations, the authors found that the amount of Bronsted acid sites goes up while the SAR goes down, leading to an increase in the accumulation of NH4NO3 under FSCR reaction conditions. Moreover, the accumulated NH4NO3 is of greater stability for those low SAR Cu-SSZ-13 catalysts. These two reasons cause the FSCR performance of Cu-SSZ-13 to decrease with a decrease in SAR. As a result, the NO2 effect on SCR activity changes from promotion to inhibition as the SAR decreases. KEYWORDS: NH3-SCR, NO2, Si/Al, Cu-SSZ-13, Bronsted acid sties |
| 源URL | [https://ir.rcees.ac.cn/handle/311016/48460]  |
| 专题 | 生态环境研究中心_大气污染控制中心 |
| 作者单位 | 1.Institute of Urban Environment, CAS 2.Chinese Academy of Sciences 3.Research Center for Eco-Environmental Sciences (RCEES) 4.University of Chinese Academy of Sciences, CAS |
| 推荐引用方式 GB/T 7714 | Sun, Yu,Fu, Yu,Shan, Yulong,et al. Si/Al Ratio Determines the SCR Performance of Cu-SSZ-13 Catalysts in the Presence of NO2[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2022,56(24):1-9. |
| APA | Sun, Yu.,Fu, Yu.,Shan, Yulong.,Du, Jinpeng.,Liu, Zhongqi.,...&He, Hong.(2022).Si/Al Ratio Determines the SCR Performance of Cu-SSZ-13 Catalysts in the Presence of NO2.ENVIRONMENTAL SCIENCE & TECHNOLOGY,56(24),1-9. |
| MLA | Sun, Yu,et al."Si/Al Ratio Determines the SCR Performance of Cu-SSZ-13 Catalysts in the Presence of NO2".ENVIRONMENTAL SCIENCE & TECHNOLOGY 56.24(2022):1-9. |
入库方式： OAI收割
来源：生态环境研究中心
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