Si/AI Ratio Determines the SCR Performance of Cu-SSZ-13 Catalysts in the Presence of NO2

Yu Sun; Yu Fu; Yulong Shan

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Si/AI Ratio Determines the SCR Performance of Cu-SSZ-13 Catalysts in the Presence of NO2

机译：Si/AI Ratio Determines the SCR Performance of Cu-SSZ-13 Catalysts in the Presence of NO2

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A comparative study was performed to investigate the NH3-selective catalytic reduction (SCR) reaction activity of Cu-SSZ-13 zeolites having Si/AI 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 microscopy, electron paramagnetic resonance, H2-temperature-pro-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.

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来源
《Environmental Science & Technology: ES&T》 |2022年第24期|17946-17954|共9页
作者
Yu Sun; Yu Fu; Yulong Shan;
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作者单位

State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

University of Chinese Academy of Sciences, Beijing 100049, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
NH3-SCR; NO2; Si/Al; Cu-SSZ-13; Brensted acid sties;

Si/AI Ratio Determines the SCR Performance of Cu-SSZ-13 Catalysts in the Presence of NO2

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