硅铝比对Cu/SSZ-13SCR活性位的影响

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Abstract

Cu/SSZ-13catalysts with different Si/Al ratio were prepared by a solid-state ion exchange method, which were used for selective catalytic reduction of NO_x with NH₃ (NH₃-SCR) reaction. Various characterization methods, including X-ray diffraction (XRD), temperature programmed reduction with H₂ (H₂-TPR), temperature programmed desorption (TPD) of NO_x, temperature programmed desorption (TPD) of NH₃, and in situ diffuse reflectance FTIR spectroscopy (in situ DRIFTS), were used to elucidate the different catalytic performance over these Cu/SSZ-13catalysts. Compared with Cu/SSZ-13(25) and Cu/SSZ-13(5), Cu/SSZ-13(10) showed relatively superior SCR activity, with more than 80% NO conversion between 200 and 450℃. The XRD and H₂-TPR results suggested that Si/Al ratio could influence the dispersion of Cu species and redox property of Cu/SSZ-13 catalysts. The XRD and H₂-TPR results indicated that there were the most isolated Cu²⁺ ions existed in Cu/SSZ-13(10). Cu²⁺ ions could provide NO_x-adsorbed sites and Lewis acid sites over Cu/SSZ-13, which mainly account for its low-temperature SCR activity. However, the NO conversion of Cu/SSZ-13(25) decreased obviously in the whole temperature range, due to the significant loss of Lewis acid sites.

Key words： nitrogen oxide NH₃-SCR Cu/SSZ-13 Si/Al ratio active site

Received: 18 July 2019

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X505

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	Articles by authors
	QIN Xuan
	YIN De-jia
	YU Li-ze
	ZHANG Tao
	CHANG Hua-zhen
	ZHU Yan
	LIU Guo-hua
	LI Jun-hua

Cite this article:

QIN Xuan,YIN De-jia,YU Li-ze等. Effect of Si/Al ratio on the SCR active sites of Cu/SSZ-13[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(2): 591-599.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I2/591

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