Cu-exchanged RTH-type zeolites for NH3-selective catalytic reduction of NOx: Cu distribution and hydrothermal stability

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	Cu-exchanged RTH-type zeolites for NH3-selective catalytic reduction of NOx: Cu distribution and hydrothermal stability
	Shan, Yulong ; Shi, Xiaoyan ; Du, Jinpeng ; Yu, Yunbo ; He, Hong
刊名	CATALYSIS SCIENCE & TECHNOLOGY
	2019-01-07
卷号	9 期号:1 页码:106-115
ISSN号	2044-4753
英文摘要	The Cu-exchanged RTH-type zeolites (Cu-RTH) were applied in ammonia-selective catalytic reduction (NH3-SCR) of NOx. The effects of Cu loading and distribution on the NOx reduction efficiency were investigated. The hydrothermal stabilities of a series of Cu-RTH catalysts were also presented. Excellent NOx conversion activity was observed for Cu-RTH catalysts with high Cu loadings (2.5-4.4 wt%) in the temperature range from 150 degrees C to 550 degrees C. Two possible sites ( and species) for Cu2+ species were proposed based on the analysis of H-2-TPR and DRIFTS results. The species next to the 8-membered rings showed significantly higher TOF (turnover frequency) of NO conversion than the species present next to the rth cage. The Cu-RTH catalysts showed lower activation energies (30-40 kJ mol(-1)) compared with that of the Cu-SSZ-13 catalyst (approximate to 54 kJ mol(-1)) due to the different zeolite framework structures. After undergoing hydrothermal aging, although the zeolite framework structure stayed stable, the active Cu2+ species migrated to inactive sites, which resulted in the loss of NOx conversion for the NH3-SCR reaction. The saturated Cu2+-exchanged Cu-4.4-RTH catalyst showed the best hydrothermal stability due to the limited Cu2+ mobility, which stabilized the active Cu2+ species.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/43230]
专题	生态环境研究中心_水污染控制实验室
作者单位	1.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China 2.Univ Chinese Acad Sci, Beijing 10049, Peoples R China 3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Shan, Yulong,Shi, Xiaoyan,Du, Jinpeng,et al. Cu-exchanged RTH-type zeolites for NH3-selective catalytic reduction of NOx: Cu distribution and hydrothermal stability[J]. CATALYSIS SCIENCE & TECHNOLOGY,2019,9(1):106-115.
APA	Shan, Yulong,Shi, Xiaoyan,Du, Jinpeng,Yu, Yunbo,&He, Hong.(2019).Cu-exchanged RTH-type zeolites for NH3-selective catalytic reduction of NOx: Cu distribution and hydrothermal stability.CATALYSIS SCIENCE & TECHNOLOGY,9(1),106-115.
MLA	Shan, Yulong,et al."Cu-exchanged RTH-type zeolites for NH3-selective catalytic reduction of NOx: Cu distribution and hydrothermal stability".CATALYSIS SCIENCE & TECHNOLOGY 9.1(2019):106-115.