Promotional effect of rare earth-doped manganese oxides supported on   activated semi-coke for selective catalytic reduction of NO with NH3

doi:10.1007/s11356-017-0084-1

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	Promotional effect of rare earth-doped manganese oxides supported on activated semi-coke for selective catalytic reduction of NO with NH3
	Yan, Zheng ; Qu, Yanxin ; Liu, Lili ; Ge, Xinlei ; Yang, Jiayao ; Wei, Lihong ; Yang, Tianhua ; Wang, Xidong
刊名	ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
	2017
关键词	Low-temperature SCR Rare earth oxides MnOx Hydrothermal synthesis NH3-SCR reaction mechanism In situ DRIFTS LOW-TEMPERATURE SCR CARBON NANOTUBES CERIUM OXIDE SUPERIOR CATALYST NITRIC-OXIDE ADSORPTION OXIDATION AMMONIA PERFORMANCE MECHANISM
DOI	10.1007/s11356-017-0084-1
英文摘要	A composite catalyst for the selective catalytic reduction (SCR) of NOx with NH3 is investigated, in which the rare earth (RE, including La, Ce, Pr, and Nd) is doped into manganese oxides supported on activated semi-coke (MnOx/ASC) via hydrothermal method at the molar ratio of Mn: RE = 1: 5. It is evidenced that the addition of RE at a rather low molar ratio can enhance the catalytic activity of MnOx/ASC. The catalyst with a Mn: Ce molar ratio of 10: 1 yields an over 90% NOx removal efficiency in the temperature range of 150-250 degrees C. An approximate 100% NO conversion and 95% N-2 selectivity are achieved at about 200 degrees C. The catalysts are characterized by N-2 physisorption, X-ray powder diffraction (XRD), scanning electron microscope (SEM), hydrogen temperature-programmed reduction (H-2-TPR) and X-ray photoelectron spectroscopy (XPS). The results indicated that the Ce additive is conducive to the NOx adsorption and then accelerates the SCR reaction due to the formation of more chemisorbed oxygen (O-beta), which is favored during the oxidation of NH3 and NO. Moreover, the in situ diffused reflectance infrared Fourier transform spectroscopy (DRIFTS) results confirm that the Ce additive on MnOx/ASC catalyst could provide more active Bronsted acid sites, which eventually contributes to the SCR reaction. The generation of ad-NH4+ and nitrite species is proved to play the crucial role in the promotional effect of RE addition.; National Natural Science Foundation of China [51608333]; Research Foundation of Education Bureau of Liaoning Province, China [L2015413]; Jiangsu Engineering & Technology Research Center of Environmental Cleaning Materials (ECM) [KHK 1414]; Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD); SCI(E); ARTICLE; 31; 24473-24484; 24
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/484537]
专题	工学院
推荐引用方式 GB/T 7714	Yan, Zheng,Qu, Yanxin,Liu, Lili,et al. Promotional effect of rare earth-doped manganese oxides supported on activated semi-coke for selective catalytic reduction of NO with NH3[J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,2017.
APA	Yan, Zheng.,Qu, Yanxin.,Liu, Lili.,Ge, Xinlei.,Yang, Jiayao.,...&Wang, Xidong.(2017).Promotional effect of rare earth-doped manganese oxides supported on activated semi-coke for selective catalytic reduction of NO with NH3.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH.
MLA	Yan, Zheng,et al."Promotional effect of rare earth-doped manganese oxides supported on activated semi-coke for selective catalytic reduction of NO with NH3".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH (2017).