Discerning the Role of Ag-O-Al Entities on Ag/gamma-Al2O3 Surface in NOx Selective Reduction by Ethanol

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	Discerning the Role of Ag-O-Al Entities on Ag/gamma-Al2O3 Surface in NOx Selective Reduction by Ethanol
	Deng, Hua; Yu, Yunbo; He, Hong
刊名	JOURNAL OF PHYSICAL CHEMISTRY C
	2015-02-12
卷号	119 期号:6 页码:3132-3142
英文摘要	Alumina-supported silver catalysts (Ag/Al2O3) derived from AlOOH, Al(OH)(3), and Al2O3 were investigated for the selective catalytic reduction of NOx by ethanol. In order to discern the role of support Al skeleton in anchoring silver species and reducing NOx, the series of alumina-supported silver catalysts calcined at different temperatures was characterized by means of in situ DRIFTS, XPS, UVvis DRS, XRD, BET, and NMR. It was found that the NOx reduction efficiency order as affected by alumina precursors could be generally described as AlOOH > Al2O3 >> Al(OH)(3), with the optimum calcination temperature of 600 degrees C. XPS and UV-vis results indicated that silver ions predominated on the Ag/Al2O3 surface. Solid state NMR suggested that the silver ions might be anchored on Al tetrahedral and octahedral sites, forming Ag-O-Al-tetra and Ag-O-A(locta) entities. With the aid of NMR and DFT calculation, A(locta) was found to be the energetically favorable site to support silver ions. However, DFT calculation indicated that the Ag-O-Al-tetra entity can significantly adsorb and activate vital -NCO species rather than the Ag-O-Al-octa entity. A strongly positive correlation between the amount of Al-tetra structures and N-2 production rate confirms the crucial role of Al-tetra in NOx reduction by ethanol.
研究领域[WOS]	Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS记录号	WOS:000349578400025
公开日期	2016-03-15
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/32467]
专题	生态环境研究中心_大气污染控制中心
推荐引用方式 GB/T 7714	Deng, Hua,Yu, Yunbo,He, Hong. Discerning the Role of Ag-O-Al Entities on Ag/gamma-Al2O3 Surface in NOx Selective Reduction by Ethanol[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2015,119(6):3132-3142.
APA	Deng, Hua,Yu, Yunbo,&He, Hong.(2015).Discerning the Role of Ag-O-Al Entities on Ag/gamma-Al2O3 Surface in NOx Selective Reduction by Ethanol.JOURNAL OF PHYSICAL CHEMISTRY C,119(6),3132-3142.
MLA	Deng, Hua,et al."Discerning the Role of Ag-O-Al Entities on Ag/gamma-Al2O3 Surface in NOx Selective Reduction by Ethanol".JOURNAL OF PHYSICAL CHEMISTRY C 119.6(2015):3132-3142.