The Effect of Different Calcination Temperature on the Structure of Cu/gamma-Al2O3 Catalysts

	The Effect of Different Calcination Temperature on the Structure of Cu/gamma-Al2O3 Catalysts
	Fang, SN; Jiang, M; Fu, YL; Lin, PY; Qiao, S; Xie, YN; Qiao S(乔山); Xie YN(谢亚宁)
刊名	ACTA PHYSICO-CHIMICA SINICA
	1994
卷号	10 期号:7 页码:623-627
关键词	Cu/gamma-Al2O3 catalyst Calcination temperature EXAFS
通讯作者	[Fang Shunong ; Jiang Ming ; Fu Yilu ; Lin Peiyan] Univ Sci & Technol China, Dept Modern Chem, Hefei 230026, Anhui, Peoples R China ; [Qiao Shan ; Xie Yaning] Inst High Energy Phys, BSRF, Beijing 100039, Peoples R China
英文摘要	In this paper, the effects of calcination temperatures (350-1000 degrees C) and metal loadings (5 15% Cu) on copper species of Cu/gamma-Al2O3 catalysts are studied by means of XRD and EXAFS. For the catalysts, high dispersion state of the copper species could occur at calcination temperature below 700 degrees C, The. Cu-O coordination peaks at close to 0.16nm were fitted according to Cu2+ taking octahedral (Oh) and tetrahedral (Td) sites. The results of two coordination shell fitting show that the average oxygen coordination numbers of Cu2+ (Oh) varies between 5.1 and 6.0. For 5CuY (Y: 350-700 degrees C), the ratio of Cu2+ (Oh)/Cu2+ (Td) decreases gradually as calcination temperature increases, which means that Cu2+ ions in Oh move into Td site, and the coordination distance and average coordination number of Cu2+ (Oh) increase, indicating the Cu2+ (Oh) diffuse from open distorted Oh environment into symmetry one. As fur 5Cu900, high temperature calcination makes Cu2+ ions diffusing into support phase, partly forming CuAl2O4. The value of Cu2+ (Oh)/Cu2+ (Td) is the same as that in CuAl2O4 at higher temperature (1000 degrees C) or high loadings (10, 15% Cu).
学科主题	Chemistry
类目[WOS]	Chemistry, Physical
研究领域[WOS]	Chemistry
原文出处	SCI
语种	英语
WOS记录号	WOS:000207589400009
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/238135]
专题	高能物理研究所_多学科研究中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Fang, SN,Jiang, M,Fu, YL,et al. The Effect of Different Calcination Temperature on the Structure of Cu/gamma-Al2O3 Catalysts[J]. ACTA PHYSICO-CHIMICA SINICA,1994,10(7):623-627.
APA	Fang, SN.,Jiang, M.,Fu, YL.,Lin, PY.,Qiao, S.,...&谢亚宁.(1994).The Effect of Different Calcination Temperature on the Structure of Cu/gamma-Al2O3 Catalysts.ACTA PHYSICO-CHIMICA SINICA,10(7),623-627.
MLA	Fang, SN,et al."The Effect of Different Calcination Temperature on the Structure of Cu/gamma-Al2O3 Catalysts".ACTA PHYSICO-CHIMICA SINICA 10.7(1994):623-627.