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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)
1994
发表期刊ACTA PHYSICO-CHIMICA SINICA
卷号10期号:7页码:623-627
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
文章类型Article
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).
关键词Cu/gamma-Al2O3 catalyst Calcination temperature EXAFS
学科领域Chemistry
DOI10.3866/PKU.WHXB19940709
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语种英语
WOS研究方向Chemistry
WOS类目Chemistry, Physical
WOS记录号WOS:000207589400009
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/238135
专题多学科研究中心
作者单位中国科学院高能物理研究所
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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.
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