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题名: Structure and base properties of calcined hydrotalcites
作者: Liu, HC;  Yang, XY;  Ran, GP;  Min, EZ;  Liu, JK;  Ying, PL;  Xin, Q;  Li, C
关键词: hydrotalcites ;  base property ;  catalyst ;  MAS-NMR ;  FT-IR
刊名: CHINESE JOURNAL OF CHEMISTRY
发表日期: 1999-07-01
卷: 17, 期:4, 页:319-330
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Five hydrotalcites with Mg/Al molar ratio range of 3-15 were prepared. The structure and basicity of Mg-Al mixed oxides (Mg(Al)O) transformed from hydrotalcites were investigated by TPD, XPS, XRD, FT-IR and NMR techniques. The results of elemental analysis and XPS indicate that Al is enriched in the surface regions of Mg(Al)O, and its amount increases with the Mg/Al molar ratio and, the calcination temperature. Al-27-MAS-NMR results show that Al exists in two chemical environments: tetrahedral aluminium (Al(t)) and octahedral aluminium (Al(o)) in Mg(AI)O. The amount of Al(t) increases with the Mg/Al molar ratio and the calcination temperature. It is assumed that Al(t) may be mainly from the surface Al. Temperature-programmed desorption (TPD) of CO2 shows that the number of basic sites of Mg(Al)O samples increases with the Mg/Al molar ratio, and the maximum number of basic sites is obtained for hydrotalcite calcined at 773 K. Infrared spectra of adsorbed CO2 and B(OCH3)(3) reveal that there are two kinds of basic sites: weak basic OH- sites and strong basic O2- sites on the Mg(AI)O samples, the base strength depends on the Mg/Al molar ratio and calcination temperature.
关键词[WOS]: SYNTHETIC HYDROTALCITE ;  THERMAL-DECOMPOSITION ;  CARBON-DIOXIDE ;  MIXED OXIDES ;  MAGNESIUM ;  METHANOL
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000082209300002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/87319
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Res Inst Petr Proc, Beijing 100083, Peoples R China
2.Peking Univ, Dept Chem, Beijing 100871, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Liu, HC,Yang, XY,Ran, GP,et al. Structure and base properties of calcined hydrotalcites[J]. CHINESE JOURNAL OF CHEMISTRY,1999,17(4):319-330.
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