Microcalorimetric Studies of Zn—Al Mixed Oxides Obtained From Hydrotalcite-type Precursors

被引：0
|
作者：
M. Tu
J. Shen
Y. Chen
机构：
[1] Nanjing University,Department of Chemistry
来源：
Journal of Thermal Analysis and Calorimetry | 1999年 / 58卷
关键词：
microcalorimetric adsorption; surface acidity; surface basicity; Zn–Al hydrotalcite; Zn–Al mixed oxide;
D O I：
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中图分类号：
学科分类号：
摘要：
A series of Zn–Al hydrotalcites with Zn/Al molar ratios of 1, 2, 3 and 6 were prepared by co-precipitation method. TG-DTG results showed that the hydrotalcites decompose in two stages, corresponding to the two endothermic peaks around 180 and 220°C. After calcination at 400°C, the samples were converted into Zn–Al mixed oxides with the only XRD pattern of ZnO, except for the sample with the ratio of 6. The Zn–Al mixed oxides possess similar surface acidity revealed by microcalorimetric adsorption of NH3. The basicity of the samples increases with the order: ZnO>6Zn/Al>1Zn/Al>Al2O3.
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页码：441 / 446
页数：5
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