ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 2000,Vol.16>> Issue(02)>> 105-110     doi: 10.3866/PKU.WHXB20000203         中文摘要
Thermal Decomposition Behavior of Mg(NO3)2 on γ-Al2O3 and Basicity of MgO/γ-Al2O3
Jiang De-En, Zhao Bi-Ying, Xie You-Chang
Institute of Physical Chemistry,Peking University,Beijing 100871
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The state and thermal decomposition behavior of Mg(NO3)2 on γ-Al2O3 at different Mg loading were studied by XRD and TG DTA. The basicity of MgO/γ-Al2O3 with different Mg loading was investigated by CO2 TPD and compared with t hat of Mg Al mixed oxides derived from hydrotalcite. Results show that Mg(NO3)2 can disperse on γ Al2O3 as a monolayer and its dispersion determines the dispersion threshold of MgO on γ-Al2O3. Mg(NO3)2 in dispersion state has lower decomposition temperature than that in crystal state. The amount of basic sites per square meter on the surface of MgO/γ-Al2O3 shows a highest value around the loading of threshold, which indicates that the basicity of MgO/γ-Al2O3 originates from MgO in dispersion state. The basicity of MgO/γ-Al2O3 around the thresh old loading is comparable and even superior to that of Mg(Al)O derived from hydrotalcite. Since the texture and specific area of γ-Al2O3 can be easily adapted and there are various kinds of commercial γ-Al2O3 available, MgO/γ-Al2O3 is a promising solid base that may be found in use.

Keywords: Mg(NO3)2/γ-Al2 O3   MgO/γ-Al2O3   Supported solid base   Thermal decomposition   CO2-TPD  
Received: 1999-05-12 Accepted: 1999-06-21 Publication Date (Web): 2000-02-15
Corresponding Authors: Zhao Bi-Ying Email:

Cite this article: Jiang De-En, Zhao Bi-Ying, Xie You-Chang. Thermal Decomposition Behavior of Mg(NO3)2 on γ-Al2O3 and Basicity of MgO/γ-Al2O3[J]. Acta Phys. Chim. Sin., 2000,16 (02): 105-110.    doi: 10.3866/PKU.WHXB20000203
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