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Synthesis and Characterization of Mesoporous Alumina via a reverse precipitation Method

Journal of Materials Science & Technology 2012年第6期28卷 572-576页

作者： Y.S.Wu J.Ma F.Hu M.C.Li College of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

Mesoporous aluminaΥ-AI203 with high specific surface area and large pore volume is prepared by using a facile reverse precipitation method from sodium aluminate and nitric acid. The effects of terminal pH value, aging time and thermal stability on the characterization of Υ-Al2Oa are studied by means of X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FTIR）, Brunauer-Emmett-Teller （BET） method and scanning electron microscopy （SEM）. The results show that Υ-A1203 with better properties can be obtained by changing the preparation parameters. High BET surface area of 340 m2/g can be obtained by calcining at 500℃ for 4 h with large pore volume of 0.90 cm3/g and average pore size of 7.6 nm. After calcining at 1000°, the surface area is still 86 m2//g and the pore volume is 0.37 cm31/g.

关键词： Mesoporous alumina reverse precipitation Thermal stability

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Synthesis of γ-Al2O3 with High Surface Area and Large Pore Volume by reverse precipitation- azeotropic Distillation Method

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Chemical Research in Chinese Universities 2013年第2期29卷 206-209页

作者： WU Yu-sheng MA Jiao LI Ming-chun HU Fang School of Materials Science and Engineering Shenyang University of Technology Shenyang 110870 P. R. China

γ-Al2O3 with high surface area and large pore volume combined with high thermal stability was synthe- sized by a reverse precipitation-azeotropic distillation method. The effects of azeotropic distillation on the characte- ristics of γ-Al2O3 were studied by means of X-ray diffraction（XRD）, Fourier transform infrared（FTIR） spectroscopy, transmission electron microscopy（TEM） and N2 adsorption-desorption. The results show that γ-Al2O3 dried by azeo- tropic distillation has excellent structure characteristics with a high surface area of 426 m2/g and a large pore volume of 2.56 cm3/g. After calcination at 1100 ℃, the surface area of γ-Al2O3 was still 92 mE/g with a large pore volume of 1.00 cma/g, indicating the potential application in catalyst and petroleum industry.

关键词： reverse precipitation Azeotropic distillation y-Alumina n-Butyl alcohol Thermal stability

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Facile Synthesis of Mesoporous Si-containing γ-Al2O3 Nanofiber with Enhanced Thermal Stability

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Chemical Research in Chinese Universities 2015年第1期31卷 156-159页

作者： HU Fang WANG Yamin LAI Xiaoyong WU Yusheng DU Fei WANG Chunzhong School of Materials Science and Engineering Shenyang University of Technology Shenyang 110870 P. R. China State Key Laboratory Cultivation Base of Natural Gas Conversion Ningxia University Yinchuan 750021 P. R. China Key Laboratory of Advanced Batteries Physics and Technology Ministry of Education College of Physics Jilin University Changchun 130012 P. R. China

Mesoporous γ-Al2O3 nanofiber was prepared via a simple reverse precipitation route using Si-containing Al（OH）3 and HNO3 as raw materials. The resultant Si-containing mesoporous γ-Al2O3 nanofiber exhibited high surface area of 320 m^2/g, large pore volume of 1.17 cm^3/g and large pore size of 10.5 nm. The introduction of Si element remarkably enhanced the thermal stability of mesoporous γ-Al2O3. The as-prepared nanofiber could maintain relative high surface area（110 m^2/g） and pore volume（0.73 cm^3/g） up to 1100 ℃. The effects of various experimental conditions, such as pH value, reaction temperature and aging temperature on the structural properties of the mesoporous γ-Al2O3 were also investigated.

关键词： Mesoporous γ-Al2O3 reverse precipitation Thermal stability Nanofiber

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