Modified-EISA synthesis of mesoporous high surface area CeO_2 and catalytic property for CO oxidation
来源期刊：JOURNAL OF RARE EARTHS2009年第6期
论文作者：LI Xiazhang CHEN Feng CHEN Zhigang NI Chaoying LU Xiaowang
Key words：ceria; mesoporous; surface area; catalytic oxidation; rare earths;
Abstract: Mesoporous CeO_2 particles with high surface area were synthesized using a modified evaporation-induced self assembly(EISA) method which combined citric acid as complexing agent. As-prepared powder and further thermal treatment samples were characterized by X-ray diffraction(XRD), transmission electron microscopy(TEM), selected area electron diffraction(SAED), Fourier transform infrared spec-trometer(FTIR), thermogravimetry and differential thermal analysis(TG-DTA), Brunauer-Emmett-Teller(BET) and Barrett-Joyner-Halenda (BJH) method. It was found that the cerium oxide/surfactant mixture gave rise to pure and fluorite-structured CeO_2 after calcination at 573 K.Moreover, the textural analysis revealed high specific surface area (205 m~2/g) and mesoporous structure of the sample. The catalytic per-formances of mesoporous CeO_2 heated at different temperatures for CO oxidation were examined. The catalytic tests exhibited that the prod-uct had enhanced catalytic efficiency compared with the decomposed ceria.
LI Xiazhang1，CHEN Feng2，CHEN Zhigang2，NI Chaoying3，LU Xiaowang2
(1.School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,China;
2.School of Materials Science and Engineering,Jiangsu Polytechnic University,Changzhou 213164,China;
3.Department of Materials Science and Engineering,University of Delaware,Newark 19716,USA)
Abstract:Mesoporous CeO_2 particles with high surface area were synthesized using a modified evaporation-induced self assembly(EISA) method which combined citric acid as complexing agent. As-prepared powder and further thermal treatment samples were characterized by X-ray diffraction(XRD), transmission electron microscopy(TEM), selected area electron diffraction(SAED), Fourier transform infrared spec-trometer(FTIR), thermogravimetry and differential thermal analysis(TG-DTA), Brunauer-Emmett-Teller(BET) and Barrett-Joyner-Halenda (BJH) method. It was found that the cerium oxide/surfactant mixture gave rise to pure and fluorite-structured CeO_2 after calcination at 573 K.Moreover, the textural analysis revealed high specific surface area (205 m~2/g) and mesoporous structure of the sample. The catalytic per-formances of mesoporous CeO_2 heated at different temperatures for CO oxidation were examined. The catalytic tests exhibited that the prod-uct had enhanced catalytic efficiency compared with the decomposed ceria.
Key words:ceria; mesoporous; surface area; catalytic oxidation; rare earths;
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