CIESC Journal ›› 2012, Vol. 20 ›› Issue (2): 312-318.

• 材料与产品工程 • 上一篇    下一篇

具有固定硅铝比的Al2O3-2SiO2纳米颗粒制备：过程优化与粉体转化

郑广俭1,2,3, 崔学民1, 张伟鹏1, 童张法1, 李峰2   

  1. 1 School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China 2 State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China 3 College of Chemistry and Life Science, Guangxi Teachers Education University, Nanning 530001, China
  • 收稿日期:2011-01-31 出版日期:2012-04-28 发布日期:2011-08-02

Al2O3-2SiO2 nanoparticles with defined Al-Si ratio: Processing optimization and conversion

ZHENG Guang-Jian1,2,3, CUI Xue-Min1, ZHANG Wei-Peng1, TONG Zhang-Fa1, LI Feng2   

  1. 1 School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China 2 State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China 3 College of Chemistry and Life Science, Guangxi Teachers Education University, Nanning 530001, China
  • Received:2011-01-31 Online:2012-04-28 Published:2011-08-02

摘要： Attempts had been made to synthesize Al2O3-2SiO2 nanopowders by sol-gel method with tetraethoxysilane (TEOS) and aluminum nitrate (ANN) as the starting materials. DTS, TEM, SEM and BET were employed to study the effects of process parameters on the size, specific surface area and structure (morphology) of powders. The alkali-activation reactivity of the powders was tested for manufacturing geopolymers and their hydrothermal reactions were performed for fabricating zeolites. The results show that the optimum process parameters and drying method for preparing Al2O3-2SiO2 nanopowders are as follows: the molar ratio of water and ethanol to TEOS are 0︰1 and 12︰1 respectively at synthetic temperature of 50 °C and the drying method is azeotropic distillation with microwave drying. The average particle diameters of the powders were about 70 nm and the largest BET specific surface area was up to 669 m2•g?1. The compressive strength of the geopolymer and the calcium exchange capacity (by CaCO3) of NaA zeolite prepared with the powders reached to 29 MPa and 366 mg•g?1 respectively.

关键词: parameter optimization, Al2O3-2SiO2 nanopowder, sol-gel, geopolymer, zeolite

Abstract: Attempts had been made to synthesize Al2O3-2SiO2 nanopowders by sol-gel method with tetraethoxysilane (TEOS) and aluminum nitrate (ANN) as the starting materials. DTS, TEM, SEM and BET were employed to study the effects of process parameters on the size, specific surface area and structure (morphology) of powders. The alkali-activation reactivity of the powders was tested for manufacturing geopolymers and their hydrothermal reactions were performed for fabricating zeolites. The results show that the optimum process parameters and drying method for preparing Al2O3-2SiO2 nanopowders are as follows: the molar ratio of water and ethanol to TEOS are 0︰1 and 12︰1 respectively at synthetic temperature of 50 °C and the drying method is azeotropic distillation with microwave drying. The average particle diameters of the powders were about 70 nm and the largest BET specific surface area was up to 669 m2•g?1. The compressive strength of the geopolymer and the calcium exchange capacity (by CaCO3) of NaA zeolite prepared with the powders reached to 29 MPa and 366 mg•g?1 respectively.

Key words: parameter optimization, Al2O3-2SiO2 nanopowder, sol-gel, geopolymer, zeolite

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