Al2O3-2SiO2 Nanoparticles with Defined Al-Si Ratio:Processing Optimization and Conversion

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

• MATERIALS AND PRODUCT ENGINEERING • Previous Articles Next Articles

Al₂O₃-2SiO₂ Nanoparticles with Defined Al-Si Ratio:Processing Optimization and Conversion

ZHENG Guangjian^1,2,3, CUI Xuemin¹, ZHANG Weipeng¹, TONG Zhangfa¹, LI Feng²

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 Revised:2011-08-02 Online:2012-05-02 Published:2012-04-28
Supported by:
Supported by the National Natural Science Foundation of China (50962002,50602006);Opening Funds of State Key Laboratory of Chemical Resource Engineering of Beijing University of Chemical Technology (201008)

Al₂O₃-2SiO₂ Nanoparticles with Defined Al-Si Ratio:Processing Optimization and Conversion

郑广俭^1,2,3, 崔学民¹, 张伟鹏¹, 童张法¹, 李峰²

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

通讯作者: TONG Zhangfa
基金资助:
Supported by the National Natural Science Foundation of China (50962002,50602006);Opening Funds of State Key Laboratory of Chemical Resource Engineering of Beijing University of Chemical Technology (201008)

Abstract

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 ℃ 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

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 ℃ 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

ZHENG Guangjian, CUI Xuemin, ZHANG Weipeng, TONG Zhangfa, LI Feng. Al₂O₃-2SiO₂ Nanoparticles with Defined Al-Si Ratio:Processing Optimization and Conversion[J]. , 2012, 20(2): 312-318.

郑广俭, 崔学民, 张伟鹏, 童张法, 李峰. Al₂O₃-2SiO₂ Nanoparticles with Defined Al-Si Ratio:Processing Optimization and Conversion[J]. , 2012, 20(2): 312-318.

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Al₂O₃-2SiO₂ Nanoparticles with Defined Al-Si Ratio:Processing Optimization and Conversion

Al₂O₃-2SiO₂ Nanoparticles with Defined Al-Si Ratio:Processing Optimization and Conversion

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