Acta Chimica Sinica ›› 2004, Vol. 62 ›› Issue (14): 1357-1361. Previous Articles     Next Articles

MFI沸石前驱体和硅酸钠共组装制备水热稳定的管状介孔分子筛

郑均林, 张晔, 吴东, 孙予罕   

  1. 中国科学院山西煤炭化学研究所, 煤转化国家重点实验室, 太原, 030001
  • 投稿日期:2003-04-21 修回日期:2004-03-31 发布日期:2014-02-17
  • 通讯作者: 孙予罕,E-mail:yhsun@sxicc.ac.cn E-mail:yhsun@sxicc.ac.cn
  • 基金资助:
    国家重点基础研究专项经费(No.G2000048001)、国家重点自然科学基金(No.29973057)和山西省自然科学基金(No.991023)资助项目.

Synthesis of Hydrothermally Stable Mesoporous Aluminosilicates with Tubular Morphology from MFI Zeolitic Precursors and Sodium Silicates

ZHENG Jun-Lin, ZHANG Ye, WU Dong, SUN Yu-Han   

  1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001
  • Received:2003-04-21 Revised:2004-03-31 Published:2014-02-17

Hydrothermally stable mesoporous aluminosilicates with hollow tubular morphology and hexagonal nanochannels were prepared through co-assembly of sodium silicates, sodium aluminates and MFI aluminosilicate precursors.The XRD results indicated that the synthesized materials were well-ordered hexagonal mesostructures of MCM-41 type.The highly regular hexagonal mesostructures could survive 150 h age in boiling water, exhibiting good hydrothermal stability.Combining the SEM and TEM investigations, the as-made materials showed hollow tubular morphology with mean diameter of 0.30 μm and average length of 2.0 μm.MFI aluminosilicate precursors as precursor (I) enhanced the hydrothermal stability without compromising the ability to tailor the second-order structure.Sodium silicates donating soluble silica species as precursor (II) made the assembly system strongly alkaline, and hollow tubular morphology of mesoporous aluminosilicates evolved after the pH value of the mixture was adjusted to 10 by adding proper amount of H2SO4.Under the direction of CTAB template, these two different precursors cooperated with each other and condensed together in the assembly process.Combining the properties of good hydrothermal stability, tubular morphology and high surface areas, these mesostructured materials can find potential applications in catalysis, separation and optic electronics.

Key words: mesoporous aluminosilicate, hydrothermal stability, morphology tailoring, tubule, protozeolitic nanoclusters