物理化学学报 >> 2007, Vol. 23 >> Issue (09): 1463-1467.doi: 10.3866/PKU.WHXB20070930

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蔗糖在MCM-48表面的自发单层分散

陈军; 曾昌凤; 张利雄; 徐南平   

  1. 南京工业大学化学化工学院, 材料化学工程国家重点实验室, 南京 210009; 南京工业大学机械与动力工程学院, 南京 210009
  • 收稿日期:2007-03-20 修回日期:2007-05-14 发布日期:2007-09-06
  • 通讯作者: 张利雄 E-mail:mail4catalysis@yahoo.com.cn

Spontaneous Monolayer Dispersion of Sucrose on the Surface of MCM-48

CHEN Jun; ZENG Chang-Feng; ZHANG Li-Xiong; XU Nan-Ping   

  1. State Key Laboratory of Material-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, anjing University of Technology, Nanjing 210009, P. R. China; College of Mechanic and Power Engineering, Nanjing University of Technology, Nanjing 210009, P. R. China
  • Received:2007-03-20 Revised:2007-05-14 Published:2007-09-06
  • Contact: ZHANG Li-Xiong E-mail:mail4catalysis@yahoo.com.cn

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摘要： 采用液相浸渍法研究了蔗糖在中孔MCM-48表面的自发单层分散. 用X射线衍射(XRD)相定量分析法, 测定了蔗糖在MCM-48上的最大分散容量, 并用差热分析、N2吸附技术对制备的样品进行表征. 结果表明, 在蔗糖与MCM-48的质量比小于1.1时, 蔗糖在MCM-48表面能自发分散成单层. 当蔗糖/MCM-48 质量比为0.8时, MCM-48的比表面积由初始的998 m2·g-1降至114 m2·g-1, 孔径由原来的2.7 nm降至2.0 nm, 孔容由0.76 cm3·g-1降至0.11 cm3·g-1. 当蔗糖与MCM-48的质量比超过1.1时, MCM-48的比表面积迅速减小至10 m2·g-1以下. 这是因为蔗糖分子大小和MCM-48孔径相差不大, 导致蔗糖在MCM-48表面分散时出现孔道堵塞.

关键词: 蔗糖； 自发单层分散； MCM-48； 分散阈值

Abstract: The spontaneous monolayer dispersion of sucrose on the surface of MCM-48 by impregnation method was studied, and its monolayer dispersion capacity was determined by XRD quantitative phase analysis. The sucrose/MCM-48 samples were characterized by DTA and N2 adsorption. It was found that sucrose could readily monolayerly dispersed on MCM-48, with a monolayer dispersion capacity of 1.1 g sucrose/g MCM-48. When 0.8 g sucrose per g MCM-48 was dispersed on MCM-48, the specific surface area of MCM-48 was decreased from 998 m2·g-1 to 114 m2·g-1, with the decrease of the mean pore size from 2.7 nm to 2.0 nm. Further increase of sucrose amount more than the monolayer dispersion capacity resulted in the decrease of the specific surface area to less than 10 m2·g-1. This might be related to the limited difference between the pore size of MCM-48 and the molecular diameter of sucrose, which led to the blockage of the pores of MCM-48 at high sucrose amount.

Key words: Sucrose, Spontaneous monolayer dispersion, MCM-48, Monolayer dispersion capacity