硅酸盐学报Issue(7)：867-874,8.DOI:10.14062/j.issn.0454-5648.2015.07.04
疏水性 HMS 分子筛的制备及水热稳定性
Preparation and Hydrothermal Stability of Hydrophobic HMS Molecular Sieve
摘要
Abstract
The hydrophobic HMS molecular sieve was prepared with trimethylchlorosilane and hexamethyldisilazane as silane agents by a vapor silylation method and a liquid silylation method. The effects of modification modes, reaction temperature and time, molar ratio of silane agents to HMS on the silylation were investigated. The framework character, microstructures and hydrophobic property, hydrothermal stability of HMS before and after modification were also analyzed. The results indicate that the gas phase method has some advantages such as its high efficiency and degree of silanization. The static water adsorption capacity of HMS before and after silanization are 45.38% and 1.38%, respectively, and the hydrophobic of HMS is enhanced under the optimal conditions (i.e., use of mixed silane agents, reaction temperature of 90 , reaction time of 8 h, and molar ratio of silane agents to HMS of 0.8). The℃hydrophobic HMS maintains the mesoporous structure and typical vermicular channel of HMS molecular sieve. Also, the hydrothermal stability of HMS is improved efficiently after modification, and the mesoporous structure is retained even after treatment by water vapor at 800℃ for 6 h.关键词
HMS 分子筛/硅烷化/改性/疏水性/水热稳定性Key words
HMS molecular sieve/silylation/modification/hydrophobicity/hydrothermal stability分类
化学化工引用本文复制引用
王广建,韩亚飞,褚衍佩,冯庆吉,王芳..疏水性 HMS 分子筛的制备及水热稳定性[J].硅酸盐学报,2015,(7):867-874,8.基金项目
国家自然科学基金项目(21276130)。 （21276130）
