物理化学学报 >> 2010, Vol. 26 >> Issue (12): 3257-3262.doi: 10.3866/PKU.WHXB20101140

催化和表面结构 上一篇    下一篇

Al MCM-41介孔分子筛的合成及表征

刘百军, 孟庆磊, 王辉, 孟庆民   

  1. 中国石油大学(北京), 中国石油天然气集团公司(CNPC)催化重点实验室, 北京102249
  • 收稿日期:2010-07-03 修回日期:2010-08-15 发布日期:2010-12-01
  • 通讯作者: 刘百军 E-mail:bjliu@cup.edu.cn
  • 基金资助:

    国家自然科学基金(20576077)资助项目

Synthesis and Characterization of Al MCM-41 Mesoporous Molecular Sieves

LIU Bai-Jun, MENG Qing-Lei, WANG Hui, MENG Qing-Min   

  1. Key Laboratory of Catalysis, China National Petroleum Corporation, China University of Petroleum, Beijing 102249, P. R. China
  • Received:2010-07-03 Revised:2010-08-15 Published:2010-12-01
  • Contact: LIU Bai-Jun E-mail:bjliu@cup.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20576077).

摘要:

以拟薄水铝石为铝源、水玻璃为硅源、十六烷基三甲基溴化铵为模板剂, 在110 ℃时水热晶化合成了含Al 的MCM-41 介孔分子筛. 采用X射线衍射(XRD)、N2吸附-脱附、固体29Si、27Al 魔角旋转核磁共振技术(MASNMR)、扫描电镜(SEM)及吡啶吸附傅里叶变换红外(FTIR)光谱技术对Al MCM-41 分子筛进行了表征. 结果表明: Al MCM-41 分子筛具有六方排列的孔道结构, 同时具有很高的相对结晶度、比表面积和孔容, 且孔分布单一; Al MCM-41分子筛中Si 原子在骨架内键合的程度更高, 使Al MCM-41分子筛具有更好的骨架晶化程度; 同时具有四配位骨架铝, 使Al MCM-41介孔分子筛具有适当的酸性.

关键词: 拟薄水铝石, Al MCM-41介孔分子筛, 魔角旋转核磁共振, 骨架铝, 酸性

Abstract:

Al MCM-41 mesoporous molecular sieves were synthesized by a hydrothermal method at 110 °C using the cationic surfactant cetyltrimethylammonium bromide as a template, sodium silicate as the silicon source, and pseudoboehmite as the aluminum source. The obtained Al MCM-41 molecular sieve was characterized by X-ray powder diffraction (XRD), N2 adsorption-desorption, solid-state 29Si, 27Al magic angle spinning nuclear magnetic resonance (MAS NMR), scanning electron microscopy (SEM), and pyridine adsorption in Fourier transform infrared (FTIR) spectroscopy. The results showed that the Al MCM-41 molecular sieves had an ordered hexagonal packed structure, high relative crystallinity, high BET surface area, large pore volume, and a narrow pore size distribution. Furthermore, strong bonding between the silicon atoms in the Al MCM-41 framework resulted in good crystallization. The presence of the four-coordinate aluminum in the framework resulted in higher acidity.

Key words: Pseudoboehmite, Al MCM-41 mesoporous molecular sieves, Magic angle spinning nuclear magnetic resonance, Framework aluminum, Acidity

MSC2000: 

  • O643