物理化学学报 >> 2010, Vol. 26 >> Issue (08): 2224-2228.doi: 10.3866/PKU.WHXB20100806

催化和表面结构 上一篇    下一篇

磷酸盐辅助一步合成介孔Beta分子筛

刘树萍, 岳明波, 王一萌   

  1. 上海市绿色化学与化工过程绿色化重点实验室, 华东师范大学化学系, 上海 200062
  • 收稿日期:2010-01-07 修回日期:2010-03-14 发布日期:2010-07-23
  • 通讯作者: 王一萌 E-mail:ymwang@chem.ecnu.edu.cn
  • 基金资助:

    国家自然科学基金(20873042, 20890122)资助项目

One-Step Synthesis of Mesoporous Beta Zeolite Using Phosphate

LIU Shu-Ping, YUE Ming-Bo, WANG Yi-Meng   

  1. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Chemistry Department, East China Normal University, Shanghai 200062, P. R. China
  • Received:2010-01-07 Revised:2010-03-14 Published:2010-07-23
  • Contact: WANG Yi-Meng E-mail:ymwang@chem.ecnu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20873042, 20890122).

摘要:

在合成纳米Beta分子筛的体系中添加磷酸二氢钠等无机盐, 通过一步晶化制备介孔Beta分子筛. 纳米分子筛组装形成的二次粒子克服了传统纳米粒子难以过滤分离的问题, 同时所形成的粒间介孔改善了分子在催化剂内的扩散从而提高催化反应效率. 采用X射线衍射、扫描电镜、氮吸附-脱附和氨程序升温脱附等表征方法对材料进行表征, 结果表明磷酸二氢钠的用量对介孔体积有很大影响. 当NaH2PO4/SiO2摩尔比为0.1时, 合成的材料具有较好的孔结构和酸性, 并在叔丁醇与苯酚的液相烷基化反应中表现出最好的催化活性.

关键词: 水热合成, Beta分子筛, 介孔, 烷基化, 磷酸盐

Abstract:

The addition of sodium phosphate monobasic (NaH2PO4) to a synthetic mixture allows a one-step synthesis of mesoporous Beta zeolite. Aggregation of the nanosized Beta zeolites allows the filtration difficulties to be overcome while the intercrystalline mesopores reduce the diffusion limitation and thus enhance the catalytic activity. The obtained Beta zeolite samples were characterized by X-ray diffraction, scanning electron microscopy, N2 adsorption-desorption, and temperature-programmed desorption of ammonia. The amount of phosphate strongly influenced the mesopore volume of the Beta zeolites. When the molar ratio of NaH2PO4/SiO2 was 0.1, the sample had good textural and acidic properties and exhibited the best catalytic activity for the alkylation of phenol with tert-butanol.

Key words: Hydrothermal synthesis, Beta zeolite, Mesoporous, Alkylation, Phosphate

MSC2000: 

  • O643.36