催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (12): 1247-1252.

• 研究论文 • 上一篇    下一篇

ZSM-5/Silicalite-1核壳分子筛含氟水热体系的合成及表征

童伟益1,孔德金1,2,3,刘志成2,郭杨龙1,房鼎业3   

  1. 1 结构可控先进功能材料及其制备教育部重点实验室, 华东理工大学工业催化研究所, 上海 200237; 2 中国石油化工股份有限公司上海石油化工研究院, 上海 201208; 3 华东理工大学化工学院, 化学工程国家重点实验室, 上海 200237
  • 收稿日期:2008-12-25 出版日期:2008-12-25 发布日期:2012-09-20

Synthesis and Characterization of ZSM-5/Silicalite-1 Core-Shell Zeolite with a Fluoride-Containing Hydrothermal System

TONG Weiyi1, KONG Dejin1,2,3*, LIU Zhicheng2, GUO Yanglong1*, FANG Dingye3   

  1. 1 Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, China; 2 Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China; 3 State Key Laboratory of Chemical Engineering, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2008-12-25 Online:2008-12-25 Published:2012-09-20

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摘要： 以圆柱形ZSM-5为核,用柠檬酸对其外表面进行预处理后,在含氟壳层晶化体系中二次生长合成核壳分子筛. 通过X射线衍射、扫描电镜、透射电镜、N2吸附及氨程序升温脱附对分子筛进行了表征,并以甲苯歧化和1,3,5-三甲苯裂化为探针反应对分子筛性能进行了考察. 结果显示,产物是以ZSM-5为核、silicalite-1纳米晶为壳的两相复合微孔分子筛材料; 在含氟体系中ZSM-5外延生长出了致密壳层; 全硅壳层的覆盖度约达到97%, 核壳分子筛的外表面酸位随之减少,但基本保持孔道内的酸性.

关键词: 核壳, ZSM-5, silicalite-1, 外延共生, 二次生长, 氟化物

Abstract: By using ZSM-5 as the core material, which was pretreated with 25% citric acid and then calcined, ZSM-5/Silicalite-1 micro-composites with core-shell struc ture was hydrothermally synthesized in a fluoride-containing system. The compac t silicalite-1 shell reaches 97% coverage on the surface of the core ZSM-5 aft er the secondary intergrown. The product has a decreased surface acidity and a p reservation of the original inside channel acidity.

Key words: core-shell, ZSM-5, silicalite-1, intergrowth, secondary growth, fluoride