物理化学学报 >> 2016, Vol. 32 >> Issue (3): 745-752.doi: 10.3866/PKU.WHXB201512185

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核壳MFI/CHA分子筛的合成及催化性能

张玲1,2,王海彦1,2,*(),蒋忠祥2,王钰佳2   

  1. 1 中国石油大学(华东)化学化工学院, 山东青岛 266555
    2 辽宁石油化工大学化学化工与环境学部, 辽宁抚顺 113001
  • 收稿日期:2015-09-28 发布日期:2016-03-04
  • 通讯作者: 王海彦 E-mail:fswhy@126.com
  • 基金资助:
    辽宁省科技厅项目(201202126)

Synthesis and Catalytic Activity of Core-Shell MFI/CHA Zeolites

Ling ZHANG1,2,Hai-Yan WANG1,2,*(),Zhong-Xiang JIANG2,Yu-Jia WANG2   

  1. 1 College of Chemistry and Chemical Engineering, China University of Petroleum, Qingdao 266555, Shandong Province, P. R. China
    2 College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, Liaoning Province, P. R. China
  • Received:2015-09-28 Published:2016-03-04
  • Contact: Hai-Yan WANG E-mail:fswhy@126.com
  • Supported by:
    the Scientific and Technological Department of Liaoning Province, China(201202126)

摘要:

采用二次生长法(外延法)在ZSM-5(MFI型)晶体颗粒表面外延生长SAPO-34(CHA型)磷酸硅铝分子筛壳层,合成了MFI/CHA型核壳分子筛材料。并利用X射线衍射(XRD)、扫描电镜(SEM)、能量色散射线光谱(EDS)和傅里叶变换红外(FTIR)光谱对其进行了表征。结果表明,核相ZSM-5的预处理步骤对于成功合成此核壳型分子筛材料十分关键。通过研究晶化温度和晶化时间对MFI/CHA核壳型沸石分子筛合成的影响推测出MFI/CHA壳层生长的晶化机理,并考察在甲醇芳构化中的择形催化作用。

关键词: MFI/CHA, 核壳结构, 水热晶化, 外延生长

Abstract:

MFI/CHA core-shell zeolites were synthesized by a two-step hydrothermal synthesis strategy (epitaxial growth). The growth of silicoaluminophosphate SAPO-34 fabricates crystalline layers over ZSM-5 nanocrystal crystallites. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectrometry (EDS), and Fourier transform infrared (FTIR) spectroscopy. The analyses indicate that the pretreatment step of the core phase was an important step during the synthesis. The growth kinetics of the MFI/CHAcore-shell zeolites were investigated by analyzing the products obtained with different secondary crystallization times and temperatures. The core-shell zeolite shows good shape-selective catalytic performance for converting methanol to aromatic compounds.

Key words: MFI/CHA, Core-shell structure, Hydrothermal crystallization, Epitaxial growth

MSC2000: 

  • O647