Hierachical Zeolite-Zeolite Composite Prepared by a Vapor Phase Transport Method

doi:10.15541/jim20130667

Abstract

Abstract:

A zeolite-zeolite composite composed of Y and ZSM-5 was successfully prepared by a vapor phase transport (VPT) method. The as-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), N₂ adsorption-desorption and FT-IR. The results display that the synthesis is influenced by the Y content, preparing condition of dry gel and transfering condition for VPT method. FT-IR spectra show the characteristic peaks of MFI framework on ZSM-5 precursor after hydrothermal pre-treatment for 16 h. The result can be attributed to the crystal nucleus or microcrystal of ZSM-5 zeolite, either of which may promote growth of ZSM-5 crystals during the VPT procedure, and depresse formation of ZSM-35 crystals. The mesopores structure, created in as-synthesized zeolite-zeolite composite, can be ascribed to the extracted aluminum from Y zeolite crystals by VPT procedure.

Key words: vapor phase transport method, hierachical pores, zeolite-zeolite composite, ZSM-5, Y

CLC Number:

TQ426

ZHANG Qiu, Tan Wei, ZHENG Jia-Jun, ZHAO Qiang-Qiang, WANG Guang-Shuai, YI Yu-Ming, LI Rui-Feng. Hierachical Zeolite-Zeolite Composite Prepared by a Vapor Phase Transport Method[J]. Journal of Inorganic Materials, 2014, 29(9): 985-990.

Figures/Tables 7

Fig. 1 XRD patterns of the reference ZSM-5/Y-r (a), Y (b), ZSM-5 transferred from dry-gel without Y zeolite by the vapor phase transport method (c), as-synthesized zeolite-zeolite composite ZSM-5/Y (d), ZSM-5 precursor pre-treated hydrothermally for 16 h (e)

Fig. 2 FT-IR spectra of samples of ZSM-5/Y (a), ZSM-5 (b) and Y (c)

Fig. 3 SEM images of samples of pure ZSM-5 (a), pure Y (b) and ZSM-5/Y (c)

Fig. 4 N2adsorption-desorption isotherm of ZSM-5/Y, Y+ ZSM-5 and pore size distribution curve of ZSM-5/Y (inset)

Fig. 5 Effect of drying temperature (a) XRD patterns of zeolite-zeolite composite ZSM-5/Y transferred by a vapor phase method from dry-gel dried at different temperatures; (b) FT-IR spectra of dry-gel dried at (1) 60℃ and (2) 90℃

Fig. 6 XRD patterns of as-synthesized samples with different Y contents

Fig. 7 XRD patterns of zeolite-zeolite composite with different crystallizing time

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