Citation: WU Yun-Qin, ZHENG Lu-Kang, CHEN Qi, YU Meng-Ting, WANG Jin-Gui, ZHANG Fu-Min, XIAO Qiang, ZHU Wei-Dong. Fabrication of Zeolite Membranes Using Two-Dimensional Open-Pore MFI Nanosheets as Building Blocks[J]. Chinese Journal of Inorganic Chemistry, ;2019, 35(1): 89-94. doi: 10.11862/CJIC.2019.012 shu

Fabrication of Zeolite Membranes Using Two-Dimensional Open-Pore MFI Nanosheets as Building Blocks

1.
Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua, Zhejiang 321004, China
2.
School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology, Jinan 250353, China

Corresponding author: XIAO Qiang, xiaoq@zjnu.cn
Received Date: 3 September 2018
Revised Date: 12 November 2018

Figures(7)

Open-pore MFI zeolite nanosheets were prepared by removal of organic structure-directing agents (OSDA) from a multilamellar MFI zeolite (ML-MFI) using a mixture of 95%~98%(w/w) H₂SO₄ and 30%(w/w) H₂O₂ with V_H₂SO₄:V_H₂O₂=3:1 (known as piranha solution), followed by ultrasonication for exfoliation and sedimentation for purification. The exfoliated MFI zeolite nanosheets were characterized by various techniques, such as X-ray diffraction (XRD), scanning electron microscope (SEM), transmittance electron microscope (TEM), N₂ adsorption-desorption, Fourier transform infrared spectrometer (FT-IR) and thermal gravimetric analyzer (TGA), etc., indicating that OSDA was removed after the piranha solution treatment and dispersed, open-pore MFI nanosheets were obtained followed by exfoliation through ultrasonication. Continuous MFI nanosheet membranes were prepared by depositing the open-pore MFI nanosheets on home-made alumina disc supports by a simple vacuum-assisted filtration method. Single gas permeance tests on the MFI zeolite nanosheet membranes indicated that ideal selectivities for n-butane over i-butane of 4.1~5.8 with a permeance of n-butane of 2.2×10^-7~4.1×10^-7 mol·m^-2·s^-1·Pa^-1 were achieved.
- zeolites,
- membranes,
- nanostructures,
- nanosheets,
- piranha solution,
- isomer separation
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