Preparation of Zeolite X Membranes on Porous Ceramic Substrates with Zeolite Seeds |
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Authors: | Zhongqiang Xu Qingling Chen Guanzhong Lu |
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Institution: | 1. Shanghai Research Institute of Petrochemical Technology, Shanghai 201208, China |
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Abstract: | Zeolite X membranes were investigated by in-situ hydrothermal synthesis on porous ceramic
tubes precoated with zeolite X seeds or precursor amorphous aluminosilicate, and porous a-Al2O3 ceramic
tubes with a pore size of 50-200 nm were employed as supports. Zeolite X crystals were synthesized by
the classic method and mixed into deionized water as a slurry with a concentration of 0.2-0.5wt%, having
a range of crystal sizes from 0.2 to 2 um. Crystal seeds were pressed into the pores near the inner surface
of the ceramic tubes, and crystallization took place at 95oC for 24-96 h. It was also investigated that
Boehmite sol added with zeolite X seeds was precoated on ceramic supports to form a layer of
r-Al2O3
by heating, and hydrothermal crystallization could then take place to prepare the zeolite membranes on
the composite ceramic tubes. The crystal species were characterized by XRD, and the morphology of
the supports subjected to crystallization was characterized by SEM. The composite zeolite membranes
have zeolitic top-layers with a thickness of 10-25 um, and zeolite crystals can be intruded into pores of
the supports as deeply as 100 um. The experimental results indicate that the precoating of zeolitic seeds
on supports is beneficial to crystallization by shortening the synthesis time and improving the membrane
strength. The resulting zeolite X membrane shows permselectivity to tri-n-butylamine((C4H9)3N) over
per
uro-tributyl-amine ((C4F9)3N), and a permeance ratio of 57 for ((C4H9)3N to (C4F9)3N could be
reached at 350oC Permeances of BZ, EB and TIPB through the zeolite membrane were also measured
and were found to slightly increase with temperature. |
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Keywords: | inorganic ceramic membrane zeolitic membrane membrane preparation and characterization membrane separation |
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