Preparation of high performance ZSM-5 zeolite membranes for CO2/H2 separation

S. Mirfendereski, T. Mazaheri
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引用次数: 8

Abstract

Abstract High-quality zeolite ZSM-5 zeolite membranes were successfully synthesized on the outer surface of tubular α-alumina substrates by manipulating the microstructure of the zeolite layer using a new different-sized seeding (DSSM) in combination with a variable-temperature/time (VTT) methods. In this method the defects/microcracks in the bottom seed layer, which are filled by smaller seeds, are effectively eliminated using a designed temperature/time profile, resulting in a significant increase in selectivity without scarifying permeance. The effects of number and combination of seed layers, seed particle size, and the synthesis temperature-time profile on the microstructure, N2/SF6 gas permeation, and H2/CO2 separation performance of membranes are evaluated in detail. The synthesized ZSM-5 zeolite membranes show the microstructure of thin, fully inter-grown, and densified zeolite layer that is responsible for high selectivity without any negative effect on the permeance. The best synthesized defect-free ZSM-5 zeolite membranes on alumina supports exhibited a very low H2/CO2 selectivity of 0.1 with CO2 permeance of 3 × 10−5 mol m−2 s−1 Pa−1.
ZSM-5型高效CO2/H2分离沸石膜的制备
摘要:采用新型不同尺寸的种子(DSSM)和变温/时间(VTT)方法对沸石层的微观结构进行调控,在管状α-氧化铝衬底表面成功合成了高质量的沸石ZSM-5沸石膜。在这种方法中,使用设计的温度/时间分布,可以有效地消除由较小种子填充的底层种子层中的缺陷/微裂纹,从而显著提高选择性,而不会破坏渗透。考察了种子层数和组合、种子粒径、合成温度-时间分布对膜的微观结构、N2/SF6气体渗透性和H2/CO2分离性能的影响。所合成的ZSM-5沸石膜具有较薄、完全互生、致密的沸石层结构,具有较高的选择性,且对渗透性能没有负面影响。在氧化铝载体上合成的最佳无缺陷ZSM-5沸石膜的H2/CO2选择性非常低,为0.1,CO2透过率为3 × 10−5 mol m−2 s−1 Pa−1。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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