Synthesis, Characterization and Gas Separation Properties of MOF-5 Mixed Matrix Membranes

Abstract

With the rapid development of hydrogen economy and membrane science, membrane-based gas separation technology shows great potential for the hydrogen purification. Mixed matrix membranes (MMM) have been developed in order to increase the gas separation performance of a membrane. However, MMMs result in poor filler-polymer compabilities and filler segregation. Metal organic frameworks (MOFs) as new fillers with high surface area and pore volume overcome these drawbacks and enhance the H₂ gas adsorption properties. In this study, MOF- 5 was synthesized, characterized and incorporated into polyimide (PI) to investigate the effect of filler on the single gas permeation. MOF-5/PI MMMs were fabricated at different loading rates (5wt.%, 10wt.%, 15wt.% MOF-5). The characterization a membrane was performed by scanning electron microscopy (SEM), infrared spectroscopy (IR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The prepared  membranes with varying filller contents were used to investigate the H₂, CO₂ and CH₄ permeation properties and H₂/CO₂, CO₂/CH₄, H₂/CH₄ selectivities. The results showed that the single gas permeation experiments for all gases increased with MOF-5 loading at room temperature and pressure of 200 kPa. At higher loadings, ideal selectivity of H₂/CO₂, CO₂/CH₄, H₂/CH₄  were found less compared to the pure polymer. Consequently, the incorparation of MOF-5 into the polimer  incresed the membrane gas permeation rates but decreased the selectivity.

Keywords

• Metal organic framework,Polymer,Mixed matrix membrane,Permeability,Selectivity

MOF-5 Bağlı Karışık Matriksli Membranların Sentezi, Karakterizasyonu ve Gaz Ayırma Özellikleri

Abstract

Membran biliminin ve hidrojen ekonomisinin hızlı gelişimi ile hidrojen saflaştırmada membrane dayalı ayırma teknolojisi yüksek bir potansiyel göstermektedir. Gaz ayırma membranlarının performansını arttırmak için karışık matrisli membranlar (MMM) geliştirilmiştir. Fakat, MMM’lar, zayıf dolgu-polimer etkileşimine ve dolgu malzemesinin topaklanmasına neden olmaktadır. Yüksek yüzey alanı ve por hacmine sahip yeni bir dolgu malzemesi olan metal organik kafes sistemi (MOF) bu olumsuzlukarın üstesinden gelmekte ve H₂ gas adsoprsiyon özellikleini iyileştirmektedir. Bu çalışmada, MOF-5 sentezlenerek, bu yapının karakteristik özellikleri incelenmiştir. Gaz geçirgenliği üzerinde dolgu maddesinin etkisini incelemek üzere, farklı yükleme oranlarında (0, %5, %10, %15) hazırlanan MOF-5 kristalleri poliimit membrane içine ilave edilmiştir. Karakterizasyonları, taramalı electron mikroskobu (SEM), kızık ötesi spektrometresi (IR), x ışını kırınım cihazı (XRD), termogravimetrik analiz (TGA) ile tayin edilmiştir. Farklı oranlarda hazırlanan membranlar, H₂, CO₂ ve CH₄ gazlarının geçirgenlikleri ile H₂/CO₂, CO₂/CH₄ ve H₂/CH₄ seçiciliklerini belirlemek üzere kullanılmıştır. Tüm gazlarda geçirgenlik 200 kPa ve oda sıcaklığında artış göstermiş fakat  yükleme oranı arttıkça H₂/CO₂, CO₂/CH₄ ve H₂/CH₄ seçicilikleri saf polimere gore azalmıştır. Sonuç olarak, polimere MOF-5’in ilavesi geçirgenlik performansını arttırmasına rağmen, seçicilik azalma göstermiştir.

Keywords

• Metal organik kafes,Polimer,Karışık matrisli membran,Geçirgenlik,Seçicilik

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