Abstract
Carbon hollow fiber membranes have been prepared by pyrolysis of a P84/S-PEEK blend. Proximate analysis of the precursor was performed using thermogravimetry (TGA), and a carbon yield of approximately 40% can be obtained. This study aimed at understanding the influence of pyrolysis parameters—end temperature, quenching effect, and soaking time—on the membrane properties. Permeation experiments were performed withN2, He, andCO2. Scanning electron microscopy (SEM) has been done for all carbon hollow fibers. The highest permeances were obtained for the membrane submitted to an end temperature of750°Cand the highest ideal selectivities for an end temperature of700°C. In both cases, the membranes were quenched to room temperature.
Highlights
Carbon molecular sieve membranes (CMSMs), pioneered by Koresh and Soffer in the 80s, are a very recent research topic in the area of gas separation
The most important variable in this study is the yield of fixed carbon. This percentage accounts for the carbon content of the final carbon membrane
These results show that the membrane prepared with a 750◦C end temperature displays the highest permeance towards all the species studied
Summary
Carbon molecular sieve membranes (CMSMs), pioneered by Koresh and Soffer in the 80s, are a very recent research topic in the area of gas separation These inorganic materials present great advantages over polymeric membranes, since they have comparatively high permeabilities and selectivities, together with high thermal and chemical stability [1,2,3,4]. To further improve the separation capacity of CMSM, some authors have functionalized the carbon matrix by adding metals with affinity towards one of the permeating species [5] This strategy was followed by Barsema et al [6, 7]. A P84/SPEEK blend is used for the first time as a hollow fiber precursor for preparing carbon membranes and to study the influence of some of the pyrolysis parameters on the final performance. The hollow fiber configuration provides higher mechanical stability than flat sheet membranes
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