M.C. Campo

Influence of Pyrolysis Parameters on the Performance of CMSM

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 with N2, He, and CO2. 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 of 750°C and the highest ideal selectivities for an end temperature of 700°C. In both cases, the membranes were quenched to room temperature

Characterization of membranes for energy and environmental applications

Abstract: Industrial use of membranes for gas separation has been increasing over the past two decades. The most common gas separations are oxygen enrichment from air, carbon dioxide separation and hydrogen purification. Membranes for gas separation can have various natures, namely polymer, ceramic (e.g. zeolite), metallic, carbon or mixed matrix. For their development and application it is necessary to characterize these membranes according to their surface and inner morphologies, surface chemistry, mass transport parameters and mechanical and chemical stability. This chapter presents the most common characterization techniques of polymer, ceramic, metal and carbon membranes, with regard to morphology and mass transport parameters. It also provides some phenomenological models normally used to describe the permeating mass transport.