5 documents found, page 1 of 1
Stable cellulose-based carbon molecular sieve membranes with very high selectiv...
Tiago Araújo; Márcia Andrade; Gabriel Bernardo; Adélio MendesCarbon molecular sieve membranes (CMSMs) with a remarkable separation performance and stability were prepared from an ionic liquid regenerated cellulose precursor. Extremely high selectivities to H2 and CO2 are reported (H2/CH4 > 206 000 and CO2/CH4 > 14 600) due to the precise pore size of the produced membranes. Selectivity results >3590 are reported for the first time for the C3H6/C3H8 separation using cellu...
Propane selective carbon adsorbents from phenolic resin precursor
Márcia Andrade; Andrew Parnell; Gabriel Bernardo; Adélio MendesNovel carbon adsorbents for propane/propylene separation, with an unprecedented adsorption selectivity to propane - the minority component - were prepared from a phenolic resin precursor. The preparation conditions of the carbon molecular sieve adsorbents, such as pre-treatment with phosphoric acid, carbonization and posttreatment with propylene, were carefully investigated concerning their role on the separati...
Preparation of carbon molecular sieve membranes from an optimized ionic liquid-...
Sandra C. Rodrigues; Márcia Andrade; Jamie Moffat; Fernão D. Magalhães; Adélio MendesNovel carbon molecular sieve membranes with high separation performance and stability in the presence of humidified streams were prepared from an optimized ionic liquid-regenerated cellulose precursor, in a single carbonization step. Membranes prepared at two different carbonization end temperatures (550 degrees C and 600 degrees C) were analyzed through scanning electron microscopy, thermogravimetric analysis,...
Carbon Membranes with Extremely High Separation Factors and Stability
Sandra Rodrigues; Márcia Andrade; J. Moffat; Fernão D. Magalhães; Adélio MendesFor some time, carbon molecular sieve membranes (CMSMs) have been promoted as energy-efficient candidates for gas separation due to their high selectivity, permeability, and stability in chemically aggressive environments. Nevertheless, these membranes have not yet been made into commercial products due to a significant decrease in performance when exposed to humidity and/or oxygen. Herein, disruptive CMSMs wit...
Furanoate-based nanocomposites: A case study using poly(butylene 2,5-furanoate)...
Marina Matos; Andreia F. Sousa; Nuno H. C. S. Silva; Carmen S. R. Freire; Márcia Andrade; Adélio Mendes; Armando J. D. SilvestrePolyesters made from 2,5-furandicarboxylic acid (FDCA) have been in the spotlight due to their renewable origins, together with the promising thermal, mechanical, and/or barrier properties. Following the same trend, (nano) composite materials based on FDCA could also generate similar interest, especially because novel materials with enhanced or refined properties could be obtained. This paper presents a case st...