Boehmite-Phenolic Resin Carbon Molecular Sieve Membranes – Permeation and Adsorption Studies

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Miguel Teixeira (Author) FEUP; Sandra C.Rodrigues (Author) FEUP; Marta Campo (Author) FEUP; David A. Pacheco Tanaka (Author) FEUP; Margot A. Llosa Tanco (Author) FEUP; Luís M. Madeira (Author) FEUP; José M. Sousa (Author) FEUP; Adélio Mendes (Author) FEUP

Journal

Title: Chemical Engineering Research and Design

Vol. 92 No. 11

Pages: 2668-2680

ISSN: 0263-8762

Publisher: Institute of Chemical Engineers

Indexing

ISI Web of Knowledge - 14 Citations

ISI Web of Science

Scopus - 33 Citations

INSPEC

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Technological sciences > Engineering > Chemical engineering

Associated Projects

PTDC/EQU-EQU/114944/2009 - Desenvolvimento de um sistema autorregenerativo para a remoção de CO2 de sistemas anestésicos em circuito fechado

Other information

Authenticus ID: P-00A-0DP

DOI: 10.1016/j.cherd.2013.12.028

Abstract (EN): Composite carbon molecular sieve membranes (c-CMSM) were prepared in a single dipping–drying–carbonization step from phenolic resin solutions (12.5–15 wt.%) loaded with boehmite nanoparticles (0.5–1.2 wt.%). A carbon matrix with well-dispersed Al2O3 nanowires was formed from the decomposition of the resin and dehydroxylation of boehmite. The effect of the carbon/Al2O3 ratio on the porous structure of the c-CMSM was accessed based on the pore size distribution and gas permeation toward N2, O2, CO2, He, H2, C3H6 and C3H8. c-CMSM with higher carbon/Al2O3 ratios had a more open porous structure, exhibiting higher permeabilities and lower permselectivities. c-CMSM performance was above the upper bound curves for polymeric membranes for several gas pairs, particularly for C3H6/C3H8 (permeability toward C3H6 of 420 barrer and permselectivity of 18.1 for a c-CMSM with carbon/Al2O3 ratio of 4.4). Unsupported films were also prepared (carbon/Al2O3 ratio 7.3) and crushed into small flakes. Equilibrium isotherms of H2, N2, O2, CO2, C3H8 and C3H6 at 293 K were determined on these flakes to obtain the kinetic and adsorption selectivities toward gas pairs of interest; obtained adsorption and diffusion coefficients accurately predicted the permeabilities of all studied gases except CO2 (experimental and predicted permeabilities of 1148 and 154 barrer, respectively).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13